RFC3261: SIP:计时器值表

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原文链接：https://www.ietf.org/rfc/rfc3261.html

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本文档概述了一个技术规格中使用的各种定时器的意义和默认设置，包括RTT估计、请求重传间隔、交易超时等，涉及INVITE请求、响应和非INVITE操作的网络行为参数。

A Table of Timer Values

   Table 4 summarizes the meaning and defaults of the various timers used by this specification.

Timer    Value            Section               Meaning
----------------------------------------------------------------------
T1       500ms default    Section 17.1.1.1     RTT Estimate
T2       4s               Section 17.1.2.2     The maximum retransmit
                                               interval for non-INVITE
                                               requests and INVITE
                                               responses
T4       5s               Section 17.1.2.2     Maximum duration a
                                               message will
                                               remain in the network
Timer A  initially T1     Section 17.1.1.2     INVITE request retransmit
                                               interval, for UDP only
Timer B  64*T1            Section 17.1.1.2     INVITE transaction
                                               timeout timer
Timer C  > 3min           Section 16.6         proxy INVITE transaction
                           bullet 11            timeout
Timer D  > 32s for UDP    Section 17.1.1.2     Wait time for response
         0s for TCP/SCTP                       retransmits
Timer E  initially T1     Section 17.1.2.2     non-INVITE request
                                               retransmit interval,
                                               UDP only
Timer F  64*T1            Section 17.1.2.2     non-INVITE transaction
                                               timeout timer
Timer G  initially T1     Section 17.2.1       INVITE response
                                               retransmit interval
Timer H  64*T1            Section 17.2.1       Wait time for
                                               ACK receipt
Timer I  T4 for UDP       Section 17.2.1       Wait time for
         0s for TCP/SCTP                       ACK retransmits
Timer J  64*T1 for UDP    Section 17.2.2       Wait time for
         0s for TCP/SCTP                       non-INVITE request
                                               retransmits
Timer K  T4 for UDP       Section 17.1.2.2     Wait time for
         0s for TCP/SCTP                       response retransmits

                   Table 4: Summary of timers

表4：计时器摘要