CA2189119A1 - Method and arrangement for call setup in telecommunication networks using signaling aided redialing - Google Patents

Abstract

In a communication system a method and means for signaling-supported-redialing whereby a traffic connection between a calling and a called subscriber is set up by first making a preparatory data-only call in order to get, via machine-readable inband signaling, alternative telephone numbers to terminals available to the called subscriber and after that going on-hook to terminate the preparatory data-only call and going off-hook again to make a new call for the actual traffic, redialing one of the numbers just received from the called subscriber.

Description

~ WO 95/3332~i 2 1 8 9 1 1 9 ~T~OD aND T ~ POR CALL 8ETIJP IN TPT.-- r~
8ING ~IA"~T AIDE:D U~nT~T
FIEI,D OF T~ l~ ~_ The present invention relate6 to the setting up of calls in 5 and between ~ ation ne; LhS. More particularly, the present invention is directed to a method and apparatus for setting up at least one connection in at least one network for ;rAtion between a calling and a called subscriber.
pr~ OF T1~8 ln~
10 First some remarks about the used te~ninnlogy. "Call forwarding" is a feature under control of the called subscri-ber pB (the person B). Call forwarding means that if the called subscriber pB wants to receive calls over a to~n;nAl C
different from the usual one he/she instructs the network 15 accordingly and pB pays for the additional cost. As opposed to this, '~ro~li Al ;nq~ means terminating a fir6t call by going on-hook and then going off-hook again and L- p~LroL~ing dialing using a new number for dialing. r ~; l ;ng is under control of the calling subscriber pA (the person A) and pA profits from 20 any cost saving or pays for any additional cost resulting from the rO~liAl ;ng. "Call redirecting" is used in the present text as a common designation for changes in call routing, indepen-dently of whether the ro~pr.n~;hle actor is the calling pA or the called pB subscriber.
25 It is the aim of modern tele: ; cation to provide universal mobility, i.e. to make it possible for roaming subscribers to ; o ~te with each other from zmd to to~m;nAls in virtually any n~:L~.JLhD. A simple type of mobility has been provided for a long time through call forwarding 30 features in wir~ buu..d and mobile radio tele ;cAtion n~ t~sC~LhD~ allowing calls to be received on an alternative tP~m;n:-~l . More advanced mobility, but restricted to a certain Wo95/33326 r~l,~
21891l~ 2 area, has been provided by cellular radio systems, allowing calls to be received over a mobile radio tPrm;n~l carried by the called subscriber. "Global" mobility has been described in the international published application WO94/05129, 5 allowing in principle calls to be received in any mobile radio network all over the world.
However subscribers want to have even better mobility not only geographically but also between nc L~.J~ k~ and easily select between terminAl s available e.g. cellular radio 0 tPrm;n~ Wil- b~U~dtprm;nAlc~ personalcomputers, etc. for special ~ ;ration needs and/or to m;n;~i~e cost.
_g_Kll . OF R13~a~rEO ART
To alternate between ne~.JLks it is nPcpsc~ry to be able to redirect i- ;ng calls to wanted tPnm;n~lc. Figures 1-3 15 illustrate some known examples of forwarding ;r ;n-J calls rrom a mobile radio tPrm;n~l to a WiLe b~ul~d telephone whereas figure 4 illustrates a known example of signaling the tDrm;nAl 8 number to a tPrm;n~l A in an Integrated Services Digital Network ISDN.
20 Call forwarding is defined as redirecting a call at set up of the call under control of the called subscriber pB to a 80-called C-tDrm;nAl rather than receiving the call on the B-tPrm;n~l ~rec;f;P~ by the calling subscriber pA through dial ing .
25 In figure 1, a wlred network PSTN, public switched tele-phone network 107, is shown together with a cellular radio network consisting of two mobile services switching centres NSCl 108 and NSC2 105 and a home location register HLK 106 c~nnPctecl to NSCl and MSC2. A calling subscriber pA (not 30 shown) uses a ~Plerh-nP A 101 to dial the tPlPrh~nP number of a called s~lhcrr;hPr pB (not shown) having a mobile radio tPrm;n~l B 102. The connection is via line 111 to the public switched telephone network PSTN 107 and via line 112 to the mobile services switching centre MSCl 108. Alternatively, a ~ WO g5l33326 2 1 8 9 1 1 q r~ h~

mobile radio term;nAl (A) 104 and a radio channel 116 may be used by the calling subscriber pA instead of the wire-bound t~rm;n~l 101. MSCl sends the dialed ~ ~ -r via signaling connection 113 to the home location register HLR 106 and 5 receives from HLR 106 a roaming number allowing routing to the mobile radio t~rm;n~l B 102 via the PSTN 107, connections 114, 115, a mobile services switching centre MSC2 105 and a radio channel 117. The mobile radio ~ m;n:-l 102 has earlier registered itself as being in the area of NSC2 105, where~y the signaling connection 110 was used by NSC2 for the regi-stration and for receiving and storing in NSC2 a so-called C-number to which to forward ir- ;nq calls when the f~rm;nAl 102 is busy or does not reply within a specif;r- time. If we now assume that the terminAl B is actually busy when the de6cribed call arrives to MSC2 105, the call will be redirected to the WiL~ bvu--d t~l-min~l C 103 via PSTN 107 and cnnn~ctionC 118, 119, as indicated by the switch 120 in MSC2 105. One disad-vantage for the calling subscriber in this situation is that he/she usually pays the higher cellular rate inspite of the fact that the actually u~ed C-t~rm;nll 103 is wir~ b~ul~d.
In f igure 2 a wired network is shown togeth-~r with a cellular radlo network slightly different from the cellular network of figure 1. A calling subscriber pA (not shown) uses a telephone A 201 to dial the t~lerhnne number of a called subscriber pB (not shown) having a mobile radio term;n~l 8 202. The connection is via line 211 to the public switched telephone network PSTN 207 and via line 212 to the mobile services switching centre NSCl 208. Alternatively, a mobile radio t~rm;n~l (A) 204 and a radio channel 216 may be used by the calling subscriber pA instead of the WiL~ b~UI~'l t~rm;n~l 201. MSCl 208 sends the dialed B-number via signaling connec-tion 213 to the home location register HIR 206 and receives from HLR 206 a roaming number allowing routing to the mobile radio t~rm;n~l B 202 via the PSTN 207, connections 214, 215, a mobile services switching centre NSC2 205 and a radio channel 217. The mobile radio tF~ n~l 202 has earlier W095133326 21 891 19 r~ h~
registered itself as being in the area of MSC2 205, whereby the signaling connection 210 was used by IISC2 for the regi-stration in H~R 206 but no C-number was sent from HLR 206 to MSC2 205. If we now assume that the t~minAl B is actually 5 busy when the described call arrives to NSC2 205, the status signal "busy" will be signaled back from MSC2 205 over PSTN
207 and the connections 215, 214 to NSCl 208. MSCl 208 requests and receives the C-number from HLR 206 via si~nAl in~
conn~r~inn 213 and then MSCl 208 redirects the call to the 10 WiL~ buu~-d t~rminAl C 2û3 via PSTN 2û7 and connections 218, 219, as indicated by the switch 220 in NSCl 208. The dif-ference between the case of figure 1 and the case illustrated in figure 2 is that in the case of figure 2 the C-number is kept stored in HLR 206 and provided to MSC1 on request rather 15 than being transferred to and stored in BC2 205 during registration of the called mobile radio t~minAl.
In figure 3 a wired network PSTN is shown together with a cellular radio network and an electronic Se~L~:~dLy ES 309 which is e.g. a small tc-l ~ i ~r~A~tion switch. A calling 20 subscriber pA (not shown) uses a telephone A 301 to dial the telephone number of a called subscriber p8 ~not shown) having an electronic secretary ES 309 . me ~onn~rtior is via line 311 to the public switched t~l~rhnn~ network PSTN 307 and via line 312, the electronic secretary ES 309, lines 314, 315 and 25 PSTN 307 to the mobile services switching centre MSC2 305 and via radio rnnnor~1nn 317 to the mobile radio ~tm;nAl B 302 or to the wi~ b~,ul-d t~-minAl C 303. Alternatively, a mobile radiotPrminAl (A) 304 and a radio channel 316 may be used by the calling subscriber pA instead of the wi~ b-,u..d t~rmin~l 30 301. MSCl 308 does not need to consult HLR 306 because the dialed number is the t~l r~hnnD catalog number of the elec-tronic secretary ES 309 and MSCl therefore routes the call via connetion 313 to the PSTN 307 and further (not shown) to ES
309. ES 309 knows from earlier registering messages received 35 from its owner that the owner is presently r~Arh~Ahle via his/her mobile radio t~rminAl and therefore routes the ~ W095/33326 21 8q 1 ~ ~ r~"~

