[Kamailio-Users] Having problems using RTPProxy to bridge internal/external networks

[Klaus Darilion]

never call both functions. That will not work (you see the result)

when using the correct parameters (flags), force_rtpproxy() should be 
able to fix the SDP correctly

regards
klaus

Örn Arnarson wrote:
> Hi Klaus,
> 
> I've gathered as much; I'm able to bridge between the interfaces, but
> if I do that, I can't rewrite the SDP properly. I can only rewrite the
> SDP by using fix_nated_sdp. If I use fix_nated_sdp and the rtpproxy
> functions to bridge the call, the SDP gets messed up.
> E.g. I rewrite the media address with fix_nated_sdp from the public
> IP, 157.157.x.x to 10.252.1.8, but if I then call the force_rtp_proxy
> function, it just appends the public IP address directly behind the
> 10.252.1.8 IP address, so the SDP media address is now
> 10.252.1.8157.157.x.x.
> 
> Any ideas?
> 
> Regards,
> Örn
> 
> On Thu, Oct 15, 2009 at 12:30 AM, Klaus Darilion
> <klaus.mailinglists at pernau.at> wrote:
>> I think it is not about offer/answer, but you have to call rtpproxy*
>> functions with  the proper parameter to activate bridging inside rtpproxy.
>>
>> E.g. there is an (I guess rather old) example for ipv4 to ipv6 bridging, but
>> from the logic it should be similar to v4:v6 bridging:
>> http://openser.svn.sourceforge.net/viewvc/openser/trunk/modules/nathelper/examples/4to6.cfg?revision=2&view=markup
>>
>> Take a look at the i and e flag:
>> http://kamailio.org/docs/modules/1.5.x/nathelper#id2468157
>>
>> regards
>> klaus
>>
>> Joe Hart wrote:
>>> Hi all,
>>>
>>> For a project on which I'm currently working, I am having some problems
>>> figuring out how to correctly configure Kamailio to communicate with RTP
>>> Proxy in order to send media into and out of a network with private IP
>>> address ranges.
>>>
>>> I have a proxy set up to send the SIP traffic, and all of this is working
>>> fine.  However, I'm having some trouble getting the RTP Proxy set up.
>>>  Currently, when the call is connected, the offer/answer is made and RTP
>>> Proxy seems to be taking over, but I'm having trouble getting my audio to
>>> flow in both directions.
>>>
>>> Examination of the traffic coming into and out of this machine seems to
>>> indicate that the IP addresses aren't being mangled correctly. Specifically,
>>> it appears the internal IP address isn't being changed to reflect the IP
>>> address of the machine on which RTP Proxy is running, so that when the
>>> caller tries to send audio back, the IP it's given to reply to is 10.10.x.x,
>>> which obviously won't work.
>>>
>>> I have tried experimenting with specifically setting IP addresses in the
>>> rtpproxy_offer() and _answer() methods to no avail, as well as setting
>>> various flags in those methods.  However, I must admit that I'm not entirely
>>> sure what's happening under the hood with these methods, or what rtpproxy is
>>> doing with that information when it gets it.  Rather than continue to hack
>>> at this by trial and error, I'm hoping someone here can point me in the
>>> right direction.
>>>
>>> Any advice, example code or pep talks would be greatly appreciated.
>>>
>>> Thanks in advance,
>>>
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