Other commonly used example is MOH .Where UE putting call on hold sends
INVITE no sdp  to Music server .
As Brett mentioned mostly its used in 3PCC .

On Wed, Dec 17, 2014 at 5:36 PM, Brett Tate <br...@broadsoft.com> wrote:
>
> RFC 3725 shows the 3PCC usage.
>
> > -----Original Message-----
> > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
> > implementors-boun...@lists.cs.columbia.edu] On Behalf Of Seshagiri
> > Kondaveti
> > Sent: Tuesday, December 16, 2014 11:37 PM
> > To: sip-implementors@lists.cs.columbia.edu
> > Subject: [Sip-implementors] Use case for Inivite without SDP
> >
> >
> > Hi all,
> >
> > What is the use case for Inivite without SDP ?
> >  I see most of the softphones sends out invite with SDP but don’t know
> > when
> > to use invite without SDP.
> >
> > Request you to share your experience.
> >
> > Regards
> > Sesh
> >
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