cnnnoct;on to tPrminAl B 302 via the connections 314, 315, PSTN 307, NSC2 305 and radio connection 317, whereby it has been assumed that ES 309 and torminAl B are both in the area of NSC2 305. The 6ignAl ing connection 310 has been used 5 earlier by the tormln~l B 302 for registering in HLR 306 indicating its present location in the area of NSC2 305. The difference to the case illustrated in figure 2 is that in the case of figure 3 the C-number is kept stored in the ES 309 and not in an HLR and that all calls to torminAl B 302 are first 10 routed to the ES 309. If we now assume that the tormin~l B 302 is actually busy when the ~escribed call arrives to NSC2 305, the status signal "busy" will be signaled back over PSTN 307 and the c~nnoct~-~n~ 315, 314 to the ES 309 and in the ES the call will be redirected to the wire-bound to~minAl C 303 via 15 PSTN 307 and cr~nno~-tions 318, 319, as indicated by the switch 320 in ES 309. One disadvantage of using an electronic secretary ES is the fact that ES is associated with the called subscriber and substancial detour routing, in the US called L, ~ ~ i n~J~ may result from the moving about of tr~ni nAl B 302 20 since all calls have to go f irst to ES 309 i nrlPrQn~ontl y of the location of the calling party A.
Figure 4 illustrates related art known from an Integrated Services Digital Network ISDN. In particular, reference is made to the "C . ~L~cl Line T~ nt~fi~ ~tion P.~s~ .,Lation 25 (COLP) supplementary service" irl~;uL~.Le.ted in the "Integrated Services digital network User Part tISUP) protocol" of the Signaling system No.7, described by the EUL~ al~ Telecom-munications SLand~-~ds InstitUte (ETSI). Said COLP service is a service a user may subscribe to in order to automatically be S0 informed on the telephone number of a called subscriber when originating a call to said called subscriber. When the user makes a call from his/her t~rminAl A 401 via the digital line 404, the ISDN 403 and the digital line 405 to the torminAl B
402 the tr~nminAl 402 automatically transfers back to the 35 to~ninAl A by digital system No.7 signaling, the tolorhr~no number of torr~ nAl B 402 . This telephone number may be the number of a fax-t~rmin~l or similar nnd the calling party may be interested in rh~~kin~ that the answering t~rmin~l actually i8 the intended one before sending information which may be confidential. One diYalv~ e of this ISDN feature is the 5 fact that the ;~-~ting t~m;n~lR must be ISDN t~rmin~lc connected to the ISDN (digital) network.
The limitations and disa-lv,~ .g. s of the described related art are /liRc~llcR~tl further in the following.
Within a cellular network, although in older systems the 10 forwarding point was chosen in the MSC visited by the B-subscriber (MSC2) as sho-wn in fig. 1, the forwarding point of more modern cellular systems has been located in the gateway MSC, i.e. MSC1 near the A-subscriber as shown in fig. 2. This latter method reduces the detour routing ("L~, -") of the 15 transmission path when forwarding. But this method is limited to the ~ cellular network and does not eliminate the detour routing caused by forwarding calls between different n~L~.uLh~ as e.g. if a call from the public switched t~l~rh~n~
network PSTN in France to a cellular subscriber of the Nordic 20 Mobile Telephone tNMT) mobile radio network in ~c~n~in~via is foLw.,~.led in a mobile services switching centre MSC in S~-~n~l; n~via back to France where the called sub6criber is located at the time. Also, the more expensive cellular rates are charged to the calling subscriber when forwarding a call 25 from cell~lAr to WiL-_ b.,..,-d ~rm;n~
In a network as shown in f ig . 3 serving subscribers with more ~.lv~ d requirements, the forwarding point has sometimes been located in a 11 _ ~ iber owned trrm;n~l, such as in the ca6e of the "electronic 6e-;~et~-.y" described in the inter-30 national application (PCT/SE93/00078). ~his gives the calledsubscribers the possibility of call forwarding between different n~l wu h:- and paying for cellular only when using cellular, but detour routing is still not avoided because the location of the electronic secretary ES is f ixed and not at 35 all associated with the calling subscriber and his/her location .

~ W095133326 21 891 ~ 9 r~ h~

The COLP function shown in fig. 4 automatically transmits the B-tPrmin~l num~er to the A-torm;n~1 and presents it to the user of the A-tPrm;n~l, thereby Pn;~hl ;n~J said calling user to check if the rP':rnn~in~ tPrmin:~l i8 the intended one. But this 5 feature uses functions such as screening and modifying transferred numbers in the PY~h~n~Pe of the ISDN network and is not generally ~rpl i c~hl e outside the ISDN network or betwee~ n~L~.~,Lh~ because of the special digital No.7 sig-naling .
lo Further to the related art of call forwarding and tPrminAl B number e i~n~ 1 i n~ described in f igures 1-4 there is the following known method of rP~ l ing (no figure): If a calling subscriber pA dials a called subscriber pB using pB's home telephone number there may be a tolPrh~nP answering machine 15 informing the calling subscriber pA by a voice message that the user pB is not at home but may be reached over another specif;ed telephone number C. The subscriber pA then may go on-hook and off-hook again, redial using the specified C
number and succeed to ~ i c~te with the subscriber pB. This 20 method is applicable to all neL.~J~h~ but is too time cnn~lming to be used extensively.
Further to the above described related ~rt regarding redirecting it should be mentioned for the u~ L,Inding of the invention that it is known from US application 07/936,273 2S to use a barcode reader to read a tolorh~no number of a nearby Wil~ bvu--~ tp]erhr~no set from a bar code lable and to store this number in a cP11~ r radio torm~n~1. An even simpler alternative method would be desirable.
8~a~Y oY T}ll~ ~n~
30 A problem with the described related art is that call forwarding in many case6 causes detour routing, in the US
called tL~ in~, over a distant forwarding point, rather than routing directly between the calling tormin~l A and the tPr~;n ll C to which the call is to be forwarded, fig. 1-3.

Wo 95/33326 2 1 8 9 1 1 9 This may be associated with ~ ~c~cs~ry cost for both the calling and the called subscribers.
Another problem with the described related art is that providing voice information from a telephone answering device 5 to a caller and manual redialing by the caller as described above is aukward and slow because AQr~n~in~ on spoken mes-sages, although it does eliminate L~ ~ in~.
Another problem is that the digital data l::iqnAl ln~ of fig.4 is limited to the ISDN network and not generally applicable 10 over different networks.
Another problem is that infor_ation regarding called subscribers is usually stored in a home location register HLR
or in a telephone answering device which are at fixed loca-tions and it would be very time cnn~llmin~ to cont;n~nuly 15 update these stores on what t~rminAl~ are currently available to a subscriber who is moving around.
Another problem with the described related art is that storing the addr~sses of the alternative ~rm;nA1~ C in the called subscriber's mobile radio ~rmin~l B is still too time 20 cnnF~ming to encuuLc-~e subscribers to use these methods as e.g. described in US application 07/936,273 mentioned hereinabove. In particular, a subscriber carrying a c~ Ar mobile radio t~rminAl would prefer, at least when arriving at work or at home to have a simple way for storing or activating 25 a ~r~LuL- d address of his/her nearby WiL. buu-,~ t~rminAl in his/her h~nAhF-ld.
Another problem with the described related art i8 that call forwarding is under the exclusive control of the called subscriber while rPA;Al in~ is under the exclusive control of 30 the calling subscriber.
It iB an object of the present invention to make it po~ihl-~for users of I;c~tion n.:~.orl~L to eliminate L~, in~
comprising one or several paths in t~l ~ ; rAtion networks if calling and called subscriber agree to such elimination.
35 It is a further object of the present invention to make it possible for users of telec ; cation networks to select the ~ W0 95~33326 2 1 8 9 1 1 9 r~ h~r ~c ~

