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 on behalf of Johan De Clercq
Date: Wednesday, April 10, 2024 at 9:44 AM
To: OpenSIPS users mailling list
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@5.6.7.8<mailto:B@5.6.7.8>
from: http://sip:A@1.2.3.4:5060>>;tag=1
to: mailto:sip%3AB@5.6.7.8>>
call-id: 1
..
B responds with from and to in e164 format
200 OK
from: http://sip:+32A@1.2.3.4:5060>>;tag=1
to: mailto:sip%3A%2B32B@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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