[SR-Users] B2BUA removing a=nortpproxy:yes (rtpproxy-1 <---RTP---> rtpproxy-2)

[Alex Balashov]

Iñaki,

I would be curious to know what practical circumstances demand such a  
convoluted topology.

--
Alex Balashov - Principal
Evariste Systems LLC
1170 Peachtree Street
12th Floor, Suite 1200
Atlanta, GA 30309
Tel: +1-678-954-0670
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On Apr 24, 2010, at 5:48 AM, Iñaki Baz Castillo <ibc at aliax.net> wrote:

> 2010/4/24 Juha Heinanen <jh at tutpro.com>:
>> Iñaki Baz Castillo writes:
>>
>>>   1.6.4.  force_rtp_proxy([flags [, ip_address]])
>>  >
>>  >     -r   flags that IP address in SDP should be trusted. Without  
>> this
>>  > flag, nathelper
>>  >          ignores address in the SDP and uses source address of the
>>  > SIP message
>>  >          as media address which is passed to the RTP proxy.
>>
>> i don't understand what chaining of rtpproxies has to do with  
>> trusting
>> of ip addresses.  my proxy can receive a request from anyone from the
>> internet and if that someone is behind nat and his proxy happens to  
>> use
>> rtpproxy, then chaining with my rtpproxy does not work if some kind  
>> of
>> trust relationship between these two proxies is needed.
>
> If these rtpproxy use the same IP as the Kamailio's SIP signalling IP,
> then there is no problem and no need to use "-r" flag. But my case is
> more exotic as there is a transparent proxy between Kamailio-1 and
> Kamailio-2, each one with its own RtpProxy not listening in same IP as
> its Kamailio, and thre is also a transaparent SIP proxy between them
> which, for some reason, removes the line "a=nortpproxy". In this case
> both RtpProxy would handle the media and a deadlock would occur if
> flag "-r" is not used because after some timeout both RtpProxy would
> start relaying RTP to the IP of the transparent proxy (the prefilled
> address when not using "-r" flag).
>
> I've checked it.
>
>
>
> -- 
> Iñaki Baz Castillo
> <ibc at aliax.net>
>
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