most cost-effective network or nel JLl.S and ~n;n~lq ~vailable at the time.
It is a further object of the invention to store and make use of information about alternative t~l-minAl~ available to 5 a called subscriber with a minimum of actions by that sub-scriber .
The present invention solves these problems by allowing both the called subscriber pB, i . e. the person pB and the calling subscriber pA, i.e. the person pA to participate in 10 the redirecting of calls, i.e. to participate in the selecting of the tP~m;nAl to be used by the called su~scriber pB and in selecting the routing of a traffic r~nn~cti-~n between the calling subscriber pA and the called subscriber pB. According to the present invention a method and apparatus is provided 15 where firstly, a redirecting point is provided which is under control of the calling subscriber pA, i.e. in the f~rm;nAl A
itself, or in an AC~CPC~ LY for the tPrm;nAl A, or in a service node near pA, e.g. a PABX under the control of tP~m;nAl A; and where secondly poqq;hle forwarding addLasses, so called 20 tP~min~l C ad-lLas~es, are received in said redirecting point durlng a very short preparatory call which ~ cds the ~ctual traffic call; and thirdly, said tQ~m;nAl C adlL~ are analysed in said redirecting point and if indicated from the subscriber pA' s point of view e.g. available as prestored 25 instructions from pA, r~ l ;n~ is pe~ from said redirecting point using one of said tPrm;nAl C addLac~ . The an~lysing and rp~ n J may be fully Autom~tic or involve human participation from the calling subscriber pA. The ~ignAl ;n~ used with this ploc~duLe is preferably p_Lr~ ' via 30 in-band signAl ~n~, e.g. dual tone multi rL~yu~ ;y M~MF or rL~oyUe~ shift keying modulation ~5~1, whereby at least one tP~n;n~l C number is transmitted over at least one network to the redirecting point. Redialing is performed if indicated by analysing said at least one tPnm;n~l C number and the origi-35 nally dialed number, either using a prP~l~tprminpd algorithm,or using human controlled selection in real time by the W095133326 21 891 1 9 r~

calling subscriber pA, of a tPrminAl C number received and shown on a display of the tPrminAl A. The subscriber pB
participates in the process by providing the tP~m;n~l C
address (es) acceptable to him/her and sending them prefer~bly 5 in-band to the redirecting point which redirecting point is under control of the calling subscriber pA.
According to another aspect of the present invention the problem of providing the telephone number of a subscriber ' s Wil~ buul.d telephone at home or at work when the called 10 subscriber is at home or at work respectively, is solved by connP~t;nq an ,A.~v~55v~y to the line of the wir~ b~ul~d tele-phones PnAhl; n~ registering of the telephone number of the associated WiL~ b~ul~ telephone in the hAn~lhPlcl radio mobile tP~m;"Al while also charging the battery of the hAn~lhPld.
15 Storing is performed when the h~mlhPl~i i5 inserted into said charging Acc~s~,Ly, either by the AnC~ ry making a call to service providing the telephone number of the Wil~ buu-.~
~elPrhnnP associated with the ~!.!P~,Ly, or by simply reading ~iaid ~lPrhonP number if it has been manually ~L~sDLûL~ in the 20 ~A~ svLy. When the hAn~lhPld is removed from the charger, the ~tored telephone number is deletet from the store of the hAnAhPl d . Thus, the h~n~lhPl d will provide the t~lerhnn~ number of the temporarily associated wir~ ,u--d tP7-m;n~l to redirec-ting points capable of what may be called s i~nAl in~ supported 25 r~ l ;n~ but only as long as the h~n~hP~l of the called subscriber pB is placed in the ~cP~ y.
According to zmother aspect of the present invention it also provides a method and apparatus for signaling supported re~ l ;n~, i.e. for call setup from a calling subscriber pA to 30 a called subscriber pB whereby two connections are normally set up, a f irst preparatory c~nnP~ti on in order to data-signal to the redirecting point in the tPrmi n~l A itself, or in an A~ ~ec~v,y for the ~Prm;n~l A, or in a service node under the control of t~rm;nAl A, information on the called subscriber 35 pB's paL -Le~D, in particular his/her alternative t~rm;n~l C addresses including sometimes the tP~m;n;~l B number itself, ~ WO9~/33326 21 891 1 9 r~

and a second connection for the actual ufier traffic between the subscribers pA and pB. A novel mobile or wir~ buu-.~
- tP~m;n~l A or a service node SN under control of the calling sub6criber pA is used to call a novel tPrm;nAl B, preferably 5 of the mobile radio type, whereafter said called subscriber pB's p~rameters are Ri~n:~led from the ~P~;n;~l B to the tPrm;n~l A, passing tran~parently through the network(s), normally a6 in-band Dq~IF or FS}~ signaling although digital coding may be used e.g. over some cellular radio air-inter-faces. Note however, that rP~ l in~ is not always indicated.
The preparatory call mentioned above may be kept c~nnected and used for traffic e.g. if the called subscriber has no alter-natives to his/her radio ~Prmin~l or if the call is direct or forwarded only via some negligeable detour routing making no 1~ difference to the cost.
According to a further aspect of the invention it provides also a method and apparatus for making ~aid first ~Lt:~al<ltory cnnnPct~-~n from said novel originating tPrminAl A to said novel term;n~l B via a service node SN, whereas said second cnnnect; on for the actual user traffic between the subscribers pA and pB is set up directly, bypassing said ~ervice node SN.
According to a further ~spect of the invention it provides also a method and apparatus for making said first ~L-:~aL~tCJLy connection from a known type of originating tP~m;n~l A to a novel tprm~n~l B via a service node SN under control of the calling subscriber pA, whereby said first and second connec-tions both are set up via said service node.
According to a further aspect of the present invention it provides a charger ~rcP~,,y for a mobile radio torm;n~l performing also the function to identify the tP~erhr~nP line to which it is connected together with a WiL~ buu~d tPl erhone set, when identifying is requested by a h~n~lhPl d being inserted into the charger. The charger aCcpc~sry performs this function by calling a service which retrieves the calling line S5 number, i.e. the so-called A-number, according to well known W0 95/33326 2 1 8 9 l i 9 PC r/sEs5loos78 ~

,cedu,.:s and transmits it back in-band to the calling charger AccD~nry.
A first merit of the present invention is to provide person to person ;cation over any tr~rminAl~ in all n~ ,L~
5 whereby the person is identified by the tDlPrh~n~D number of one of his/her tDrminAl~, preferably his/her hAndhDld.
A further merit is to minimi~e i~Ation cost when interworking between cellular and business systems. According to the invention a called business subscriber acros6 the 10 corridor may be called on his/her hAn~hr~ld and redialed automatically to his/her temporary desc-top t~rminAl.
Supplementing cellular-to-wi~ b~,u--d redirecting of calls by automatic re~liAl ing according to the present invention enables person to person telephony at the lower wire-bound 15 cost.
A further merit is to enable cost saving for all com-munication. The hAnAhDld, apart from being a 1 r~l-minAl for relatively expensive ~ i ration when the owner drives a car etc. is also a portable private home location register HLRP
20 informing on lower cost ~ ation alternatives when available and on other called subscriber parameters such as e.g. time when he/she can be reached.
A further merit of the invention is the p~s6ihil lty to provide the inventive feature without new ~L~ duLe~. This is 25 achieved by, ~ in1nrJ battery charging of a hAn~hDld which is already ~L t.~ CDd and ~ d by subscribers, with the inventive registering of nearby wiL~ buuu.d tDrm~nAl~ in a hAndhDld which would easily be forgotten if separate.
A further merit of the invention is the possibility to 30 provide the inventive feature for wir. b~,u.-~ tDrminAl~ used to originate a call without changes to the existing t~rminAl~.
This is the case if the inventive means required on the calling side are implemented in accessories to the tDrm;n~l~
or in exchanges (e.g. PABXs) to which the tPrm;"Al~ are 35 cn"nDct ~Dd .

