WAS v8.5 > Reference > Developer detailed usage informationSIP timer summary
Request for Comments (RFC) 3261, "SIP: Session Initiation Protocol," specifies various timers that SIP uses.
Table 1 summarizes for each SIP timer the default value, the section of RFC 3261 that describes the timer, and the meaning of the timer.
SIP timers." id="rsip_reftimesumm__table_timers" border=1 > Summary of SIP timers. This table lists a summary of SIP timers.
Timer Default Section Meaning T1 500 ms 17.1.1.1 Round-trip time (RTT) estimate T2 4 sec. 17.1.2.2 Maximum retransmission interval for non-INVITE requests and INVITE responses T4 5 sec. 17.1.2.2 Maximum duration that a message can remain in the network Timer A initially T1 17.1.1.2 INVITE request retransmission interval, for UDP only Timer B 64*T1 17.1.1.2 INVITE transaction timeout timer Timer D > 32 sec. for UDP 17.1.1.2 Wait time for response retransmissions 0 sec. for TCP and SCTP Timer E initially T1 17.1.2.2 Non-INVITE request retransmission interval, UDP only Timer F 64*T1 17.1.2.2 Non-INVITE transaction timeout timer Timer G initially T1 17.2.1 INVITE response retransmission interval Timer H 64*T1 17.2.1 Wait time for ACK receipt Timer I T4 for UDP 17.2.1 Wait time for ACK retransmissions 0 sec. for TCP and SCTP Timer J 64*T1 for UDP 17.2.2 Wait time for retransmissions of non-INVITE requests 0 sec. for TCP and SCTP Timer K T4 for UDP 17.1.2.2 Wait time for response retransmissions 0 sec. for TCP and SCTP
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