Thank you Olle! I’ll discuss this with our supplier.

From: sr-users [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Olle E. Johansson
Sent: Monday, April 4, 2016 10:16 AM
To: Kamailio (SER) - Users Mailing List <sr-users@lists.sip-router.org>
Subject: Re: [SR-Users] Kamailio 4.3.4: receive_msg(): no via found in reply

On 04 Apr 2016, at 10:02, Grant Bagdasarian <gb@cm.nl> wrote:

Hi Daniel,

You mentioned below about this issue not being complaint with the RFC.

Our supplier is telling us this is normal behavior and that they went through the RFC and found this was normal behavior.

If it’s not too much work, could you tell me in which part of the RFC this is described?

8.2.6.2 Headers and Tags

   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.

RFC 3261 basics. The UAS copies ALL Via:s from the request into the response. This is how we route responses through

a SIP network, so without all headers, communication will likely be very broken.

/O