Voice data connection forwarding method involves transmitting voice data connection from internet protocol transit communication system in internet protocol based service communication system of another mobile function system

摘要

The method involves guiding a voice data connection (DV) to an Internet Protocol transit communication system (IPT) of a mobile function system (MS1,MS2) from line-oriented switched network of the former mobile function system. The voice data connection is transmitted from internet protocol-transit communication system in the internet protocol-based service communication system of another mobile function system based on another roaming identifier (IMRI). The service communication system are supported by Session initiation protocol signaling protocol. Another roaming identifier is assigned in Session initiation protocol-uniform resource identifier.