~ WOS5/33326 2 l 89 l 1 q ~ r~

BRI1!F Dl~__K1~-_ OF TE]~
Figure 1 illustrates prior art forwarding in a mobile services switching centre ~SC2 visited by a called subscriber pB having a tP~mins-l B.
5 Figure 2 illustrates prior art forwarding in a mobilQ services switching centre MSCl being the gateway MSC of a calling subscriber pA having a to~m;nAl A.
Figure 3 illustrates prior art forwarding in an electronic secretary ES owned by a called subscriber pB having a 10 t~rm; n~l B.
Figure 4 illustrates prior art No 7 s:;gnAl ;nq of a called tP~;nAl B's telephone number to the calling tP--m;n~l A.
Figure 5 illustrates a ~ ; cation system including an L of the present invention;
15 Figure 6 illustrates an ~ L of the present invention in a rPll~ r mobile network c~ nPctPcl to a WiL~ b-,u-,-l network.
Figure 7 illustrates an: '~~'; l. of the prQsent invention in n: ~h:, supported by special service tDrm;nAlc.
Figure 8 illustrates an: ' ~ L of the present invention 20 where a handheld is placed in a special battery charger.
Figure 9 shows . ' ~ '; r L5 of the invention with special c;~ on cases using a service node.
Figure 10 shows a blor~ ; A~--am of a h;-ndhPl d and battery charger A .~-.,Ly according to the invention.
25 Figure 11 shows exemplary information displayed on the charger Ac~-c~ y and selection keys according to the invention.
TTDr~ OF ~ I .~r~ _ Figure 5 Chows a diagram of a r ; cation system inc-luding wired subscriber t~rm; n;~ only and in which the method 30 according to the invention is used. A calling subscriber pA
(not shown) has a wire-bound tPrm;n~l A 501 connected to a private autoDIatic branch exchange PABX 504. Such an PyrhAn~e is well hnown in the art and serves a limited number of _ _ _ _ _ _ . .

WO 95/33326 1' . r 2 1 8 9 1 1 q ~ ?h. /~ /ff 1~
subscribers in a limited ~rea. It ha5 a number of subscriber lines connected to it and performs switching and multiplexing of these subscriber lines to any among several trunk lines 513. One example of such an exchange is the MD110 marketed by 5 Ericsson (see Eric6son system description ASB 50104, ~ L
number 1551-ASB 50104 Uen). The PYrhAnge 504 is rnnn~ctecl to the public switched telephone network (PSTN) 505 via the trunk line 513. A PSTN is generally a network which includes group selectors, trunk lines and other blocks and circuits such as 10 exchange te~rmin~l circuits, interface circuits, 5i~n;~1 ln~
systems, control systems for ~rc,~l and program routines etc. in order to iC~te and to direct ir ;m~ calls and signaling information to intended destinations such as other PABXs. A PSTN can include the tele i ration system of one 15 or 6everal countries and the transmission means between the tel~rhnn~ systems of several countries. Thus, the outgoing lines from the PSTN 505 can be trunk lines connected to group selectors or PABXs in another country than the country where the PABX 504 is located. In figure 5, one such PABX designated 20 506 is c~nn~c~ to the PSTN 505. The called subscriber pB
(not shown) is assumed to have a wire buul~ telPrhnn~ set 502 connected to the PSTN 505 via a local ~Yrhr~,~ (not shown) in order to ;r~ ate to other ~ubscribers in a known manner.
Subscriber pB is ru~ assumed to have left his ordinary 25 t~t~nin~l 502 and to have roamed to the location of tc~-m;n~l C
503. This t~nin~l C is cu..~ Led to the PABX 506 which in turn is connected to the PSTN 505 via a trunk line 515 in the same manner ~s mentioned above regarding PABX 504. The subscriber pB has reguested and obtained by the usual well 30 known ~ùc6duLc that all calls ;- ;n~ to his/her t~-m;n~l 502 be forwarded to t-~rmin~l C 503. In figure 5 there are furth- t two service nodes 507 and 508 which are associated and connected to the PABXs 504 and 506 respectively. The service nodes 507 and 508 may be described as small PABXs e.g.
35 of the same MD110 type as mentioned above and they perform functions related to the present invention which will be W0 95/33326 2 1 8 9 1 1 9 P~ h~ c ,~

described below. It i5 possible to integrate these functions in the respective PABXs 504 and 506. But the invention is better understood AC~ m;n~ they are separate. In the following an example of setting up of a call from calling sub6criber pA
5 to called subscriber p8 will be described.
A calling subscriber pA in Stnrl~hol~n intends to call a FLc..-_lL,u-n having a wire buul~ tD~minAl 502 cnnnDcted to the Public Switched TDl~rhnnD Network PSTN 505 in Paris. However, the FL~ has roamed to 0810 and has forwarded in the 10 traditional way hi8 i r ; n~ calls to the PABX 506 and conventional WiL- buu..d tDrm;nAl 503 in 0810 which is sym-bolised by the switch 514. A seNice node 507 is connected to the PABX 504 and performs the inventive rP~l; Al in~ when indicated. A seNiCe node 508 is connected to the PABX 506 and 15 answers all ;- ;n~ calls automatically. The tDnm;nAl B 502 is connected directly to the PSTN. Subscriber pA goes of f-hook with his tDnm; nAl A 501 ~nd dials the French international number of torm;n:~l B 502 known to him and is connected via connection 511 to the seNice node (SN~ 507 cnnnPcted to the 20 PABX 504. The connDc~;on 511 between the tD~;n~l A 501 and the SN 507 may be set up automatically when tDnm;nAl A 501 goes offhook or it may be selected by dialing a prDcl~D1 ;nDc'l prefix e.g. 0031, to the 6aid number of tQ~m;nAl B 502. The SN
507 est~h~;chDc a preparatory call, DnAhl;mJ r~rl;Al;n~ if 25 reguired, between SN 507 and SN 508 via connD~t;nnC 513, 515, and the switch 514 symbolising the forwarding in the PSTN 505 in Paris using the t~DlDrhnnD number of tD~;nAl C 503 which has been stored in the PSTN by the roaming FL~ l~an according to known Art. SN 507 signals a dual tone multi ~L_~U~ y DTMF
30 code, e.g. "#" cnnt;n~ y to SN 508 until SN 508 signals off-hook on behalf of t~ ;nAl C back to PSTN and until SN 508 has received this DTMF code #. SN 508 goes automatically and unconditionally off-hook and sends in DTNF form to SN 507 via Paris, i.e. connections 515, 513 and "switches" 514 and 512, 35 the t~-~n; nAl C 503 telefon number and any other data of interest such as e.g. a Nordic ~obile Telephone NMT number o~

W09~l33326 r~ 'or /n 2 ~ 16 a not shown alternative mobile radio ~DrminAl that may be dialed in case of no answer from t~rm;nAl C 503. SN 507 stores these C numbers and analyses them together with the B number of t~rminAl 502 and the A number of t~ nAl A 501 which are 5 available to SN 507. An algorithm in SN 507 indicates that rorl;Al 1ng by subscriber pA is advel..LIg~uus from a cost point of view since the connection Stockholm to Oslo is much shorter than the connection via Paris. Therefore SN 507 goes on-hook to terminate the preparatory call and off-hook to set up the lO actual traffic call, whereby SN 507 dials the terminal C 503 number received from Oslo, thus short-cutting the detour or LL~ ' ~ via Paris of the ~ aLc.~ory call. If instead the Frenchman had roamed to Madrid reA; ~ l i n~ would not be of interest to the calling subscriber pA because then pA would 15 pay for the whole connection from Sto~ kh~lm to Madrid instead of from Stockholm to Paris only since the roamer usually pays for the forwarded part of a conn~ot; on. The action of ter-minating the preparatory call and estAhl ;~h;n~ a traffic call via connections 516 through PSTN 505 is symbolised by the 20 switch 512. Also said traffic call is received first by SN
508, but without the DTMF code "#l- on the line, and SN 508 c.... ,~ the call via c~nn~ct;~n 517 and PABX 506 to terminal C 503 after a short ~ ouL of about 1 second making E~ure no DTMF code "#" will be sent, which would indicate a preparatory 25 call, It can be seen that the service nodes SN 507 and SN 508 have different roles to play in the described call, SN 507 being the originating SN and SN 508 being the terminating SN.
Of course, if the function is i--L~duced, each PABX will be ~T~;rPed with both type8 (originating-terminating) of SN.
30 Further, it should be understood that the SN types have been described as separate torm;n~l functions in a PABX. But it is possible and even desirable to integrate these functions in the PABXs which is easily understood by those of normal skill in the art. Another variety of the invention is to integrate 35 the service nodes in the respective t~rm;nAl~ or to provide them as desc-top accessories to existing telephones. Alter-W095113326 2 1 8 9 1 1 9 T~~ . c ,~

