Appendix C
Transaction Timers
Table C-1 SIP Transaction Timers
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|
|
|
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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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