[Freeswitch-users] overriding default timer values

[Alex Balashov]

Yes.  You can see these options in the stock SIP profile configuration XML:

1)

     <!-- Initial retransmission interval (in milliseconds).
          Set the T1 retransmission interval used by the SIP transaction 
engine.
          The T1 is the initial duration used by request retransmission 
timers A and E (UDP) as well as response retransmission timer G.   -->
     <!-- <param name="timer-T1" value="500" /> -->

2)

    <!--  Transaction timeout (defaults to T1 * 64).
          Set the T1x64 timeout value used by the SIP transaction engine.
          The T1x64 is duration used for timers B, F, H, and J (UDP) by 
the SIP transaction engine.
          The timeout value T1x64 can be adjusted separately from the 
initial retransmission interval T1. -->
     <!-- <param name="timer-T1X64" value="32000" /> -->

3)
     <!-- Maximum retransmission interval (in milliseconds).
          Set the maximum retransmission interval used by the SIP 
transaction engine.
          The T2 is the maximum duration used for the timers E (UDP) and 
G by the SIP transaction engine.
          Note that the timer A is not capped by T2. Retransmission 
interval of INVITE requests grows exponentially
          until the timer B fires.  -->
     <!-- <param name="timer-T2" value="4000" /> -->

4)

    <!--
         Transaction lifetime (in milliseconds).
         Set the lifetime for completed transactions used by the SIP 
transaction engine.
         A completed transaction is kept around for the duration of T4 
in order to catch late responses.
         The T4 is the maximum duration for the messages to stay in the 
network and the duration of SIP timer K. -->
     <!-- <param name="timer-T4" value="4000" /> -->

-- Alex

On 12/18/2013 04:37 AM, Grant Bagdasarian wrote:

> Hello,
>
> The SIP RFC defines some timers and their default values.
>
> Is it possible to override these values in sip profiles or somewhere else?
>
> 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
>
>
>
> _________________________________________________________________________
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>
> 
> 
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-- 
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/