SIP in the 3GPP IP Multimedia Subsystem (IMS) - Extension


Enrique Vazquez


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The SIP-IMS model is an enhancement of the original SIP model provided  in the standard model library of OPNET Modeler to allow simulations  based on the IMS (IP Multimedia Subsystem). The model includes the IMS  session establishment mechanism (comprising UAS and UAC processes,  C-CSCF, P-CSCF and I-CSCF intermediaries, multidomain and roaming  support), as well as process’ delay control in intermediaries and  intermediaries’ redundancy.