Identification of connection allocated to centrex-group in telecommunications network, signals both physical and internal virtual call numbers to network

摘要

On connecting a call, in addition to the virtual call number internal to the centrex group, the actual, physical call number (PRA) of the connection called (A) is signaled from the centrex exchange (VSA) to the telecommunications network (NET). An Independent claim is included for the corresponding telecommunications system (SYS).