[OpenSIPS-Users] on from and to header.

[Ben Newlin]

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 <users-bounces at lists.opensips.org> on behalf of Johan De Clercq <Johan at democon.be>
Date: Wednesday, April 10, 2024 at 9:44 AM
To: OpenSIPS users mailling list <users at lists.opensips.org>
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 B at 5.6.7.8<mailto:B at 5.6.7.8>
from: <sip:A at 1.2.3.4:5060<http://sip:A@1.2.3.4:5060>>;tag=1
to: <sip:B at 5.6.7.8<mailto:sip%3AB at 5.6.7.8>>
call-id: 1
......

B responds with from and to in e164 format
200 OK
from: <sip:+32A at 1.2.3.4:5060<http://sip:+32A@1.2.3.4:5060>>;tag=1
to: <sip:+32B at 5.6.7.8<mailto:sip%3A%2B32B at 5.6.7.8>>; 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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