[Asterisk-Users] RE: Digium ISDN card

[Scott Stingel]

(thread moved from asterisk-dev)

Hello Wai-

You can find out a lot about the digium cards and asterisk software on 
the "Wiki", which is at:

http://www.voip-info.org/tiki-index.php?page=Asterisk

Briefly, though, asterisk implements things like DTMF and voice 
detection using the host processor's hardware/software.  This makes the 
cost of the interface card much lower than, say, a Dialogic, but limits 
to some extent the number of channels you can handle with one processor.

With the size of the processor you mentioned, for most applications you 
could probably handle between 3 and 4 full E1 spans, but heavy 
transcoding might cut that number down somewhat.  Test before you commit!

Hope this gets you started.

Regards
Scott Stingel

www.evtmedia.com




Wai Wu wrote:

> Hi all,
>
> My first post here. We will be implementing an * solution with Digium 
> Pri cards. I have a few questions. First, what is the largest * system 
> anyone has put together with a P4 3.4GHz with a 1GByte of ram? My 
> second question is regarding to the Digium Pri card. On the Digium 
> site, I notics those cards are half length cards and they are quite 
> small. As dtmf detection, and active voice detection is concerned, are 
> they done on the card itself or they are done in *?
>
> Regards
>
>  
>
>  
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