natively, ~rm;n~l C 503 can be a mobile radio t~rm;n:~l and bephysically integrated with the SN 508 such that both the preparatory call and the traffic call are answered in the same t~rm;nAl C. In this latter case, service node 508 is portable 5 and radio connected to the PABX 506. The preparatory call includes a detour via Paris and the traffic call is routed directly from Stnrlrhnlm to Oslo via connections 516 and 517.
Note that although in the particular case of figure 5 the signaling between PABXs 507 and 508 could follow some known 10 standard inter-exchange signaling this is not desirable.
Instead, according to the invention, in-band ~i~nAl;n~ e.g.
Dual Tone Nulti FL~ua~ y DTNF, is used in order to provide signaling means compatible with both the case when the called number is an address of a service node SN and the case when it 15 addresses a t~rmin~l, since torminAlC cannot use interex-change c-i~n;~l ;n~. When integrating the inventive functions with the t~rminAl~: or making arc~csories for single t-~rm;n~lc the previously mentioned PABX MD110 cannot be used because it is too big. Refer to figure 10 where blocks ~LC and HLRP are 20 shown as included in the block Control B. The fllnrtjonc are the same as in the service node6 but limited to just one subscriber, whereas the not integrated SNs 507 and 508 of figure 5 serve many subscribers.
Figure 6 illustrates an _ 'i of the present invention 25 in a cellular mobile radio network crnci~:tin~ of mobile ~ervices switching centres NSC1 613, NSC2 614, home location register HLR 615 and two mobile radio tr~mi n:~l c 611, 602 . This network is cnnn~oct~l to a WiL- buu~d network PSTN having two t~rmin~lc A 601 and C 603 with arc~Ccrries 604, 607 and 606.
30 A calling not shown subscriber pA has a t~rmin~l A consisting of a plain old telephone POT 601, a personal computer PC 604 and a human control module HCL 607. The calling subscriber pA
uses the telephone 601 to dial the telephone number of a called subscriber pB having the mobile radio te~rmin~l B 602.
35 The connection is via line 621, 623 to the public switched telephone network PSTN 605 and via line 624 to the mobile W09sl33326 r~llah~

services switching centre MSCl 613. AlternatiYely, a mobile radio torm;n~l (A) 611 and a radio channel 630 may be used by the calling subscriber pA instead of the Wil~ buu--d terminal 601. NSCl 613 sends the dialed B ~ -r via signAl inq connec-5 tion 632 to the home location register HLR 615 and receivesfrom H~R 615 a roaming number allowing routing to the mobile raaio t~rminAl B 602 via the PSTN 605, connections 625, 626, a mobile services switching centre NSC2 614 and a radio connection 628. The mobile radio t~rm;n ll 602 has earlier 10 registered itself as being in the area of MSC2 614, whereby the siqnAling connection 633 was used by NSC2 for the regi-stration. The difference to the case illustrated in figure 2 is that in the case of figure 6 the C-number is kept stored in the inventive personal home location register HLRP 608 of the 15 t~rmin~l B rather than in any part of the ne~ OLk~ If we now assume that the called subscriber pB has further to hisJher h~nrlh~l~i t~rmins~l B a wir~ buul~ t~rmin~l C 603 on a desk nearby and that the telephone number of tC~rminAl C 603 is stored in the HLRP 608 of t~rm;n~l 602 when the described 20 preparatory call arrives to NSC2 614, said telephone number of t~ minJ-l C 603 is signaled back over PSTN 605 and the connec-tions 626, 625 to NSCl 613 and the PSTN 605 and cnnn~c~ n~
624, 623 to the human control module HCL 607 from where the call may be redirected to the wi~ ~uu~-l t~rm;n~l C 603 via 25 PSTN 605 and connections 629 as indicated by the switch 622 in HCL 607 whereby HCL 607 may perform fully automatically under the control of a pL~ Lu~L ~ ' algorithm or semi-automatically involving the c~election via the keyset of t~ n~l A 601 of one of several alternative f~rm;n~l C numbers presented on a 30 displ~y 609 of HCL 607. The mobile tC~rmin/~l 611 has a hu~an control module 612 which performs a re~ l ing of the terminal 611 over a second radio channel 631 by mean6 of a new access as symbolized by the switch 629. If the mobile t~rm;n~ 611 iS
u~ed as a calling terminal (A), HCL 612 may redial over the 35 second radio channel 631 as mentioned.

A reason to choose t~rminAl C rather than t~rm;nAl B may be the lower cost of WilG buu-,d calls. An alternative reason may arise if the calling subscriber pA has a personal computer 604 c~ o~ cl to his/her line and the called subscriber pB has a 5 cc,,,-~ in~ personal computer 606 cnnn~ot~d to a WiI. bu u--d te-rminAl C. The signaling aided reSiAl in~ may occur ~t the very b~innin~ of the call or during the traffic call when the communicating parties decide they want PC i c~tion. Then a predet~-rmin~d yLoc~lluL~= may be used to in-band signal the 10 t~minAl C number to the t~rminAl A followed by r~ iAl in~ as described earlier.
Figure 7 illustrates an ~ of the present invention in n~ hY supported by special service t~rminAl~3 as des-cribed in the above mentioned international application 15 WO94/051291 hereby included by reference in the present application. It can be understood from this: ` ~';- ~ that the information on alternative t~7-m;nAl~ C may be si~nAl~d from a service node supporting the called subscriber pB, rather than from a t~rm;n;ll 8 of the called subscriber pB. A
20 calling subscriber pA wanting to communicate with a called subscriber pB uses a WiI. buu--d terminal A 701 to call the c~ r mobile t~rminAl B 704 via a network of intelligent t~ nAl~ 702, 703 e.g. private branch ~ NDllO named hereinabove, using, when dialing, a prefix or special number 25 preceding the cellular number. Via connPctinnc 711, 713, 714 and PSTN 705 a call is set up to the int~l 1 iq~nt node PABX 702 which analyses the dialed number and f inds that the called ~;ubscriber pB's home node is PABX 703. PABX 702 L~yue:,L~ and receives via a digital ,ciqnAlin~ cnnn~ n 715 information 30 about the present location of the called subscriber pB having t~rmin~l B 704 and signals by in-band F:iqn~l in~ this infor-mation via connections 714, 713 and PSTN 705 to human control module EILC 707 of t~nin~l A 701. It is understood by those of ordinary skill in the art that the in-band siqnAl in~ refers to 35 transmission over connections 714, 713 and through the PSTN
whereas signaling from PSTN to the terminal A may alter-_ _ _ _ _ _ - _ _ _ _ _ _ . _ _ _ _ _ __ __ _ _ .. . .

w095/33326 2 1 8 9 1 1 q r~ . t ~

natively involve digital coding over the air-interface in the case of t~ n~l A being a digital cellular mobile ~Prm;nAl such as a digital EIA/TIA IS-54 tP~;nAl. Again, as P~rlAinPd hereinabove for fig. 6, rP~liAl 1nq may be performed in the HLC
5 707 of t~m;nAl A when the information about the location of the called subscrlber has been received from PABX 702 and analysQd, either re~;~ll in~ fully automatically using a prP~Pf 1 nPc~ algorithm or including a selection step whereby the subscriber pA selects from alternatives shown on display 708 10 using the keys of the POT 701. This rP~ l inq which is Sy ~ PIl by the switch 712 re5ult5 in a connection between POT 701 and h~n~lhPld B 704 via cnnneC~jons 711, 716, 717, radio ronnect;nn 718, the PSTN 705 and MSC 706.
Figure 8 illustrates an ~ L of the present invention 15 where two subscribers pA and pB have tPrm;nAl~ A and B plus C
respectively. They work for the same firm in the same location and are both cnnnPrt~cl to the same PABX. The subscriber pB has just entered his room and placed his hAn~lhPltl in a special battery charger 804. The battery charging function is ac-20 _ ,1; ~:hpcl either by using the -48 Volts provided by the PSTN
on a tPl PrhnnP line or by connecting the charger to the mainæ
whereby both methods are easily understood by those Or ordinary skill in the art. Further to said battery charging function, the battery charger 804 informs the inserted 25 hAn-lhPld according to the present invention of the telephonQ
number of plain old telephone POT 803 rnnnPC~Pd to the same line as the charger. One way of this informing is as follows:
When a hAn~hpl~ B 802 including a per50nal home location register HLRP 817 is inserted into the battery charger 804 a 30 contact is made by a not shown C~'rlnPCtOr connecting the handheld 802 and the battery charger 804 whereby a call is initiated via connection 819 to a 5pecial 5ervice device 820 rrnnPctec~ to or inside the PABX 806. The device 820 requests the telephone number of the line 819 from which the call i8 35 made and recelves according to well known ~uCe-luL~s the A-number of this line. The device 820 then returns this A-number S WO 95133126 2 1 8 9 1 1 ~ r~

