> 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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