Thanks  everyone for the responses.

Brett,

Lets assume the expires value is 100. the Update/Invite will go after
50 seconds after message (3). right?

Thanks,

On Fri, Mar 27, 2015 at 4:59 PM, Brett Tate <br...@broadsoft.com> wrote:
>> The INFO can be out of dialog as well.
>
> INFO is a mid-dialog request.  RFC 6086 section 1.
>
> "Use of the INFO method does not constitute a separate dialog usage.
> INFO messages are always part of, and share the fate of, an invite
> dialog usage [RFC5057].  INFO messages cannot be sent as part of
> other dialog usages, or outside an existing dialog."
>
>
>> > I have a scenario where my phone has negotiated with server
>> > as 60 seconds expires and UAC as refreshers.
>
> For completeness, I should mention that the negotiated value is below the
> absolute minimum mentioned within RFC 4028 section 4.
>
> "The absolute minimum for the Session-Expires header field is 90 seconds."
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