via the calling line to the tormi nAl 804 which in turn t~ansfers this information via said cnnnoctor to the hAn~lh 802 storing this A-number in HLRP 817 as long as hAn~hold 802 stays inserted in the battery charger 804. Alternatively, if S no such service 820 is available with the PABX 806 the identity of the line to which the battery charger i8 connected may be entered manually into the battery charger 804 at installation of said battery charger via e.g. the keyset of the associated POT 803 using a prede~orm;nod ~LuceduLe:. This 10 may even be preferable because then nothing new is required in the r ' ~L h~- .
If now a calling subscriber pA from his POT 801 with C~S~OLY HLC 807 dials the handheld of subscriber pB a call is set up via connoc~tionc 811, 812, 813, radio cnnn~ctinn 814, 15 the PABX 806, the PSTN 805 and the MSC 810 to the hAndhold 802.
The hAn~held has registered itself earlier as being in the area of MSC 810 whereby the registration was recorded in HLR
808 via connection 818. The HLC 807 of torm;nAl A receives now from HIiRP 817 the telephone number of torminAl C 803 and any 20 other t~rminAl C telephone numbers and information as explai-ned hereinabove, via the air interface 814, connections 813, 812, 811 and MSC 810, PSTN 805, PABX 806. HLC 807 then analyses the received d~ta and may perform rod;Al ~n~ as indicated by the switch 809 either fully automatically using 2S pro.~iofinorl criteria or inrl~ ng a solo~tinn step implying that the calling subscriber pA selects via the keys of POT 801 2m alternative shown on the display 800. The redialed call is set up via cnnnoct;nn~: 815, 816 to POT 803 via PABX 806. For those of ordinary skill in the art it is obvious that the 30 a~Coc~, ies HLRP 817 and HLC 807 may be ~ ~nod into one single oql1; L allowing the created torminAl to perform both originating and terminating calls according to the present invention .
The present invention provides a personal home location 35 register in the handheld itself. However, if the hAndheld is switched off, a proble~n arises because the called subscriber .. . . _ _ _ _ _ _ _ _ _ _ _ _ _ . _ .

WO 95/33326 2 1 8 ~ 1 1 q l~,l/D~r.t . /~ ~

pB cannot be reached and also information of alternative ways to reach him/her is unavailable. Therefore it is ~ hl p to use call forwarding at no answer to a WiL~ buu~d torminAl, such as a tol orh~ne answering device, able to give default 5 information when on-line information is not available.
The storing of torm;nAl C numbers in the hAn~lhold using a special battery charger 804 is only an example of how this storing function may be p~LL~ - '. Other methods are pocc;h~o as e.g. o~lR;no~ inUS application 08/019.689 where a barcode 10 reader in the hAn-lhol d is used to read a telephone number available as a barcode label on a POT. This application is hereby included by reference.
Figure 9 shows three further - '; tY of the invention, the first one where the called subscriber uses an inventive 15 battery charger, the second one where the calling subscriber uses an inventive battery charger providing an ;n~ A~. ~
roA;Al;n~ point further to the service node 905 and the third one combining the US patent application 08/019,689 with the present invention. In figure 9 only the 10rm;nAlR and redia-20 ling points are shown in order not to overload the descriptionbecause in figures 5 and 6 the participation in the inventive ;- ts by the PSTN 505, 605, MSCs 613, 614, HLR 615 and PABXs 504, 506 has been '~ lA;norl in detail. Where a battery charger is shown in figure 9 it has been assumed to be of the 25 model associated not only with terminating but also with originating calls as ~'IiccllcFo~ in csnnocti~n with figure 8 ~nd as may be seen from the fact that a display 909 is part of the battery charger allowing the calling subscriber to select a displayed t~lorh~no number for rO~A1 ~n~. The top of figure 9 SO shows the simplified block diagram including an originating hAn~hol~l to~m;nAl A 901, a nearby WiL~ b~u~l tornn;n~l A 903 with battery charger 909, a service node SN 905 similar to SN
507, a te~ninating h~nrlholrl tot-m;n~l B 902 and a nearby wire-bound t~l-m;n:~1 C 904 with battery charger 909.
35 In a first . ';- L of figure 9 the to~;nAl 901 iB
replaced by a plain old telephone POT 906 calling a handheld ~ WO9~/33326 2 ~ 8 9 1 1 9 P~ J~

902 via the service node 905, which may imply using a special prefix like e.g. 0031 infront of the ~ rhnn~ number of tD~-m;nAl 902 when performing dialing on t~-minAl 906. A
connection 911 i5 set up, the call is parked in SN 905, SN 905 S calls t~rm;nAl 902 via connection 912 and indicates the preparatory call nature by sending the Dq~lF signal # on the line toward6 t~nminAl 902. The terminAl 902 goes immediately ~nd unconditionally off-h~ok, senses the signal # on the line, gives the data answer 913 by sending in DTlqF form the ~rminAl 10 C number earlier registered in its personal home location register HLRP 917 when inserted in the battery charger 909 of nearby t~rm;nAl C 904 as symbolised by cnnn~C~io~ 910, after which SN 905 sets up a cnnn~ct;~n 914 to wil~ b~uu~d t~rm;nAl 904 eliminating any detour routing that may have occured in 15 cnnnec~isnc 912 and 913 as l-:~Le::,el,~ed by the associated zig-zag lines. Note that in this ~ L the calling ~rm;nAl A is a POT Father than a t~m;nAl of the inventive type 903 and that the re~ l ;n~, eliminating detour routing is p~-r~ - ' in the service node SN 905.
20 In a second ' ~'; L of figure 9 the service node SN 905 is used only for the preparatory call conn~ct;nnC 921-924, whereas the traffic call conn~t;orl 925 goes directly from the calling t~n;nAl A 907 to the called t~-nm;nAl B 904, bypassing the SN. The preparatory call (921-924) is the same as descri-25 bed earlier (911-913) but further including connection 924 from SN 905 to t~rm;nAl A 907. Also in this ~ L it has been assumed that registration 910 pLeceded the call from t~ minAl A 907 to f~rm;nAl B 902, C 904. Note that re~l;Al;nq in this: - ';- L is pelLr~ -' in t~rm;nAl A 907 and that 30 service node SN 905 only handles the ~ a-c-to.y call.
In a third - -';- L o~ figure 9 the service node SN 905 is used for all steps in setting up a traffic call via connec-tions 934, 935 between the wi~. b-~u-l-l terminal A 903 and the WiI~ b~ulld torm;nAl B 904 whereby the hAn~lhPld t~l-m;nAl A 908 35 and the hAn lh~ld t~rm;nAl B 902 are used only with the C~ A~ ~ b b-w09s/33326 21 89 f i 9 r.~ c~
2~
assumed that registrations via connections 930 and 910 have occured be~ore setting up the described call. This traffic case has earlier been described in US application 08/019,689 c~xcept for eliminating detour routing connections 932, 933 by a direct connection 934.
An advantage of having a service node SN 905 according to figure 9 consists firstly, in providing elimination of detour routing even if the A c.uI,s~;~ iber is a POT without a r~ 1 inq ncr-~ç cory and secondly, that any adaptation of different signaling systems is performed in the SN. SN is preferably located near the A-subscriber in order to avoid introducing new SN-related detours. The service Node SN 905 is a switch with a processor, e.g. may be a PABX connected to the public network as described earlier. But a SN 905 may alternatively be an integrated part of any network, e.g. th~ PSTN.
Figure 10 shows a hlork~i~qram of a h~n~h~l~ mobile radio station 1000 and battery charger ~r~ nry 1001 according to the invention. The hAn/lh~lfl 1000 is e.g. according to a c~ r standard such as the Global System for Mobile iations GSM and has associated with it the inventive 8"rr] ~ ~ry control B 1020. The plain old ~ rhnne POT 1002 is of the type having a keypad and has ~ssociated with it an inventive battery charger 1001. According to the invention, control B 1020 is provied in the h~n~h~l d station 1000 and control C is provided in the battery charger 1001. Each control B, C contains the logic, memory and interfaces associated with the earlier described personal home location register HLRP and human control module HLC, i.e. the blocks performing the inventive Eign~l inq supported re~ 11nq on the terminating and originating sides of a call respectively.
Registering the telephone number of the POT 1002 in the h~ndhc-ld 1000 is performed as follows. The subscriber pB has e.g. come home and has in~erted his/her handheld 1000 into the battery charger 1001 whereby conn~rt j nn is made between control B 1020 and control C 1030 on the one hand and between control C 1030 and the battery 1019 on the other hand. Further ~ Wo 95/33326 2 1 8 9 1 1 9 F~

