[asterisk-users] Using asterisk with DSP chips

[Eric Wieling]

If you want to use your own DSP transcoder, try asking on asterisk-dev.  If you simply want to use a hardware based transcoder Digium and Sangoma have cards.

Sangoma: http://sangoma.com/products/hardware_products/transcoding.html
Digium: http://www.digium.com/en/products/hardware/voice

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of David Backeberg
Sent: Sunday, November 20, 2011 11:18 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Using asterisk with DSP chips

On Fri, Nov 18, 2011 at 2:23 PM, Sazzad <sazzadbinkamal at gmail.com> wrote:
> Hi,
> I have to use asterisk with some dedicated DSP chips, which will do 
> the expensive G729 CODEC computing, so that the server processor has 
> minimum load. I was informed, I've to use GPAK to implement this. So 
> far I've

I had never heard of GPAK before your post, so I had to look it up. I still do not really understand it.

There are at least a few ways to combine asterisk and G.729. And honestly, I would say your problem is not so much the cpu load, but the licensing, because G.729 is under patent. You can buy G.729 licenses from Digium, and do G.729 natively in asterisk.

http://store.digium.com/productview.php?category_id=5&product_code=8G729CODEC

> Whether embedded scenario is a must for such development or is it 
> possible to use asterisk on server and dsp's through some PCI/Ethernet?

It is also possible to have asterisk speak open codecs, like G.711, and have another ethernet-connected device to the codec, and pay a different vendor for that licensing.

For example, you can use a Cisco 3945, load it up with DSPs, and setup the router config to do the transcoding between G.711 and G.729. I've done this before, and it works, but you have to shell out $10k + for the router and smartnet and all the DSPS if you are doing as many simultaneous channels as I'm using.

But I'm still not sure this is your actual question. I realize English is probably not your first language, however, if you contracted for a job and you HAVE to use GPAC because somebody else told you that is the job requirement, I have no idea how to do that.

--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs:
               http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users