Thanks, everyone, for your suggestions. I'm going to stop by the office
tomorrow to try some of these out.
Here's more info on the setup: We bought a brand new computer for this
-- I don't have the specifics right now, but will look that up in the
office tomorrow. We have two Digium cards -- a TDM04B and a TDM01B.
This system supports two organizations sharing the same office space: 3
lines go to one org., the other 2 go to the other.
The Digium cards actually are sharing IRQs with other devices -- the
installer mentioned it could be an issue initially, but when he saw that
the devices that the cards were sharing with were the network card and
the video card, he said to just try and see if it works first. Sounds
like some of the problems that we're having could be related to this,
and it's probably the first thing I should try changing.
I have tried using ztmonitor to adjust the txgain and rxgain. It was
very frustrating ... changing the tx to higher or lower values did not
necessarily change it in the direction you'd think. Also, changing rx
sometimes affected tx and vice versa. In the end, I gave up because
nothing I did increased sound quality -- although it wasn't so hard to
make things worse. Any hints here?
We're using Sipura phones. We realize these aren't has high quality as
Polycoms, but this was what the manger decided to get based on the
budget. We're spending more than originally anticipated now because of
the problems we're having, but it seems like the Digium cards are a more
likley culprit than the Sipura phones. However, if there's a way to
isolate problems, that'd be great. I guess one thing is we could try
more experiments with one extension calling another -- if the sound
quality is a lot better, then it's unlikely a problem with the Sipura
phones. If the sound quality is poor, I'll try hooking up the phones to
a new network card.
As for interference ... we don't have wireless devices, and the main
phone we're testing with is about 10' away from the switch. I suppose
there's still some possibility with interference, but I think it's
something I'll prioritize a little lower.
One additional question -- are VoIP lines generally easier to get going
w/ good sound quality than POTS lines? One reason we went with POTS was
for sound quality. Of course, we also figured it'd be more reliable than
DSL, which was the main reason for going with POTS lines. Right now we
use 5 POTS lines ... if VoIP sounds better, we were thinking of dropping
three of those lines and getting VoIP lines, keeping the POTS lines as
backup. Any thoughts on that plan? One thing I'm not sure about is how
to select the POTS lines from the phone sets. I suppose we could assign
a second extension to the phones (they support 2) and have the second
one be POTS and the first be VoIP. Another thing I was wondering is
whether we could get hunting to work properly with a mix of VoIP and
POTS. I'll call the phone company tomorrow, but if anyone has tried
anything like this, I'd like to hear about it.
Also, are there any VoIP vendors that work particularly well with
Asterisk? I've seen Broadvoice mentioned a bit ... are they a good
company for this? I'd love a company that could do automatic failover
-- if the VoIP line cuts out, transfer to an analog phone line (I know
Vonage has a feature like this, but they're expensive and we don't need
a lot of the features).
Thanks again for all the suggestions!
Jen
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