Hi Daniel,

I see that call-id (and other dialog identifiers) matching are controlled by configuration but not IP:Port in via. It's hard-coded in via_matching() called from matching_3261().

Thanks,
-volkan

On Fri, Jun 5, 2015 at 9:49 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:
Hello,


the cancel is matched based on via branch value or the other tokens in the request (callid, cseq, ...). If you want to restrict on matching by source ip/port, you have to do it in the configuration file.

I guess that gives you what you need by default.

Cheers,
Daniel


On 04/06/15 21:22, Volkan Hatem wrote:
Hi All,

I searched list archives and have not seen a discussion on this issue.

According to 3261, CANCEL transaction matching follows the rules listed in section 17.2.3:

[...snip...]
      1. the branch parameter in the request is equal to the one in the
         top Via header field of the request that created the
         transaction, and

      2. the sent-by value in the top Via of the request is equal to the
         one in the request that created the transaction, and
[...snip...]

However, according to RFC 6141 (which I don't think kamailio implemented yet) suggests generating a CANCEL request (UAC) after losing contact (section 5.5):

[...snip...]

   When a UAC moves to a new contact and loses its old contact, it will
   not be able to receive responses to the re-INVITE.  Consequently, it
   will never generate an ACK request.

   Such a UAC SHOULD generate a CANCEL request to cancel the re-INVITE
   and cause the INVITE client transaction corresponding to the
   re-INVITE to enter the "Terminated" state.  The UAC SHOULD also send
   a new re-INVITE in order to make sure that both UAs have a common
   view of the state of the session.
[...snip...]

My interpretation is that sent-by comparison is ruled out because clearly IP:PORT will not match anymore.

Do you think this is the right interpretation?

Is there a plan to implement RFC 6141?

Regards,
-volkan


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-- 
Daniel-Constantin Mierla
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