Method and system for retrieving network addresses in hybrid telecommunication network

摘要

Combinational networks may provide simultaneous connectivity over networks of different type between User Equipment of an A-party and B-party. A communication session, comprising a circuit switched call and one or more packet switched sessions, may be deployed simultaneously over different network types, in relation to the same User Equipment. The circuit switched call and the packet switched session may be correlated. As to retrieve the packet switched address of a circuit switched call partner, a retrieval for a packet switched network address is initialized by means of a circuit switched protocol over a circuit switched network. The address retrieval request is directed to the call partner or a network node that accomplishes the network address request.

主权项

1. A method in a second User Equipment for retrieving a network address and a terminal capability of a first User Equipment, within a telecommunication system comprising two or more networks where the networks include a Circuit Switched (CS) network and a Packet Switched (PS) network, the method comprising the steps of:
establishing a first communication session with the first User Equipment over the CS network, wherein the first and the second User Equipments are connected to the CS network; performing the following while the first communication session is in progress:
sending via the PS network, a request for retrieval of a PS network address of the first User Equipment, wherein the request for retrieval of the PS network address includes a CS network address of the first User Equipment, and wherein the request for retrieval of the PS network address is directly sent from the second User Equipment to a presence server in the PS network using a Session Initiation Protocol (SIP) message,receiving a first reply from the presence server comprising information regarding the requested PS network address of the first User Equipment, wherein the first reply contains a SIP Uniform Resource Indicator (URI) of the first User Equipment as the requested PS network address,sending via the PS network, a request for retrieval of the terminal capability of the first User Equipment in the PS network, wherein the request for retrieval of the terminal capability is a SIP message that is directly sent from the second User Equipment to the first User Equipment using the SIP URI of the first User Equipment,receiving a second reply comprising information regarding the requested terminal capability of the first User Equipment in the PS network, andindicating, on the second User Equipment, the terminal capability of the first User Equipment in the PS network; establishing a second communication session with the first User Equipment over the PS network; and maintaining the first and the second communication sessions simultaneously.