Session Initiation Protocol (SIP) has been increasingly used as a signaling protocol to establish call sessions for the lnternet telephony in recent years. SIP often uses UDP as its transport layer for the end-to-end communication. For reliable transm...
Session Initiation Protocol (SIP) has been increasingly used as a signaling protocol to establish call sessions for the lnternet telephony in recent years. SIP often uses UDP as its transport layer for the end-to-end communication. For reliable transmission over UDP, SIP retransmits the message when a transmitted message is lost. This retransmission of the message will increase load and can cause overload on the SIP proxy servers. Yang et al. suggested a linear overload control algorithm for a SIP proxy server when incoming traffic exceeds its capability. This paper performs some simulation studies for optimizing the parameters used for the algorithm to improve its performance. From the simulation results, we can find that the Yang’s algorithm can be improved by 15% or so with the optimized parameters compared to its unoptimized one.