RFC 3261 is explicit that the From and To headers in a response MUST be equal to those in the request, with the exception of the potential addition of a tag in the To header if not already present.
https://www.rfc-editor.org/rfc/rfc3261.html#section-8.2.6.2 Ben Newlin From: Users <[email protected]> on behalf of Johan De Clercq <[email protected]> Date: Wednesday, April 10, 2024 at 9:44 AM To: OpenSIPS users mailling list <[email protected]> Subject: [OpenSIPS-Users] on from and to header. EXTERNAL EMAIL - Please use caution with links and attachments ________________________________ This is more a protocol question then anything else. A sends a call B INVITE [email protected]<mailto:[email protected]> from: <sip:[email protected]:5060<http://sip:[email protected]:5060>>;tag=1 to: <sip:[email protected]<mailto:sip%[email protected]>> call-id: 1 ...... B responds with from and to in e164 format 200 OK from: <sip:[email protected]:5060<http://sip:[email protected]:5060>>;tag=1 to: <sip:[email protected]<mailto:sip%3A%[email protected]>>; tag=2 call-id: 1 My gut feeling says to me that A will not like this and hence that B should respong with A and B instead of +32A and +32B. But can somebody explain me why or why not? Best regards, Johan.
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