Patent ID: 9332467
Filing Date: 2016-05-03
CPC Classification: H04W

Claim Text:
1. A method of performing a session transfer with Single Radio Voice Call Continuity (SRVCC) from a Packet Switched (PS) access to a Circuit Switched (CS) access of a telecommunications session that has been established over the PS access via an IP Multimedia Subsystem (IMS) network, the method comprising: receiving a request for the transfer of the session to the CS access; obtaining, from the IMS network, an indication of an already-seized media gateway (MGW) that has been established for use in one or more other sessions over the CS access; selecting a MGW as a Mobile-Media Gateway (M-MGW) for the session based on the obtained indication; initiating allocation of resources for the session in the CS access network, including specifying the MGW to be used as the M-MGW; initiating transfer of the session to the CS access.