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[Abstract]: The 3rd Generation Partnership Project (3GPP) uses the\udIETF Session Initiation Protocol (SIP) as a signalling protocol in the IP Multimedia Subsystem for 3rd generation UMTS networks. Signalling Messages sent using the SIP protocol pass through intermediate SIP nodes in such a way that the message size grows as a result of additional\uddata being added to the message. Modelling of network \udflows in this case requires careful attention. A simple \udflow model is presented to get an appreciation for the size of the expected signalling flows. This is particularly\udimportant for developing dimensioning models for SIP in 3GPP\udnetworks and for the further investigation of Quality of Service (QoS) mechanisms to provide resources needed for signalling. A methodology is presented which defines the minimum requirements for the bit error rate on links used by signalling traffic

A Simple Model for Calculating SIP Signalling Flows in 3GPP IP Multimedia Subsystems