[Asterisk-bsd] Does

[William Lloyd]

The analog FXO cards are a nightmare, I would advise staying away  
from them.  If you need a couple FXO/FXS ports buy a sipura 3000.

Depending upon your voice quality requirements, hardware echo  
canceling is the deciding factor.  While the software echo cancelers  
in Asterisk are good, hardware echo canceling is better.

Are you doing TDM traffic switching or a lot of SIP/IAX traffic?

I've had very good results with FXS channel banks on T1 cards.  Don;t  
be scared to try it.

Personally I think hardware echo canceling is still a must have if  
you are doing SIP/IAX.  That means you either go with channel banks  
and the latest hardware echo canceling T1/PRI Digium/Sangoma cards or  
you get an external box like Audiocodes with hardware echo canceling  
built in.

The first digium card was ok after I disabled most of the stuff in  
the bios.  Adding a second card required digium to remotely log into  
the machine to help get it working properly.  On the plus side the  
free Digium tech support for hardware was excellent.

-bill



On 8-Dec-05, at 5:51 PM, Jeff LaCoursiere wrote:

>
> On Thu, 8 Dec 2005, William Lloyd wrote:
>
>>
>> I'm running 8 T1/PRI almost fully loaded with sangoma with no
>> hiccups.  The interrupt issues with digium cards and the 3.3 5v thing
>> are downsides to the digium stuff.
>>
>
> Does "interrupt issues" apply to single Digium cards or when you try
> multiple cards?  I am comparing Digium T1 + channel bank against an
> Audiocode 24 x FXO SIP gateway.  I need six T1s, so should I worry  
> about
> trying to install two 4 port Digium T1 cards?  The Audiocode stuff  
> is a
> bit more expensive by the port, but all this talk about Digium  
> hardware
> being unstable makes me wonder if I should pay it anyway...
>
> j
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