OK I have been battling with echo problems with asterisk on ISDN for a
few weeks now, and still can't solve it (although I think I have tried
everything I can find.)
I will try a post everything I think is possibly relevant that I can
remember with the hope someone can point me in the right direction.
current spec I am using (Trixbox 1.0 was still in beta at the time an
didn't detect the TE110 card, and modules didn't load properly when I
tried manually either )
[EMAIL PROTECTED] 2.8
Wildcard TE110P ISDN PRI card (set to E1, I live in the UK)
Telewest Q931 ISDN connection (currently 8 lines 100 phone numbers)
dell SC1425 server (3.2 Ghz, 512MB, 80GB)
SIP phones aastra 9133i run 1.4.0 firmware.
This is on a live system with about 50 users. (I have a identical system
for DR so can easily test out of hours)
Most the time there is no echo,
If I phone my wife (on a normal telewest analog line) I get a slight
echo (fairly quiet) that she does not noticed. This happens on other
phone calls but the user can tolerate this (would prefer to solve it)
If a big customer (one with several thousand employees) phones me, I can
hear a very loud echo with an annoying delay (0.5-1.0 sec, ish), which
the users cannot tolerate. The customer does not get the echo, currently
the user phones back?
Any suggestion on How to solve the echo problems?
I have tried with echo cancellation at 800 and changing the RX and TX
gains to no effect. I have read that ISDN should not have echo problems
and that may I sould ask about the gains on the line provided by the
telco. Can anyone give me more information about this as if I phone
Telewest I want to pretend that my PBX supplier has told me to ask XXX.
As the first thing they ask me is to contact my my PBX supplier (I had a
slight problem getting the ISDN card to initially connect)
Thanks
John
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