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The 3rd generation partnership project (3GPP) and 3GPP2 have standardized the IP multimedia subsystem (IMS) to provide ubiquitous and access network independent IP-based services for next generation networks via merging cellular networks and the Internet. The application layer Session Initiation Protocol (SIP), standardized by 3GPP and 3GPP2 for IMS, is responsible for IMS session establishment, management,...
As we all know push-to-talk service implemented in the cellular network has deeply enhanced the advantages of traditional Walkie-Talkie service without the limitation of distance. In order to enrich the multimedia network communication, we have tried to deploy the PoC service into the IMS service delivery platform (SDP). Related work we have done is to simulate PoC service in IP multimedia subsystem...
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