[Kamailio-Users] Using Asterisk as media server

Juan Perez jperezsip2008 at yahoo.com
Tue Mar 17 05:00:20 CET 2009


in a nutshell we wil be implementing a prepaid platform wich includes among other things, customs IVRs, time limited calls, vmail etc.
Also is what we feel more comfortable with, which goes a long way :-)



----- Original Message ----
From: Alex Balashov <abalashov at evaristesys.com>
To: Juan Perez <jperezsip2008 at yahoo.com>
Cc: "users at lists.kamailio.org" <users at lists.kamailio.org>
Sent: Monday, March 16, 2009 11:50:56 PM
Subject: Re: [Kamailio-Users] Using Asterisk as media server

What are the reasons for Asterisk to be in the media path?

Why not direct calls to it specifically when some feature needs to be provided?

--
Sent from mobile device

On Mar 16, 2009, at 11:23 PM, Juan Perez <jperezsip2008 at yahoo.com> wrote:

> 
> Alex, I understand your point and appreciate your input highly, but let's say that asterisk is needed as the media server for other reasons. It may not scale as well as the other solutions but we need them to be there to provide other services. I just wanted to know whether there was any difference aside from the scalabilty issue.
> 
> We were under the impression that it was imperative to use either media-proxy or rtp-proxy but after examining in more detail how the 2 solutions work we find no reason not to use asterisk as the media proxy as well. Unless of course we are missing the big picture here and surely will find out once we set out to test it. But given the deep knowledge of a lot of people in this forum we deemed necessary to ask about the feasibility of this workaround.
> If somebody detects any flaw on this solution or if there is someting else critical or not that we are missing we would love to hear it .
> 
> thank you in advance and thank you Alex again,
> jp
> 
> 
> ----- Original Message ----
> From: Alex Balashov <abalashov at evaristesys.com>
> To: Juan Perez <jperezsip2008 at yahoo.com>
> Sent: Monday, March 16, 2009 6:51:34 PM
> Subject: Re: [Kamailio-Users] Using Asterisk as media server
> 
> 
> No, because the amount of throughput you get per media/RTP proxy is much
> higher than you would get through something whose entire core is structured
> to behave as a PBX, with all the attendant features and latent event loop
> characteristics.  A media relay does one thing and one thing only, and it
> does it well.  Asterisk does many things, among them media relay.
> 
> So, while you could use Asterisk in this capacity, I don't see the point.
> It'd be a waste of time.  Also, you don't really want to get Asterisk
> involved in the signaling layer (as a B2BUA) if you can help it.  It
> introduces unnecessary complexity and possible points of interop problems
> and failure.  With a media relay that is controlled by API hooks into
> Kamailio, you don't have that problem.
> 
> On Mon, 16 Mar 2009 15:22:27 -0700 (PDT), Juan Perez
> <jperezsip2008 at yahoo.com> wrote:
>> 
>> thanks alex, but actually there will be several asterisk servers, managed
>> by the LCR module, that should be OK right?
>> it should be the same as adding several media-proxies or rtp-proxies, am
> I
>> wrong?
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> ----- Original Message ----
>> From: Alex Balashov <abalashov at evaristesys.com>
>> To: Juan Perez <jperezsip2008 at yahoo.com>
>> Cc: users at lists.kamailio.org
>> Sent: Monday, March 16, 2009 3:41:46 PM
>> Subject: Re: [Kamailio-Users] Using Asterisk as media server
>> 
>> No, nothing needs to be modified.
>> 
>> However, in this scenario you are limited to Asterisk's performance
>> characteristics in terms of the number of concurrent calls that can be
>> handled.  Just about any media relay will be much more scalable and
>> lightweight.
>> 
>> Asterisk is a PBX and a nice feature server.  You don't build SIP service
>> delivery platforms out of Asterisk used as a general-purpose call router.
>> 
>> Juan Perez wrote:
>> 
>>> Hello
>>> 
>>> In this scenario, customers behind NAT register in kamailio, records are
>> stored in a db etc. Kamailio uses Asterisk boxes as gateways to send
> calls
>> to PSTN.
>>> Is it possible to use Asterisk as the media server instead of
>> media-proxy or rtp-proxy?
>>> In this case the SDP that Asterisk sends in the 180 message needs to me
>> modified?
>>> 
>>> thank you
>>> jp
>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> Kamailio (OpenSER) - Users mailing list
>>> Users at lists.kamailio.org
>>> http://lists.kamailio.org/cgi-bin/mailman/listinfo/users
>>> http://lists.openser-project.org/cgi-bin/mailman/listinfo/users
>> 
>> 
>> -- Alex Balashov
>> Evariste Systems
>> Web    : http://www.evaristesys.com/
>> Tel    : (+1) (678) 954-0670
>> Direct : (+1) (678) 954-0671
>> Mobile : (+1) (678) 237-1775
> --Alex Balashov
> Evariste Systems
> Web    : http://www.evaristesys.com/
> Tel    : (+1) (678) 954-0670
> Direct : (+1) (678) 954-0671
> Mobile : (+1) (678) 237-1775
> 
> 
> 
> 



      





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