to starting the charging of the battery this action triggers control C 1030 to call a prestored service number in the PSTN
and ask for identification of the telephone line 1040 whereby blocks 1032, 1033 are used in a way f~m; 1 i i~r to those of 5 normal skill in the art. Said PSTN service identi~ies the telephone line 1040 using known A-number trAn~ 5; nn methods and sends the identified A- back to the control C 1030 via the line 1040 itsel~. Control C 1030 then transmits this A-number to control B 1020 where it is stored for later use as 10 a C-number, i.e. as an alternative t~rm;n~l address to be sent to a subscriber pA calling the h~n~lh~ld t~rmin~l 1000. When the subscriber pB leaves home again taking the h~n~h-~l d out of the battery charger 1001 this triggers the control B to erase the stored C number from its memory. The mentioned signaling 15 between the battery charger 1001 and a PSTN service may be pe,r, ~ by a pr~tPrmin~d in-band ~ign~l ;n~ ceduLe easily ~l~cign~ by those of normal skill in the art.
Receiving a call when the h~n~lh~ld lO00 is standing in the battery charger lO01 is as follows. Subscriber pA calls from 20 his/her inventive t~rmin~l A (not shown) the t~rmin~l B 1000 sending DTNF signal lt in order to indicate to ~rmin~l B that a data answer is requested. Terminal B 1000 goes uncon-dltionally and automatically off-hook, reCo~n;Cc~c the DTMF
signal X and answers sending as DTMF digits the , 1 C~te 25 t~rmin~l C number ;n~ ;n~ area code and national prefiY from its memory t rget h~r with any other information in DTMF form and/or as a voice message such as described in c.,..ju,.~ Lion with figure ll. The t~rm;n~l B 1000 wiil then be d;cc~ d due to the t~rm;n~l A (not shclwn) going on-hook. Terminal A
30 redials using the t~rm;nAl C number received and an ;- ;n~
call on line 1040 will be ~tected by control C 1030 via the switches 1033 and I/0 block 1032. It is poc~ihle for said in~l A to repeat the ~L~ceduL~ starting with DTMF signal # which will cause control C 1030 to provide any further 35 information as e.g. the availability of a nearby personal computer PC (not shown) on another 6pecified telephone line.
_ _ _ _ _ _ _ . ., _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ W09sl33326 ~ 1 8~ 1 1 9 ~ c~

The tP~min~l A will then give an alerting order in DTMF form to control C 1030 which will cause alerting in block 1032 and subscriber pB will go off-hook with POT 1002 establishing a traffic connection via line 1040 and the switches 1033 to POT
5 1002. In the case the t~rm;n~l A is not ecrl;rP~Cl for si~nAl i aided re~ l i n~ or does not want to DTMF signal #, the h,ln~h~ 1000 will, after time-out of about 1 second, via control B 1020 order alerting in block 1013 via control A 1010 and then subscriber pB will go off-hook with h~n~lhDl~l 1000 10 esf :`hl i ch i nq a traf fic connection via antenna 1018, transmit-ter TX 1016, receiver RX 1017, signal pro~C~;n~ block 1015, control A 1010 and speaker ~ miuLo~ho..e 1014. Note that in figure 10 it has been assumed that the hAn~h~lcl 1000 i5 of the GSN type and therefore, DTMF is received and sent over the 15 air-interface as digital codes but translated to/from analog DTNF in the land system.
Originating a call will be ~ Cll~c~d for the case the handheld 1000 is not in the battery charger 1001. An origina-ting call will be made Erom the wi,- b~ul-d t~rm;n~l 1002 if ZO possible because of lower cost. ~lowever the ~ ~c~dule 18 the same for the h~-n~lh--l, 1000 or the POT 1002 with ac ~
1001. Both have keypad and display 1012, 1031, controls 1010, 1030, alerting means 1013, 1032 and speaker & miuL~l,o.-e 1014, 1002 (POT). There is a difference in that the connection to 2S the air-interface uses antenna 1018, transmitter TX 1016, receiYer RX 1017, signal proc~cs;n~ 1015, whereas the connec-tion to the PSTN line 1040 uses switches 1033 and I/O for DC
and DTNF 1032 The air-interface of the GSM system uses digital ~ n~l ;n~ but on the land system side of the air-30 interface conversion of digital cj~nAl;nq to/from DTNF takesplace and DTMF inband signaling is used over the PSTN.
Therefore, DTIIF or other inband siqn~l i n~ such as FSXM is the sj~nll~n~ means used at least in one land system network of the embodiments and in some cases also over the air-interface, 35 e. g . when the handheld is an analog cellular mobile radio ~.rm;n~l such as an Advanced Mobile Phone Service (AMPS) _ ~ W095l33326 2 1 89 1 1 9 P~ 7;~

t~n;nAl . When making an originating call from the wire-bound or the radio t~rm;nAl of figure 10 the subscriber pA enters the digits of the t~l-m;nAl B of the called subscriber pB on the keypad of 1012 or 1031 e.g. followed or preceeded by the 5 key # to indicate that he/she wishes to use the inventive signaling supported r~l;Al inq facility. Control A respec-tively control B sets up a preparatory call to t~-m;nAl B (not shown) sending DTMF signal # on the line until an answer comes from the t~minAl B or, if t~rm;nAl B is not equiped for 10 ~ nAl;nq aided r~ ;Al;nq~ after a time out of about 1 second has elapsed after tDrm;nAl B has gone off-hook which may be sensed in the A-t~m;nAl in several ways known to those of ordinary skill in the art. If tPrm;nAl A receives rF~;Al ;n~
information, it is shown on the display and analysed using 15 predefined criteria or on-line decision by the calling subscriber pA as explained in more detail using figure 11.
Then, if indicated, re~liAl inq of a tC-rminAl C will take place after going on-hook/off-hook in tP~minAl A, otherwise a DTMF
order is sent from t~rm;nAl A to t~minAl B to keep using 20 t~minAl B and to perform alerting of the subscriber pB.
Figure 11 shows 5~l~ctinn keys and ~ lAry information displayed to a calling subscriber pA on the inventive mobile radio t~rmin~l or on the inventive charger ~ ,y of a wi~ buu3~d telephone. Consider the case of HLC 807 in figure 25 8, wherein the ~c~c~ -y 807 also may contain an HLRP and battery charging function which however is not of interest in flgure 8 because the operation of a display associated with the calling t~rminAl A is cnn~id~red. The display 1100 is a liquid cristal display showing Alph ic text 1101-1104 30 and a two-arrow cursor 1105. The cursor control 1108 allows cursor r ~ ~5 or scrolling up and down in the text. The YES
key 1106 may start rPAi ,1l inq to the t~minAl C 803, resulting in a traffic call between the POT 801 of t~rminAl A and the POT
803 of t~rminAl C. The NO key 1107 provides return to the 35 previous state, where there may be other choices such as e.g.
answering another call that has come in. The telephone numbers _ _ _ . . _ . . . _ . . . . . ... . . . . . _ . . .. . _ _ woss/33326 21 89 1 1 9 F~ t ,~

in figure 11 are hypothetical and do not corLe:,~v--d to any actual numbering plan6. The method of scrolling, selecting and activating has been described in detail in application US
08/213704 "uniform man ^hinD interface for cellular mobile 5 telDrhnnDc" hereby included by reference in the present application. In the example of figure 11 the dialed number 1101 and the B-nr 1102 of the answering t~l-m;nAl B 802 are different which indicates to the A ~s~, iber that detour routing (not shown in figure 8) via a fixed forwarding point 10 in the PSTN 805 has occured. If the dialed alternative is selected for the traffic call by having the cursor point to 1101 and pressing YES 1106 no redialing i6 reyue~,Le1 and instead an alerting order is sent from the HLC 807 to the HLRP
817 whereby the traffic call will be relatiYely expensive but 15 some seconds setting up time is saved if A is very much in a hurry. If the alternative 1102 is selected, the call will be redialed directly from t~;n~l A to t~rm;nAl B eliminating the detour routing, if saving cost. If the alternative 1103 is selected, the call is established from t~m; nAl A to the wire-20 bound tDrm;nAl C, thus possibly saving even more cost. Thealternative 1104 may regard another PvT and PC (not shown in figure 8) and may be redialed at the heg;nn;n~J or during the traffic call if desired. In figure 11 it has been assumed that the keypad of the HLC consists of the keys 1106, 1107 and ~5 1108. However many variations are pocc1hle whereby e.g. the 12-keys of the associated PvT or of the battery ~A,~ ~-r-~Ly are used according to a precl~f;necl ~LVvev,~lL2 for dialing and selection E~UL~oses as assumed above when describing figures 6 and 10.
30 A further ~ of the inventive tD~m;nAl will now be described without using a separate figure. The private home location register HLRP may be located in a mobile data term;nAl MDT. The Nl~T may be conceived as a mobile radio term;nJ~l capable of sending and receiving data and voice 35 - ~ coded as pulse code modulation tPCM) data blocks but where the MDT is not capable of being used for a bi-direc-~ Wo 95133326 2 1 8 9 1 1 9 r~ r~

