The present invention relates to a method of transmitting an acknowledgement to an A subscriber in a telephone system in connection with call establishment. In order to improve transmission of information between the parties to the call establishment, communications means are arranged in the system for...http://www.google.es/patents/US6430269?utm_source=gb-gplus-sharePatente US6430269 - Method of transmitting an acknowledgement to an A-subscriber
Method of transmitting an acknowledgement to an A-subscriber
