[OpenSIPS-Users] fix_nated_sdp and rtpproxy

Bogdan-Andrei Iancu bogdan at opensips.org
Thu Nov 16 07:32:30 EST 2017

Hi Yury,

Why do you need to update the incoming SDP before engaging RTPproxy ? 
Just pass to it whatever you get into SDP (even if private) and let 
rtpproxy to "learn" the correct IP:port of the media end points based on 
the incoming traffic.


Bogdan-Andrei Iancu
   OpenSIPS Founder and Developer

On 11/14/2017 04:05 AM, Yury Kirsanov wrote:
> Hi,
> I have a problem with remote client who can't properly configure NAT 
> and is sending private IP in all SDP and SIP packets. I've resolved 
> issues with registration but can't resolve the issue with SDP. My 
> topology is as following:
> <Client> ----- <NAT router> ------- <RTP Proxy> ---------- <OpenSIPS> 
> -------- <NAT> ----------- <PBX>
> So, I need to simultaneously engage RTP Proxy to bridge external 
> Internet and our local LAN and need to rewrite SDP body of original 
> Client's packet with received IP address. If I'm doing fix_nated_sdp 
> and then rtpproxy_offer - I'm getting doubled IPs in SDP message, like 
> this:
> Is there any way to update SDP of client's packet and then command RTP 
> Proxy to use updated IP? Thanks!
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