CA2443097A1 - Alternate routing of voice communication in a packet-based network - Google Patents

Alternate routing of voice communication in a packet-based network Download PDF

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Publication number
CA2443097A1
CA2443097A1 CA002443097A CA2443097A CA2443097A1 CA 2443097 A1 CA2443097 A1 CA 2443097A1 CA 002443097 A CA002443097 A CA 002443097A CA 2443097 A CA2443097 A CA 2443097A CA 2443097 A1 CA2443097 A1 CA 2443097A1
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CA
Canada
Prior art keywords
route
candidate
routes
request
list
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002443097A
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French (fr)
Other versions
CA2443097C (en
Inventor
Harry Edward Mussman
John Joseph Mccabe
David Frederick Mcguigan
Robert Keller Israel
Eric Richard Sporel
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Level 3 Communications LLC
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2443097A1 publication Critical patent/CA2443097A1/en
Application granted granted Critical
Publication of CA2443097C publication Critical patent/CA2443097C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1023—Media gateways
    • H04L65/103—Media gateways in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/104—Signalling gateways in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1106—Call signalling protocols; H.323 and related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP

Abstract

A method for performing alternate and therefore least cost routing in distributed H.323 Voice over IP (VoIP) networks is provided. With this method, the VoIP network consists of a hierarchy of gatekeeper (GK) functions to provide alternate routing, network element redundancy, and scalability. The alternate routing function is performed by a directory gatekeeper with route selection advancing from a first route to a second route by either of two conditions: (1) there are no resources available to terminate the call in the first zone; and (2) a lack of response to the directory GK request for such resources.

Claims (23)

WHAT IS CLAIMED IS:
1. A directory gatekeeper for performing alternate routing of calls through a plurality of gateway resources, the directory gatekeeper comprising:
one or more communication devices providing access to a plurality of resource management gatekeepers, each resource management gatekeeper associated with one or more of the plurality of gateway resources;
a memory device storing a list of routes wherein each route is associated with one of the plurality of resource management gatekeepers; and a processor operable to receive a request through the one or more communication devices, wherein in response to a received request, the processor performs alternate routing by selecting a route from the list of routes using the corresponding resource management gatekeeper to determine resource availability.
2. The directory gatekeeper of claim 1, wherein one of the one or more communication devices provides access to a packet-based network.
3. The directory gatekeeper of claim 2, wherein the packet-based network is an Internet protocol (IP) network.
4. The directory gatekeeper of claim 1, wherein the one or more communication devices provides access to the public switched telephone network (PSTN).
5. The directory gatekeeper of claim 1, wherein performing alternate routing of calls includes:
identifying one or more candidate routes based on the received request; and for each of the one or more candidate routes, selecting a candidate route from the one or more candidate routes;
determining if the selected candidate route is available; and if the selected candidate route is available, sending a response to the received request indicating that the candidate route is available.
6. The directory gatekeeper of claim 5, wherein performing alternate routing of calls further includes:
if none of the candidate routes are available, sending a response to the received request indicating that the request can not be completed.
7. The directory gatekeeper of claim 5, wherein selecting a candidate route from the one or more candidate routes includes selecting the least cost route as the candidate route.
The directory gatekeeper of claim 5, wherein selecting a candidate route from the one or more candidate routes includes selecting a candidate route from the one or more candidate routes at a predetermined ratio.
9. The directory gatekeeper of claim 8, wherein the predetermined ratio is selected such that the likelihood of choosing each of the one or more candidate routes is substantially equal.
10. A method for performing alternate routing of calls in a directory gatekeeper, the method comprising:
receiving a request to initiate a call;
determining a list of possible routes for terminating the call;
if a route is available, selecting a route from the list of possible routes by querying one or more resource management gatekeepers;
if a route is available, sending a response to the received request to initiate a call indicating the selected route; and if a route is not available, sending a response to the received request to initiate a call indicating that the request will not be completed.
11. The method of claim 10, wherein the request includes a telephone number.
12. The method of claim 11, wherein the number includes a numbering plan area (NPA).
13. The method of claim 10, wherein the request to initiate a call is an H.323 admission request (ARQ) message.
14. The method of claim 10, wherein each route in the list of routes is associated with a resource management gatekeeper.
15. The method of claim 14, wherein the step of selecting a route from the list of possible routes by querying one or more resource management gatekeepers includes:
for each route in the list of possible routes, selecting a candidate route from the list of possible routes; and determining if the selected candidate route is available.
16. The method of claim 15, wherein selecting a candidate route from list of possible routes includes selecting the least cost route as the candidate route.
17. The method of claim 15, wherein selecting a candidate route from the list of possible routes includes selecting a candidate route from the list of possible routes at a predetermined ratio.
18. The method of claim 17, wherein the predetermined ratio is selected such that the likelihood of choosing each of the one or more candidate routes is substantially equal.
19. A computer-readable medium including software for performing alternate routing of calls through a plurality of gateway resources, the software configuring a computer to performing a method, the method including:
receiving a request to initiate a call;
determining a list of possible routes for terminating the call;
if a route is available, selecting a route from the list of possible routes by querying one or more resource management gatekeepers;
if a route is available, sending a response to the received request to initiate a call indicating the selected rotate; and if a route is not available, sending a response to the received request to initiate a call indicating that the request will not be completed.
20. The computer-readable medium of claim 19, wherein the request includes a telephone number.
21. The computer-readable medium of claim 20, wherein the number includes a numbering plan area (NPA).
22. The computer-readable medium of claim 19, wherein the request to initiate a call is an H.323 admission request (ARQ) message.
23. The computer-readable medium of claim 19, wherein each route in the list of routes is associated with a resource management gatekeeper.
CA2443097A 2001-04-06 2002-04-08 Alternate routing of voice communication in a packet-based network Expired - Lifetime CA2443097C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/827,352 US7339934B2 (en) 2001-04-06 2001-04-06 Alternate routing of voice communication in a packet-based network
US09/827,352 2001-04-06
PCT/US2002/011076 WO2002082722A2 (en) 2001-04-06 2002-04-08 Alternate routing of voice communication in a packet-based network

Publications (2)

Publication Number Publication Date
CA2443097A1 true CA2443097A1 (en) 2002-10-17
CA2443097C CA2443097C (en) 2012-06-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2443097A Expired - Lifetime CA2443097C (en) 2001-04-06 2002-04-08 Alternate routing of voice communication in a packet-based network

Country Status (9)

Country Link
US (4) US7339934B2 (en)
EP (1) EP1386469B1 (en)
AT (1) ATE373375T1 (en)
AU (1) AU2002311807A1 (en)
CA (1) CA2443097C (en)
DE (1) DE60222400D1 (en)
ES (1) ES2292769T3 (en)
MX (1) MXPA03009118A (en)
WO (1) WO2002082722A2 (en)

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Also Published As

Publication number Publication date
US7720084B2 (en) 2010-05-18
US20150304504A1 (en) 2015-10-22
EP1386469B1 (en) 2007-09-12
US20080112327A1 (en) 2008-05-15
AU2002311807A1 (en) 2002-10-21
EP1386469A2 (en) 2004-02-04
ES2292769T3 (en) 2008-03-16
MXPA03009118A (en) 2004-11-22
US7339934B2 (en) 2008-03-04
CA2443097C (en) 2012-06-05
ATE373375T1 (en) 2007-09-15
US20030012178A1 (en) 2003-01-16
US20100226363A1 (en) 2010-09-09
WO2002082722A3 (en) 2003-11-27
WO2002082722A2 (en) 2002-10-17
US8948190B2 (en) 2015-02-03
DE60222400D1 (en) 2007-10-25

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