[OpenSIPS-Users] RTPProxy for users behind NAT.

[Răzvan Crainea]

Hi, Qasim!

There are two problems with your approach: the first one is that you are 
using the engage_rtp_proxy() function in a bridging mode scenario. The 
behavior of this is undefined, because the rtpproxy module cannot fully 
determine your scenario (for example what's the direction of the media 
flow in the reply). That's why you should use the rtpproxy_offer() and 
rtpproxy_answer() functions to explicitly indicate the direction in 
INVITE and replies.
The second problem is that you try to change the SDP twice: first by the 
fix_nated_sdp() and then by engage_rtp_proxy(). These changes confuse 
OpenSIPS, who tries to apply both of them. Try to use only one. My 
suggestion is to rtpproxy_offer/answer() to fix the SDP, without calling 
fix_nated_sdp().

Best regards,

Razvan Crainea
OpenSIPS Core Developer
http://www.opensips-solutions.com

On 05/09/2013 02:33 PM, Nick Khamis wrote:
> It's not a bug, many of us here use RTP proxy in the same scenario.
> Can you please provide a sip trace using ngrep
> (http://wiki.freeswitch.org/wiki/Packet_Capture). Secondly, post the
> relevant far end nat related scripting please.
>
>
> Nick.
>
> On 5/9/13, qasimakhan at gmail.com <qasimakhan at gmail.com> wrote:
>> Hi,
>>
>> I am facing a problem when a client connects to opensips from NATed
>> network. I am using rtpproxy in bridging mode i.e. from publicnetwork to
>> private network. When i use fix_nated_sdp function from nathelper the local
>> IP address of the caller is replaced by its public IP but the problem
>> starts when i use engage_rtp_proxy instead of replacing server's public ip
>> to private it embeds private ip after the caller's publicIP like
>> X.X.X.XY.Y.Y.Y. I have tried fix_nated_ip with flag 3 and engage_rtp_proxy
>> with flag rie.
>>
>> The question is am i using something wrong here or should it be counted as
>> a bug.
>>
>> If you want some more clarification can draw a flow diagram also.
>>
>> Regards,
>> Qasim
>>
>
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