Patent ID: 8483182

Claim:
A method of performing a handover with Single Radio Voice Call Continuity, SRVCC, of a telecommunications session from a User Equipment, UE accessing an IP Multimedia Subsystem, IMS, network via a Circuit Switched, CS, access network to a target Packet Switched, PS, access network, the method comprising: prior to a handover request regarding the UE, notifying the CS access network by a communication from the UE of the UE's ability to perform a CS to PS handover with SRVCC for both the data media and any audio media in the telecommunications session; receiving the handover request by the target PS access network from the CS access network to transfer the telecommunications session; determining that the telecommunications session comprises data media in addition to, or without, any audio media; determining the ability to perform the handover with SRVCC for the data media; allocating bearer resources for the telecommunications session in response to being handed over to the PS access network, the bearer resources including a data media bearer and, responding to the presence of any audio media in the telecommunications session by further allocating an audio media bearer; and transferring the telecommunications session from the CS to the target PS access network.