Impact of Retransmission Mechanism on SIP Overload: Stability Condition and Overload Control
SIP (Session Initiation Protocol) has been widely adopted as a signaling protocol to establish, modify and terminate media sessions between end-users in the Internet. SIP introduces a retransmission mechanism to ensure the reliability of its real-time message delivery. However, retransmission can make server overload worse, leading to server crashes in SIP-based carrier networks (e.g. Skype). In order to study the impact of retransmission mechanism on SIP overload, in this paper, the authors create a discrete time fluid model to describe the queuing dynamics of an overloaded SIP server.