[Asterisk-Users] Is it possible to push the media processing off to a gateway for processing?

[T. Chan]

I think what Todd was referring to was to JUST do the signaling proxy on the
Asterisk but not proxying the media. The Asterisk box would ONLY do the
signaling handling between the two endpoints and hang over the media stream
to go directly between the two endpoints. This is a question I was wondering
as well. I was thinking of doing the same thing if possible with H323, I
read from somewhere that this is doable with SIP setting canreinvite to YES
(or was it NO??) and thereby leaving the media stream to go directly between
the endpoints and not proxying the media stream.

Please if someone can help, that would be appreciated, thanks for all !

Tom

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of John Todd
Sent: Saturday, January 24, 2004 10:53 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] Is it possible to push the media
processing off to a gateway for processing?


If you are considering such a service, you need to develop a more
thorough understanding of VoIP protocols and methods for load
distribution.  To echo what Stephen Critchfield said to someone else
just a few hours ago: it's not simple, and you'll probably need a
consultant.  After you've spent some time designing and discussing,
you'll probably be able to do it yourself next time but to try this
from scratch is probably a very long trial-and-error effort.

The short answer to your question for your research is: use load
sharing and SIP redirects to spread load across multiple boxes, and
yes, asterisk configs can be pulled from mysql in various ways - dig
through the distribution for details.

JT


>Well, I like the features asterisk gives me such as voicemail and IVR,
>Prompts, etc.  I would like to offer an IP Centrex like service, but don't
>believe that I can handle very large amounts of users on a box.  The reason
>I believe this is that the box would be doing all the media processing/DSP
>work on the processor and would be bound by the speed and memory of the box
>as to how many simultaneous sessions it could manage.  A gateway has DSP's
>which are designed to handle this processing.  I know they are more
>expensive, but I could handle large amounts of call volume this way and
>still keep the features asterisk offers.
>
>Another question I also meant to ask was having the ability to read
>extensions from a database instead of a .conf file.  I was curious if
anyone
>has asterisk pulling configs from a database like mysql.
>
>Todd
>
>
>-----Original Message-----
>From: asterisk-users-admin at lists.digium.com
>[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of John Todd
>Sent: Friday, January 23, 2004 9:05 PM
>To: asterisk-users at lists.digium.com
>Subject: Re: [Asterisk-Users] Is it possible to push the media processing
>off to a gateway for processing?
>
>>I was wondering if it is possible to have Asterisk push the media
>processing
>>off to something with DSP's such as a gateway?  That way, asterisk just
has
>>to handle the call setups and tear downs.
>>
>>Todd Wallace
>
>You mean, like what SIP does by default?  This is an incomplete
>question.  Please be more specific.  If I have a "gateway", and I
>have SIP calls coming in from desktop SIP UA's (hardphones or
>softphones) then Asterisk can simply re-direct those calls to the
>gateway.
>
>Of course, Asterisk _is_ a gateway, so unless you have specific
>reasons for doing so, it would make more sense to use Asterisk to
>tackle those jobs with generic, cheap processing horsepower rather
>than expensive, proprietary DSP's.
>
>If you're just getting Asterisk to handle call setups and teardowns,
>why not just use a real SIP proxy for that?  Or do you not know
>enough about your question to understand why I would differentiate
>between the two?  (not being nasty here, just wondering if I need to
>explain more)
>
>JT
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