Anyway, refering to http://en.wikipedia.org/wiki/Integrated_Services_Digital_Network / Basic
rate Interface paragraph, my setup includes :
- a single network termination unit, installed and managed by telco, is connected to public
network through 2 twisted pairs,
- this unit includes two small electronic cards,
- each card has two RJ45 sockets,
- each card is connected through a single Cat5 straight, 1m long patch cord to a single BRI
port from my Patton box,
- both Patton's BRI ports are managed as a "hunt group" (for outbound calls),
- for inbound, I didn't checked but usually, Telco sends one call on one interface, the next
one and the next interface.
So to summarize, (I think):
- I'm getting ISDN signal from two distinct copper pairs,
- it is not an S0-bus.
"Termination Unit" probably means you get the T reference point and behind the unit you do have
the S reference point with a 4 wire signal, which would be a standard setup.
Are you sure that your are not dealing with termination issues?
Try sending a T.30 fax with fine resolution and ecm enabled when your
connection is up. If
it takes too long or fails, this is something to look at.
Can you elaborate a bit ?
Maybe it is easier if you could mention your country and your telco. I would guess you are
either in France or Belgium, but I could be wrong. Then we could simply lookup what is relevant
for you.
I'm using an old Asterisk 1.6.1 version there so I can't rely on T.38/T.30 gateway feature at
the moment.
I said T.30 and not T.38 and the complete explanation would be rather technical. In essence a
T.30 fax with ecm enabled does not react nicely to certain signaling errors and pertubations and
this is easy to detect. Most of the time I can guess what the problem is when I see the type of
error. Don't ask me how I learned this. Once you know what to look for, Asterisk 1.whatever is
very reliable as far as facsimiles go.
jg
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