mattf wrote:
Hello,
Ok, I've tried tinkering with the ring voltage (this is an editable variable
on the Sipure SPA-2000) and I still can't get it to work. I plug a generic
POTS line in and it works, I plug an analog port from our old Comdial PBX in
and it works.
with the sipura adapter I've tried changing the ring voltage in the range
(20V to 90V) and the frequency from 10Hz to 100Hz both in 5 step increments
and nothing seems to work.
90V, 25Hz would be the best starting point. That is the commonest form
of ring voltage you will find.
Do these analog -> SIP VOIP adapters truely supply the 24V that a POTS line
supplies?
A POTS line supplies 48V, not 24V. Its loop current is usually more like
35mA than 20mA. A number of PBX and CTI line cards supply only 24V (the
Dialogic station cards, for example) and a number of phones don't work
properly with them. If your adaptor really supplies 24V, that might be
the problem.
Anybody have any ideas why this fax machine won't work with any analog
adapter I've tried?
Note that unles you use A-law or u-law exclusively through the signal
path, no type of modem will work through a VoIP adaptor.
Thanks,
MATT---
Regards,
Steve
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