[OpenSIPS-Users] OpenSIPS-mediaproxy, Asterisk (packet2packet bridge) - problem with RTP

[Dimitrios Giannakopoulos]

Hi Ruud,

Thanks for your help. I found the problem and now it is working.

regards,
Dimitris

On Thu, Jul 2, 2009 at 7:40 PM, Ruud Klaver<ruud at ag-projects.com> wrote:
> Hi Dimitrios,
> On 02 Jul 2009, at 13:17, Dimitrios Giannakopoulos wrote:
>
>> Hi,
>>
>> So, according to our scenario the asterisk has private ip. Any traffic
>> from/to the asterisk can be routed to/from our network.
>> The Network trace (between asterisk and opensips) shows that
>> mediaproxy does not forward rtp packets to asterisk.
>> I tried the rtpproxy component instead of mediaproxy  and the scenario
>> (B) worked.
>>
>>
>> On Thu, Jul 2, 2009 at 11:26 AM, Ruud Klaver<ruud at ag-projects.com> wrote:
>>>
>>> Hi,
>>>
>>> On 02 Jul 2009, at 08:58, Dimitrios Giannakopoulos wrote:
>>>
>>>> Hi all,
>>>> Thanks for the help.
>>>>
>>>> I have set nat=no  but problem persists.
>>>
>>> So is your Asterisk on a public IP? Could you at least confirm with a
>>> network trace that mediaproxy is forwarding RTP packets from the gatways
>>> (from both sessions) to Asterisk, but that it is not sending RTP back?
>>>
>>> Ruud Klaver
>>> AG Projects
>>>
>
> If your asterisk puts a private IP for itself in the SDP, mediaproxy can
> never know where to forward the RTP it receives from the gateway to, so it
> waits for RTP to come in from Asterisk so it can learn its IP. Apparently
> Asterisk is also waiting for RTP to come in from the relay, so basically you
> have a standoff situation. You're making Asterisk function as a relay as
> well, and if you put two relays in a path they will have this standoff
> situation unless one of them starts forwarding the packets already to the IP
> that was in the SDP. Obviously Asterisk does not do this and mediaproxy
> can't do it because the IP in the SDP is private.
>
> Ruud Klaver
> AG Projects
>