Assuming you mean over the same "potential" call-leg,
section 5.1 bis-04 says return a 400 with a retry-after.
This is because it potentially will lead to SDP
confusion when invites collide.
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Romel Khan
> Sent: Thursday, August 09, 2001 3:09 PM
> To: 'Ramachandran Iyer'; Romel Khan;
> '[EMAIL PROTECTED]'
> Subject: RE: [Sip-implementors] re-invite
>
>
> But UAS can send re-invite. I am not talking about sending
> responses from
> UAS.
> Let me repharse what I asked:
> WHAT WILL HAPPEN IF UAS RESPONDS BACK WITH AN INVITE WITH THE
> SAME CALL_ID
> after the UAS receives an Invite from an UAC.
>
> Thanks.
>
> Romel Khan
> Ph: (732)-363-0213, x241
>
> Thanks.
>
> Romel Khan
> Ph: (732)-363-0213, x241
>
>
> -----Original Message-----
> From: Ramachandran Iyer [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, August 09, 2001 3:03 PM
> To: Romel Khan; '[EMAIL PROTECTED]'
> Subject: Re: [Sip-implementors] re-invite
>
>
> I am not very sure of what your concern is:
>
> First when UAS gets a INVITE it usually responds
> back with a provisional/ final response...
>
> It is in case if there was no such response from the
> UAS.. then the UAC will keep resending the INVITE
> which would actually be called as the re-INVITE, which
>
> would be sent for a max of 7 times (32s, for UDP)..
>
>
> So the UAS cannot send a re-INVITE..as a response to
> the INVITE.. there could be a case where before the
> INVITE reaches the UAS.. the UAS (which in this case
> becomes a client) has already originated a INVITE to
> the same party which has already issued an INVITE..so
> as to say that both INVITE crosses on the wire, still
> it would not be termed as a re-INVITE and obviously it
> will have a different call-id.. In such a case both
> will get a response of ..other party being busy.
>
>
> Rama
>
>
>
> --- Romel Khan <[EMAIL PROTECTED]> wrote:
> > Consider the scenario:
> > UAC sends Invite to UAS. Upon receiving the Invite,
> > the UAS then right away
> > sends a re-invite (i.e. same call-ID) to UAC (with
> > no responses in between).
> > Is this situation allowed? Why should this situation
> > be allowed? Where would
> > usage of such a scenario make sense?
> >
> > Thanks.
> >
> > Romel Khan
> > Ph: (732)-363-0213, x241
> >
> >
>
>
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