> I am trying to get some feedback from anyone who may have experience of
> a problem I am having.
> We have several buildings that having only fiber to them so in order
> that the alarm panel can call the central station, I have provided a
> Sipura 1001 ATA. I can make a call to the central station through the
> ATA, using an analogue phone.
> The alarm panel does not seem to function properly thorugh the ATA,
> either it is not going off-hook properly or the ATA is treating the
> modem tones as a fax, I am not sure what is happening. Does anyone have
> experience of getting this to work?
Is the alarm panel truly expecting to use a modem to communicate with
central station?
If so, sip/rtp will not handle modems that attempt to use anything
greater then about 2400 baud. (Note: there is a diffence is the term
"baud" verses "bits/second". Newer high-speed modems use an
encoding
mechansim that involves phase-shift technology to achive a higher
bit-per-second speed over a low baud rate. sip/rtp will not accurately
reproduce any modem signal that involves phase-shifting. The sampling
rate is not sufficient to accurately reproduce phase-shifted analog
signals.)
Also, in the sipura release notes (for v3.1.5) specifically
indicates they watch for fax tones and, more recently, modem tones.
. Distinguish between FAX Passthrough mode and Modem Passthrough Mode.
Modem Passthrough Mode can only be triggered by predialing the
<Modem Line Toggle Code>. FAX Passthrough Mode is triggered by
CED/CNG tone or NSE events. Echo canceller is automatically disabled
for Modem Passthrough Mode only. Echo canceller is automatically disabled
only if <FAX Disable ECAN> (Line 1/2) is set to "yes" for
that line
(in that case FAX passthrough is the same as Modem passthrough).
Call-waiting and silence suppression is automatically disabled for
both FAX and Modem passthrough as before. In addition, out-of-band
DTMF Tx is disabled during modem or fax passthrough (all audio are
The "Modem Line Toggle Code:" option appears on the Regional tab and
has a default string of "*99". Therefore, your alarm panel modem would
need to prefix its dialing with *99.
Might check those two items.
Rich