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

Alex Balashov abalashov at evaristesys.com
Thu Oct 15 19:58:54 CEST 2009

Alex Balashov wrote:
> Daniel-Constantin Mierla wrote:
>> IIRC, I use:
>> if(dst_ip==private_ip)
>>       force_rtp_proxy("ocfaei");
>> else
>>       force_rtp_proxy("ocfaie");
>> rtpproxy started with: -l external_ip/private_ip
>> Probably is rtpproxy 1.1 -- cannot check right now.
> I just tried this and it works, from the point of view of SDP.  We were 
> already able to obtain this result.
> The problem is that the actual rtpproxy does not seem to forward the 
> packets that come into one interface toward the other, so no media is 
> exchanged.

An additional note:  if I turn OFF /proc/sys/net/ipv4/ip_forward and 
then start the proxy in bridging mode, the following happens when it is 

DBUG:handle_command: received command "8725_4 UAIEc0,101 
5f1690462d84b3814915b05f65c626bd at 11832 
INFO:handle_command: new session 
5f1690462d84b3814915b05f65c626bd at, tag as214288b6;1 
requested, type strong
Segmentation fault

In other words, it seems to require ip_forward to be on in order to not 
crash, but when it is on, no packets are exchanged between the interfaces.

Alex Balashov - Principal
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671

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