Patent ID: 8032656
Filing Date: 2011-10-04
Classification: H04L,H04W

Abstract:
1. A method of handling a data stream during a handover in a communications network comprising a first user agent having a SIP universal resource indicator, a proxy server and a second user agent, said method comprising: (i) mapping at the proxy server the SIP universal resource indicator with a dynamic network address allocated to the first user agent; (ii) sending a request by the first user agent to the second user agent for a data stream; (iii) generating by the second user agent in response to the request a plurality of messages each comprising part of the data stream requested and the SIP universal resource indicator of the first user agent, wherein the messages are SIP messages, and sending the messages to the proxy server; (iv) receiving the messages at the proxy server and determining the mapped dynamic network address corresponding to the SIP universal resource indicator in the received messages, and forwarding the messages to the determined dynamic network address; and (v) when the first user agent is allocated a new dynamic network address, replacing by the proxy server the mapped dynamic network address with the new dynamic network address and forwarding the received messages to the new dynamic network address.