Amit - can you describe what the purpose of doing it would be for?  That may 
help find a solution to your problem. (and I assume you meant RFC 3680 ;)
There are some non-standard tricks people use to do this, depending on what you 
need it for.

-hadriel

> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:sip-
> [EMAIL PROTECTED] On Behalf Of Paul Kyzivat
> Sent: Friday, May 09, 2008 9:50 AM
> To: Amit P. Ahuja
> Cc: [email protected]
> Subject: Re: [Sip-implementors] Forcing Clients/Phone to re REGISTER prior
> to "Expires" timeout
>
>
>
> Amit P. Ahuja wrote:
> > Hello List Members,
> >     Using only methods described in RFC3261 is there any way for a Sip
> > Server to force a Client to re-REGISTER prior to the timeout period set
> > during the REGISTER-200 OK transaction? I did see RFC3580 describing a
> > procedure to Forcing Re-Authentication however I wanted to enquire
> whether
> > it can be done with 3261 only ?
>
> No. Using only 3261 mechanisms there is no way for the registrar to
> communicate this desire to the UA. The next time the UA does send a
> REGISTER the registrar may reduce the timeout. But until the UA sends
> the REGISTER there is nothing the registrar can do.
>
>         Paul
>
> > Thanks and Regards,
> > Amit Ahuja
> >
> >
> > _______________________________________________
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> >
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