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

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@lists.sip-router.org [sr-users-bounces@lists.sip-router.org] namens Alex Balashov [abalashov@evaristesys.com] Verzonden: maandag 28 januari 2013 17:11 Aan: sr-users@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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