[SR-Users] CANCEL before INVITE

[Andrei Pelinescu-Onciul]

On Jun 17, 2010 at 16:39, David <kamailio.org at spam.lublink.net> wrote:
> Hello,
> 
> I had a look at RFC 3261, section 9.1. The trouble is that Kamailio
> is answering "100 Trying" to the caller, so the it is ok for the
> caller to send back a CANCEL request. Trouble is Kamailio forwards
> the request to the called user even though the called user never
> sent a provisional response.
> 
> Since the Kamailio server never received a provisional request, it
> is therefore incorrect for it to forward the CANCEL request to the
> called user. ( correct me if I am wrong ).

Try 3.0 (kamailio or sip-router). You can control how unreplied branches
are canceled, see
http://sip-router.org/docbook/sip-router/branch/master/modules/tm/tm.html#cancel_b_method


Andrei