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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