[Freeswitch-users] NAT traversal: replacing rttproxy with external RTP IP address in FS

[Kamil Nigmatullin]

As far as i know fs does not change sdp when bypass media is set to true?
Have you checked that?
 06 февр. 2015 г. 6:54 пользователь "Ben Hood" <0x6e6562 at gmail.com> написал:

> Hi all,
>
> TL;DR: Does anybody know of a way to convince FS to insert an external
> RTP IP into the SDP even if the signalling is coming from a client
> behind the same NAT?
>
> I'm currently using kamailio and rtpproxy behind a NAT in conjunction
> with FS, but I'd like to eliminate rtpproxy from the equation and get
> FS to handle all of the RTP NAT.
>
> I've set the ext-rtp-ip in the SIP profile and FS seems to have
> accepted it, but FS still sends out SDPs with the local IP address in
> them.
>
> I'm assuming that this is happening because the client that is
> forwarding the INVITE is behind the same NAT and therefore FS is not
> inserting the external IP address into the SDP, but I might be wrong.
>
> I'm using version 1.4.15-1.
>
> Currently I've got this topology for signalling:
>
> CLIENT <-> PUBLIC INTERNET <-> NAT <-> KAMAILIO <-> FS
>
> And this topology for media:
>
> CLIENT <-> PUBLIC INTERNET <-> NAT <-> RTPPROXY <-> FS
>
> whereby rttproxy advertises itself on a public IP and the external
> firewall has static port forwards set up for ephemeral RTP ports.
>
> FS is a B2BUA in this setup.
>
> I'd like to replace the media topology with this:
>
> CLIENT <-> PUBLIC INTERNET <-> NAT <-> FS
>
> and port forward RTP to the FS instance in the firewall.
>
> As a proof of concept hack, I was able to get end to end media going
> between two different clients, by rewriting the local IP of the FS
> instance in the outgoing SDP on the outbound leg in kamailio.
>
> But I'd like to be able to set the correct external IP as part of the
> normal SDP patching process in FS.
>
> Thanks,
>
> Ben
>
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