Abstract
Voice over Internet Protocol (VoIP) is characterized by the growth of session control signalling, which is based on the Session Initiation Protocol (SIP). The growing amount of SIP signalling may cause an overload of VoIP session control infrastructure and quality of service degradation. To reduce the effect of overload conditions, we studied the impact of SIP message differentiation on the quality of VoIP session control procedures. We proposed an algorithm for SIP message prioritization and tested it with Kamailio SIP server under different conditions. Summarizing our research findings, the proposed algorithm improves the performance metrics related to VoIP session control procedures.
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