Hello,
o Daniel Vukicevic on 07/26/2012 04:11 PM:
Hello,
i am experiencing problems with 3CX using SEMS in combination with
Kamailio as Authentication Proxy.
If i connect the 3CX with SEMS there is a problem in transmitting RTP
audio to 3CX, which is behind a natted firewall.
The firewall is not a problem. It is already tested with a soft client
and also in combination with Kamailio and Asterisk as B2BUA.
Everything worked fine with asterisk as Media Server.
I guess the problem is, when using tcpdump to analyze the RTP
Packages, that SEMs will send the packages to the internal
ip address of 3CX.
So finally using wireshark on the windows server, none of the packages
will arrive.
if you want to make SEMS send RTP to the address where the RTP is
coming from (comedia style)
- if the UA (3CX) can detect it is behind NAT, it can add
a=direction:active to the SDP
otherwise:
- for the sbc, set rtprelay_force_symmetric_rtp=yes
(see the RTP relay section in
http://ftp.iptel.org/pub/sems/doc/current/ModuleDoc_sbc.html , also
rtprelay_msgflags_symmetric_rtp=yes)
- for other applications, add a header
P-MsgFlags: 2
to the message as you send it to SEMS.
hth
Stefan
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