On 28.01.2020 14:43, Miha via Users wrote:
Costumer is saying that he expects from like it was send in 200ok (not
in inital invite, tag and CALLERID stays always the same) and we
should confirm with ACK that has from same as in 200 ok from them.
Hi miha,
That is complete nonsense, RFC 3261 is on your side, section § 8.2.6.2:
The From field of the response MUST equal the From header field of
the request. The Call-ID header field of the response MUST equal the
Call-ID header field of the request. The CSeq header field of the
response MUST equal the CSeq field of the request. The Via header
field values in the response MUST equal the Via header field values
in the request and MUST maintain the same ordering.
However, if you are really keen to help them out... maybe you could
store their
200 OK From header in a $dlg_val, then fix the ACK's From header to use
this val.
But how will you handle the From header for other sequential requests?
And if these
requests are initiated by the downstream side, you will have to change
the To instead
of the From, as the UAC must swap them! We are basically opening
Pandora's Box by
doing down this route. It's not impossible to get right, but it will
take some work.
Regards,
--
Liviu Chircu
www.twitter.com/liviuchircu | www.opensips-solutions.com
OpenSIPS Summit, Amsterdam, May 2020
www.opensips.org/events
OpenSIPS Bootcamp, Miami, March 2020
www.opensips.org/training
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