[asterisk-users] Ghost in the Channel-Banks

[Justin Phelps]

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I've been struggling with an ongoing problem the last month.

Here is the layout of the wiring:
T1 from ISP > DiTech Echo Cancel device > Voice Channel-Bank

(same) T1 from ISP > (same) DiTech Echo Cancel device > asterisk1 server
zap card > fax channel bank

(same) T1 from ISP > (same) DiTech Echo Cancel device > asterisk1 server
zap card > asterisk2 server

Now, let me explain the symptoms.

d-channel errors on the asterisk1 server on span1 (which is the line
coming from the echo cancel from the ISP). asterisk2 server isn't being
used as far as I can tell. I've got a red alarm on the port on asterisk1
that asterisk2 is plugged into.

faxes through the fax channel bank are working most of the time. There
seems to be problems with multipage faxes. Not isolated to a particular
port on the channel bank. As I understand it, echo cancel for faxes is a
bad thing, so I don't understand why the previous IT Admin here setup
the system as such.

Some voice phones on the voice channel banks were not recognizing tones
when dialing. That seems to have been resolved after power cycling the
channel bank a few times, and restarting asterisk2 (odd that there
doesn't seem to be anything active on asterisk2)

I've been working with the ISP on the d-channel stuff, and things seem
to get a little better as they reset equipment, but the d-channel errors
have not gone away.

I really need advice on these problems. From what I've said, where do
you think the problem lies? in the channel banks? in the echo canceller?
in the asterisk2 or asterisk1 server? With the ISP?
- --
Regards,

Justin Phelps
IT Director
Eye Center of North Florida
850.522.7952 - Office
850.522.9829 - Fax
850.832.0249 - Cell
www.eyecarenow.com
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