[SR-Users] Need help understanding/separating signaling from media

[Grant Bagdasarian]

Hello Alex,

Thank you for the explanation. It's clear to me now. 
One more thing, I've read that it's not recommended to have media being handled by virtual servers, is this also the case when using rtpproxy? We are using VMWare for virtualization.

Regards,

Grant

________________________________________
Van: sr-users-bounces at lists.sip-router.org [sr-users-bounces at lists.sip-router.org] namens Alex Balashov [abalashov at evaristesys.com]
Verzonden: maandag 28 januari 2013 17:11
Aan: sr-users at lists.sip-router.org
Onderwerp: Re: [SR-Users] Need help understanding/separating signaling from media

Hi Grant,

On 01/28/2013 11:03 AM, Grant Bagdasarian wrote:

> I think that the RTP Proxy module does precisely this, but what I
> still don’t understand is how the rtp stream is passed between these
> two agents for each call.

The Kamailio 'rtpproxy' module goes out to the rtpproxy service[1] and
asks it to engage the call, saying: "Can you please allocate and provide
me with a pair of ports for each end of this call?"  The rtpproxy
process answers, and Kamailio then writes the IP and ports provided by
rtpproxy into the SDP of both the requests and replies involved in
setting up the call.

The result is that as far as both UAs are concerned, rtpproxy is their
endpoint, and they will send media to it.  Kamailio instructs rtpproxy
to bridge both streams.

When the call is torn down, Kamailio tells rtpproxy to disengage and
deallocate the bridge mapping for those streams.

-- Alex

[1] Which may be running on the same host, or may be running on another
host, in a distributed fashion.  Kamailio talks to rtpproxy through
rtpproxy's UDP control socket, and more than one rtpproxy may be used,
both for failover and round-robin load distribution.  This is readily
baked into the rtpproxy module.

--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/

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