[OpenSER-Users] port modification is sdp
Iñaki Baz Castillo
ibc at in.ilimit.es
Wed Oct 31 11:12:38 CET 2007
El Wednesday 31 October 2007 10:22:05 Konstantinos Koutsopoulos escribió:
> The NATted device (client B) is behind a USR 9112,
> the other machine (with openser and client B) is on an
> academic LAN. The fact, however, is that tshark indicates
> that the original sdp (from B) reaches port 5060 of openser
> but the invite that is thereafter forwarded to client A
> contains a modified sdp.
Not sure if I've understood, you said always "client B" XD
I assume client B calls from NAT. Is it a softphone?
Could you try with a softphone as B and do a ngrep o tshark in the **same**
machine B is running and notate the INVITE message?
Then you can do a ngrep in OpenSer and inspect the received INVITE form B.
If the NAT has been fixed "by magic" then your router (in B LAN) does ALG's,
so it rewrites the SIP message and replaces private IP with public IP and
internal ports with NAT mapped external ports.
--
Iñaki Baz Castillo
ibc at in.ilimit.es
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