[SIPForum-discussion] which timer UAC start on 491 response ?

[Raj Jain]

On Fri, Jun 13, 2008 at 1:05 PM, Ivan, Martin <martin.ivan at siemens.com> wrote:
> Taken From 3261
>
> "If a UAC receives a 491 response to a re-INVITE, it SHOULD start a
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>    timer with a value T chosen as follows:
>
>
>
>       1. If the UAC is the owner of the Call-ID of the dialog ID
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>          (meaning it generated the value), T has a randomly chosen value
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>          between 2.1 and 4 seconds in units of 10 ms.
>
>
>
>       2. If the UAC is not the owner of the Call-ID of the dialog ID, T
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>          has a randomly chosen value of between 0 and 2 seconds in units
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>          of 10 ms."
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>
>
>
>
> Is randomly chosen value taken from interval of sip T2 timer which is 4s ?

No, this is an independent timer. The idea is that either sides should
back-off randomly in order to minimize the possibility of subsequent
RE-INVITE glares.

--
Raj Jain