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What are SIP timers and how are they used?

edited Mar 21, 2013 11:48AM in Acme Packet (MOSC) 4 commentsAnswered

SIP timers define the transaction expiration timers, retransmission intervals when UDP is used as a transport, and the lifetime of dynamic TCP connections. The retransmission and expiration timers correspond to the timers defined in RFC 3261.

init timer: The initial request retransmission interval. It corresponds to Timer T1 in RFC 3261.
This timer is used when sending requests over UDP. If the response is not received within this interval, the request is retransmitted. The retransmission interval is doubled after each retransmission.

max timer: The maximum retransmission interval for non-INVITE requests. It corresponds to Timer T2 in RFC 3261. The retransmission interval is doubled after each retransmission. If the resulting retransmission interval exceeds the max timer, it is set to the max timer value.

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