Patent ID: 8634530
Filing Date: 2014-01-21
Classification: H04L,H04M

Abstract:
1. A method for forming a telecommunications call comprising the steps of: calling from a multicast Internet Protocol (IP) or point-to-multipoint (PMP) ATM terminal, having audio and video streams, in a first network to a unicast terminal, having only an audio stream and only having audio capability, in a second network; and forming a call between the multicast IP or PMP ATM terminal and the unicast terminal using a mixer so the multicast IP or PMP ATM terminal and the unicast terminal communicate their audio streams with each other, wherein the forming step implemented by the mixer includes the steps of: wherein the mixer has a back-to-back user agent for presenting one interface to the multicast IP or PMP ATM terminal and presenting another interface to the unicast terminal, wherein the one interface enables the multicast IP or PMP ATM terminal to communicate with the mixer as if the mixer was another multicast IP or PMP ATM terminal without video, and wherein the another interface enables the unicast terminal to communicate with the mixer as if the mixer was another unicast terminal.