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.

互联网协议语音 (VoIP) 的特点是基于会话发起协议 (SIP) 的会话控制信令的增长。越来越多的 SIP 信令可能会导致 VoIP 会话控制基础设施过载和服务质量下降。为了减少过载条件的影响，我们研究了 SIP 消息区分对 VoIP 会话控制程序质量的影响。我们提出了一种 SIP 消息优先级算法，并在不同条件下使用 Kamailio SIP 服务器对其进行了测试。总结我们的研究结果，所提出的算法改进了与 VoIP 会话控制程序相关的性能指标。