Appendix C Transaction Timers
Table C–1 SIP Transaction TimersTimer | Default Value | RFC 3261 Section | Meaning |
|---|---|---|---|
T1 | 500 milliseconds | 17.1.1.1 | RTT Estimate |
T2 | 4 seconds | 17.1.2.2 | Maximum retransmit interval for non-INVITE requests and INVITE responses |
T4 | 5 seconds | 17.1.2.2 | Maximum duration that a message remains in the network |
Timer A | T1 | 17.1.1.2 | INVITE request retransmit interval, for UDP only |
Timber B | 64*T1 | 17.1.1.2 | INVITE transaction timeout timer |
Timer C | > 3 minutes | 16.6 (bullet 11) | Proxy INVITE transaction timeout |
Timer D | > 32 seconds for UDP, 0 for TCP/SCTP | 17.1.1.2 | Wait time for response retransmits |
Timer E | T1 | 17.1.2.2 | Non-INVITE request retransmit interval, for UDP only |
Timer F | 64 * T1 | 17.1.2.2 | Non-INVITE transaction timeout timer |
Timer G | T4 for UDP, 0 for TCP/SCTP | 17.2.1 | INVITE response retransmit interval |
Timer H | 64 * T1 | 17.2.1 | Wait time for ACK receipt |
Timer I | T4 for UDP, 0 for TCP/SCTP | 17.2.1 | Wait time for ACK retransmits |
Timer J | 64 * T1 for UDP, 0 for TCP/SCTP | 17.2.2 | Wait time for non-INVITE request retransmits |
Timer K | T4 for UDP, 0 for TCP/SCTP | 17.1.2.2 | Wait time for response retransmits |
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