[OpenSIPS-Devel] media proxy with sangoma

Saúl Ibarra Corretgé saul at ag-projects.com
Thu Aug 26 15:58:59 CEST 2010


Hi Richard and Dominique,

On 08/26/2010 03:47 PM, Dominique Broeglin wrote:
> Hi Richard,
>
> I wasn't at ClueCon but I'm currently testing one of those boards. My previous question about the media-proxy dispatcher protocol was to try and implement a proof of concept of this. Who did you talk to from Sangoma ? I would gladly add a little bit more weight to your demand ;-)
>
> Best regards,
> Dominique
>
> Le 26 août 2010 à 15:40, Richard Revels a écrit :
>
>> Bogdan and Saul (or anyone else for that matter),
>>
>> Good morning.  I was wondering if either of you had been approached by Sangoma at the ClueCon Convention?  They have a transcoding board that seems fairly inexpensive per channel.  I mentioned I would be quite interested if they did some work to make it accessible in conjunction with the media dispatcher and I had the impression they were open to the idea.
>>
>> Saul, I'm now thinking my previous posting about the media dispatcher and re-invites might have been a problem with me not capturing all the streams rather than the media relay not forwarding correctly.  I expect to be testing with that again early next week.  Sorry to have left it hanging for this long.
>>

In the current MediaProxy version (MediaProxy 2) packets are not handled 
in userspace, a conntrack rule is inserted and the kernel itself is 
doing the relaying of packets.

While there might be way of sitting in the middle of the packets, I'm 
not curently aware of it but that looks like the way to start.

Now, assuming that the RTP transcoding can be done, I guess the SDP will 
also need to be mangled to 'fool' the other endpoint and making him 
believe he is using a different codec. Or, are you thinking about 
another scenario?


-- 
Saúl Ibarra Corretgé
AG Projects



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