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List:       serusers
Subject:    Re: [SR-Users] Need help understanding/separating signaling from	media
From:       Grant Bagdasarian <GB () cm ! nl>
Date:       2013-01-28 19:06:33
Message-ID: FB7D97A214987F458242ACBDF876140738BF2EAD10 () clubvirtual40 ! ClubMessage ! local
[Download RAW message or body]

Alright, thanks! I'll just use virtuals for our sip proxies and physical se=
rvers for media, like I intended to do.
________________________________________
Van: sr-users-bounces@lists.sip-router.org [sr-users-bounces@lists.sip-rout=
er.org] namens Alex Balashov [abalashov@evaristesys.com]
Verzonden: maandag 28 januari 2013 18:18
Aan: SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) -     Use=
rs   Mailing List
Onderwerp: Re: [SR-Users] Need help understanding/separating signaling from=
     media

It is indeed not generally recommended, due to the extremely real-time, del=
ay-sensitive nature of media and the way VMs can subject a user space proce=
ss like rtpproxy to distorted I/O scheduling and timing.

However, this seems to be less of a problem as virtualisation evolves close=
r and closer "to the metal", and in any case is unlikely to be an issue for=
 relatively small numbers of concurrent calls, on a non-oversubscribed hype=
rvisor.

Still, it is not recommended from a "best practical" point of view, definit=
ely not.

Grant Bagdasarian <GB@cm.nl> wrote:

>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=92t 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/
>
>_______________________________________________
>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>sr-users@lists.sip-router.org
>http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>_______________________________________________
>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>sr-users@lists.sip-router.org
>http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

--
Sent from my mobile, and thus lacking in the refinement one might expect fr=
om a fully-fledged keyboard.

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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