[OpenSER-Users] "200 OK" not SDP fixed by RtpProxy... but it works ! ¿?

[Iñaki Baz Castillo]

Hi, user_A with STUN calls to user_B behind NAT with no STUN.

onreply_route[1] {
    if (nat_uac_test("1"))
        fix_nated_contact();
    if (isbflagset(6) && status=~"(180)|(183)|2[0-9][0-9]")
        force_rtp_proxy("l");
}

In the initial request bflag(6) is up because "location" of user_B so RtpProxy 
is used in the INVITE and 200-OK.

But in re-INVITE bflag(6) is down and is not applied force_rtp_proxy("l"); in 
the 200-OK.

In fact I debug the SIP trace in the re-INVITE in OpenSer:

----------------------------------------------------------------------
# user_A -> OpenSer
INVITE sip:user_B at 112.121.235.28:5061 SIP/2.0
  c=IN IP4 212.121.235.18


# OpenSer -> user_B
INVITE sip:806 at 212.121.235.18:5061 SIP/2.0
  c=IN IP4 80.94.0.110   <---- RtpProxy applied (OK)


# user_B -> OpenSer
SIP/2.0 200 OK
  c=IN IP4 192.168.1.106  [*1]
    *1: Needs RtpProxy but bflag(6) is down so not applied.


# OpenSer -> user_A
SIP/2.0 200 OK
  c=IN IP4 192.168.1.106  <-- RtpProxy NO applied
----------------------------------------------------------------------


But I can confirm that the audio works after re-INVITE in both directions!!! 
¿?
I've debugged with tcpdump, the RTP is send to RtpProxy from user_A, how is 
possible??


Thanks.


-- 
Iñaki Baz Castillo
ibc at in.ilimit.es