Johan, is there also a PRACK happening in this call flow, but omitted from your diagram? The SDP offer/answer model is extended a bit by reliable provisional response messages.
The Offer/Answer Model and PRACK https://datatracker.ietf.org/doc/html/rfc3262#section-5 Calvin Ellison Systems Architect [email protected] +1 (213) 285-0555 <http://voxox.com> <https://www.facebook.com/VOXOX/> <https://www.instagram.com/voxoxofficial/> <https://www.linkedin.com/company/3573541/admin/> <https://twitter.com/Voxox> The information contained herein is confidential and privileged information or work product intended only for the individual or entity to whom it is addressed. Any unauthorized use, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me immediately. On Fri, Oct 1, 2021 at 8:07 AM johan <[email protected]> wrote: > Scenario is this > > > A ---> OPENSIPS and rtpengine -----> B > > INV -> > INV > > 183 sdp < <183 sdp > > < 480 > > > -------------------------------------------------> Voicemail > > > INV > > < 200 with diff sdp > > 200 with diff sdp < > > would giving rtpengine the port latching option fix this ? > > > wkr, > On 1/10/2021 16:41, Ben Newlin wrote: > > No, this is not allowed by the specification, though some devices do > handle it. > > > > https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1 > > > > Ben Newlin > > > > *From: *Users <[email protected]> > <[email protected]> on behalf of johan <[email protected]> > <[email protected]> > *Date: *Friday, October 1, 2021 at 10:35 AM > *To: *OpenSIPS users mailling list <[email protected]> > <[email protected]> > *Subject: *[OpenSIPS-Users] question on call handling. > > Dears, > > > this is more a general sip question. when establishing a dialog is it > then allowed to change the sdp that you have sent in 183 to somehting > else in 200 Ok ? > > > wkr, > > > _______________________________________________ > Users mailing list > [email protected] > http://lists.opensips.org/cgi-bin/mailman/listinfo/users > > _______________________________________________ > Users mailing > [email protected]http://lists.opensips.org/cgi-bin/mailman/listinfo/users > > _______________________________________________ > Users mailing list > [email protected] > http://lists.opensips.org/cgi-bin/mailman/listinfo/users >
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