[SR-Users] CANCEL before INVITE

[Iñaki Baz Castillo]

2010/6/17 Andrei Pelinescu-Onciul <andrei at iptel.org>:
> 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


A question about case 2:

-----------
2 will send and retransmit CANCEL even on unreplied branches, stopping
the request retransmissions. This has the same advantages as 1 and
also avoids the extra roundtrip in the case of the provisional reply,
but it's not RFC 3261 conforming (the RFC allows sending CANCELs only
on pending branches).
------------

What about if the UAS replies a 200 before the CANCEL arrives to it?
Would TM route the 200 upstream to the UAC? or would TM absorb it?


-- 
Iñaki Baz Castillo
<ibc at aliax.net>