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List:       sip-implementors
Subject:    Re: [Sip-implementors] Query on UAC Non Invite trasaction retransmission
From:       "A C Sathish-a22713" <sathishac () motorola ! com>
Date:       2007-07-19 13:20:34
Message-ID: ACCC36A6A87F6F4090F816DA8BE86653D88D53 () ZMY16EXM66 ! ds ! mot ! com
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Thanks for the clarification.
-Regards,
Sathish 

-----Original Message-----
From: Robert Sparks [mailto:rjsparks@nostrum.com] 
Sent: Wednesday, July 18, 2007 9:19 PM
To: A C Sathish-a22713
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Query on UAC Non Invite trasaction
retransmission

The receipt of the 100 trying resets Timer E to T2 no matter where you
are in the progression of doubling previous values of Timer E.

It might help to read about how this harms non-invite transactions -
there is a normative update to 3261 that makes that 100 trying not legal
until timer E would have been set to T2 anyhow. See RFCs 4320 and 4321.

RjS

On Jul 18, 2007, at 9:20 AM, A C Sathish-a22713 wrote:

> All,
>     I have a query in the below scenario, Considering UAC is 
> configured with T1 =500ms and T2=4s.
>     UAC  sends BYE to SIP Server and SIP Server responds with 100 
> Trying only.
> In this case when UAC is supposed to retransmit the BYE ?
>
> Is it at T1 or T2 interval ?
>
> Below two sections indicates different behaviour .can any one clarify 
> ?
>
> As per RFC 3261
>  17.1.2.1 Says
>     "If a provisional response is received, retransmissions
>    continue for unreliable transports, but at an interval of T2 "
>
> 17.1.2.2 "   If Timer E fires while in the "Proceeding" state, the
> request MUST be
>    passed to the transport layer for retransmission, and Timer E MUST 
> be
>    reset with a value of T2  
> seconds."                           { Timer
> E will be set to T1 }
>
>
> Regards,
> -Sathish
>
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> Sip-implementors@lists.cs.columbia.edu
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