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]> on behalf of johan <[email protected]> Date: Friday, October 1, 2021 at 10:35 AM To: OpenSIPS users mailling list <[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
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