tional real time .;ullv~:Ls~tion. All trAn~ sinn is datatransmission, whether actual data such as fax, or P~. _uded short speech ~ -ga~: first entered (talked into) the ~ar~n;nAl and PCM-coded, then sent by a pra~lata~minad ~luccdu~ to the 5 called subscriber or a service node where it is stored and may be retrieved as data or speech by the called subscriber. The MDT ta~ninAl may be used as the HIiRP of it5 owner to inform on tDrminAl~ temporarily available to the owner of the MDT. When no such t.~rminAl~ are available this may be ~ ed in the 10 answer to a caller suggesting voice message ~ cation via a service node with a voice mailbox. The NDT may be a satel-lite tarminAl whereby the limitation to short---Fa~a~ is an advz...L~g~: motivated by the high cost of the associated satellite air-interface time.
15 A further ~i L of the inventive tarminAl provides voice information about possible tarminAl C nu~bers as in the prior art, but ;narl with the inventive inband-~ nAl lng of tarm~nAl C numbers in order to allow redialing to be performed in a signAl in~ supported way when possible and 20 redialing according to the slow prior art method otherwise.
A further c`~- L of the inventive ta~minAl provides ~i~nAlin~ supported re~l~Aling during an already estAhli~ha~l call provided a tarminAl C number has been transmitted by the called subscriber to the calling subscriber and stored in the 25 latter~s tarminAl.
From the described ~ it can be seen that the ta~minAl A f~lnrtion~ may be located in the physical ta~-min~l A itself, but may alternatively be provided as a physically distinct 3rca~,Ly to a POT or as a service node SN function 30 under control of the subscriber pA whereby the SN mAy be located in the network near the subscriber pA but always under control of the tarminAl A used by the calling subscriber.
Therefore, the term "tarminAl A" in the claims is intended to comprise these physical varieties of the inventive ~:iqnAl inq 35 supported redialing function.

Wo 9S/33326 PCT/SE9~/00578 2~891 19 ` ~

The foregoing description of the specific . ';- t~ will 80 fully reveal the general nature of the invention that others can, by applying current knowledge, readily modify and/or adapt for variou6 applicationæ such specific em-5 ~rli- Ls without departing from the generic concept, and, therefore, such adaptions and modifications should and are intended to be ~ - ~ hended within the meaning and range of equivalents of the disclosed . ~`i- ~s. It i3 to be under-stood that the phraseology of torm;ns~logy Qmployed herein is 10 for the purpo6e of description and not o~ limitation.

Claims

WHAT IS CLAIMED IS:

1. In a communication system a method for setting up at least one traffic connection between a subscriber pA
calling from a terminal A and a subscriber pB called on a terminal B whereby said subscriber pB may have further terminals in the same or other networks, comprising the following steps storing in said terminal B at least one terminal address C over which the called subscriber pB may be reached calling said terminal B from said terminal A
whereby terminal B goes off-hook unconditionally es-tablishing a first connection between terminals A and B
signaling from said terminal B to said terminal A
over said first connection information including at least one terminal address C
storing in said terminal A said information and analysing whether it is indicated to disconnect said first connection and redial if indicated, going on-hook and off-hook in said terminal A and setting up at least one second connection between the subscribers pA and pB using as a destination said at least one terminal address C stored in said terminal A.
if not indicated, using said first connection as a traffic connection.

2. The method of claim 1, wherein the step of signaling comprises in-band signaling over a public telephone network.

3. The method of claims 1-2, wherein the terminal B is a mobile radio terminal.

4. The method of claims 1-3, wherein the step of storing in terminal B is performed manually via the keypad of the terminal B using a predetermined procedure.

5. The method of claim 3, wherein the step of storing in terminal B is performed automatically when the terminal B is inserted in a battery charging accessory connected together with a wire-bound terminal C to a telephone line and wherein the method includes in addition entering according to a predetermined procedure into said battery charging accessory at installation the identity of said telephone line 6. The method of claims 1-3, wherein the terminal address C is the address of the terminal B itself.

7. The method of claims 1-3, wherein the terminal address C is an address of a terminal different from the terminal B.

9. The method of claim 3, wherein the terminal B
is a terminal capable of data messaging only.

10. The method of claims 1-9, wherein the step of setting up at least one second connection is performed when initially setting up a call between the subscribers pA and pB.

11. The method of claims 1-9, wherein the step of setting up at least one second connection is performed during an ongoing call between the subscribers pA and pB

12. The method of claims 1-11, wherein the step of signaling is performed over a first connection between the subscribers pA and pB via a service node and wherein the step of setting up creates a second connection bypassing said service node and disconnects said first connection 13. In a communication system a terminal A used by a subscriber pA to call a subscriber pB on a terminal B
whereby said subscribers may have further terminals in the same or other networks, said terminal A comprising means using in-band signaling over at least one public network for receiving from said terminal B and storing in said terminal A at least one terminal C address over which the called subscriber pB may be reached and means for setting up at least one connection between the subscribers pA and pB using as a destination said at least one terminal C address stored in said terminal A.

14. The terminal of claim 13, wherein said terminal B is a mobile radio terminal.

15. The terminal of claims 13-14 in addition comprising means for using in-band signaling over at least one public network connection for telling the terminal B
that the terminal A requests the sending of alternative terminal C addresses.

16. The terminal of claims 13-15 in addition comprising in terminal A
means for automatically deciding whether to use the original terminal B address or any of the received terminal C addresses for setting up at least one connection to the subscriber pB wherein said deciding is based on predifined criteria.

17. The terminal of claims 13-15 in addition comprising the following means for deciding whether to use the original terminal B address or any of the received terminal C
addresses for setting up at least one connection to the subscriber pB wherein said deciding is carried out by the subscriber pA
means for supplementing said addresses with prefix, country code and other modifications when required for correctly routing said connection.

18. The terminal of claims 13-17 wherein said means are physically integrated in the terminal.

19. The terminal of claims 13-17 wherein said means are provided separately housed.

20. In a communication system a terminal B used by a subscriber pB to receive a call from a subscriber pA
whereby said subscribers may have further terminals in the same or other networks, said terminal B being a mobile radio terminal comprising means for storing at least one alternative terminal C address comprising at least the address of the B-terminal itself means for receiving a request to send at least one alternative terminal C address via which the called sub-scriber pB may be reached and means for sending said at least one alternative terminal C address when requested to do so.

21. In a communication system a mobile radio terminal used by a subscriber to receive and originate calls whereby said subscriber may have further terminals in the same or other networks said mobile radio terminal comprising means for receiving a request to send at least one alternative terminal address via which the subscriber when called may be reached means for sending said at least one alternative terminal address when receiving a request and means for also using said at least one alternative terminal address to set up a call when said subscriber originates a call.

22. A telecommunication system comprising at least one network and a plurality of terminals whereby com-munication between a calling subscriber pA and a called subscriber pB includes the possibility of signaling a terminals C address from a called terminal B during a first preparatory call and whereby this preparatory call may be followed by a second traffic call to said terminal C
address, the system comprising mobile radio terminals including means for storing and later sending at least one terminal C address when receiving said prepara-tory call means for requesting and receiving at least one such a terminal C address and using it to origi-nate said traffic call transmission means including means for transmission of user traffic means for in-band transmission of said at least one terminal C address over at least a part of the at least one network 23. The system of claim 22 further capable of setting up calls via service nodes, the system further comprising service nodes including means for connecting at least two lines to the transmission means of the at least one network means to receive an order to set up calls from the service node to subscribers pA and pB to execute said order and to interconnect said subscribers pA
and pB.