Re: [hylafax-users] not receiving faxes (pbx problem?)

[shouldbe q931]

On Fri, Mar 18, 2011 at 5:10 PM, Giuseppe Zichittella <salvai...@yahoo.it
> wrote:

> What is that? Is it a fax modem? Is it an adaptor for the pbx to work with
> fax modem?
>
> Thx.
>
>
>>
>> I'll guess that although its an analogue socket, its not generating enough
>> ring current, try something like this
>> http://www.handsetwarehouse.co.uk/product.php/337/111/mod-tap-full-master-socket-adapter/b223b06b9b249798e8760662405064b1
>>
>>
>
No, it is NOT a modem, it is a PBX master adaptor

What troubleshooting steps have you done on the office line ?

Please reply to the list, and not to me

[Giuseppe Zichittella]

I quote myself showing you the main problem:

*When I try to receive a call using the modem in my apartment with a normal
telephone line I can receive RING detection signals from the modem and
faxgetty answers. But if I run the test in my office (where I'm supposed to
install the hylafax server) the modem doesn't not hear any ring! The tests
have been made exactly with the same pc, same modem and same telephone
cable. I even made tests under windows, just to be sure is not a driver
problem, and the results are just the same.

The main (and the only) difference I know between my apartment and my
company telephone line is that in our company we are behind a switchboard (a
kind of PBX). For such reason for calling I use a prefix "ModemDialCmd:
ATDT0,%s"...but I have no idea why the modem does not listen incoming
calls...**does different ring types exist? How can I workaround?*

Now...should the PBX adaptor fix this problem?

Thanks.

G.Z.

2011/3/22 shouldbe q931 <should...@gmail.com>

[Giuseppe Zichittella]

Unfortunately the line is already set to analog.
This is proven by the fact that USR 5633 fax modems on the actual windows
2003 server correctly answer the calls...

For this reason I think USR 5633 fax modem have more capabilities than the
Rockwell/Conexant modem I'm currently testing.
Do you guys have any idea on what make US Robotics fax modem able to hear
the rings even behind a PBX?

2011/3/22 Henry L Mijares M <hmijare...@hotmail.com>

> Maybe the line you are using in your office is a digital one, I think you
> need and analog to use hylafax or any fax..!
> Enviado desde mi BlackBerry de Movistar

>
> -----Original Message-----
> From: Giuseppe Zichittella <salvai...@yahoo.it>
> Date: Tue, 22 Mar 2011 09:19:06
> To: <hylafa...@hylafax.org>
> Subject: Re: [hylafax-users] not receiving faxes (pbx problem?)
>
> I quote myself showing you the main problem:
>

> When I try to receive a call using the modem in my apartment with a normal
> telephone line I can receive RING detection signals from the modem and
> faxgetty answers. But if I run the test in my office (where I'm supposed to
> install the hylafax server) the modem doesn't not hear any ring! The tests
> have been made exactly with the same pc, same modem and same telephone
> cable. I even made tests under windows, just to be sure is not a driver
> problem, and the results are just the same.
>
> The main (and the only) difference I know between my apartment and my
> company telephone line is that in our company we are behind a switchboard (a
> kind of PBX). For such reason for calling I use a prefix "ModemDialCmd:
> ATDT0,%s"...but I have no idea why the modem does not listen incoming

> calls...does different ring types exist? How can I workaround?

>
> Now...should the PBX adaptor fix this problem?
>
> Thanks.
>
> G.Z.
>
>

> 2011/3/22 shouldbe q931 <should...@gmail.com <mailto:

[Stefan Wagner]

It seems as if the modem doesn't detect the ring condition on the phone
line.

Ringing is signalled by an AC voltage repeatedly applied to the line. In
public networks this is usually a voltage between 60 and 120 V AC and 25 Hz
(old systems, ring voltage from a separate rotating generator) or 50/60 Hz
(derived from AC mains).

Some PABX however provide much lower voltages, sometimes as low as 48 V AC
or even lower. Not all modems do detect these low ring voltages!

If you want to check, you could use an AC voltage meter coupled by a medium
size capacitor (e.g. 1 µF) and appropriate voltage ratings. (Without the
capaitor you would measure the DC line feed voltage as well.) Of course you
could also use an oscilloscope.

You should be able to see each ring as an AC burst of approx. 1 seconds
length.

So if there are ring voltage bursts and the modem does not react, the ring
voltage is very likely too low for your modem.

Good Luck!

Kind regards

Stefan

[Bodo Meissner]

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Am 22.03.2011 10:19, schrieb Giuseppe Zichittella:

> But if I run the test in my office (where I'm supposed to
> install the hylafax server) the modem doesn't not hear any ring!

How does a phone ring on this line?

> I use a prefix "ModemDialCmd:
> ATDT0,%s"...

This only means you have to dial 0 and wait a bit to get an external line. It is not related to incoming calls.

> but I have no idea why the modem does not listen incoming
> calls...**does different ring types exist? How can I workaround?*

Yes. There are PBX that use different ring patterns for internal and external calls, for example one long ring for internal calls and two short rings for external calls. Modems or fax devices may not detect the a ring with the short ring pattern.
Depending on the type of PBX there might be configuration options to avoid this problem. Maybe you can configure the analog line as a fax line to tell the PBX to always use long ring signals. Or it may be possible to choose which ring pattern should be used for different types of calls. (external, internal or door calls).

Bodo
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[Robert Branham]

If you don't own a buttset to test the line borrow one from a friend or
pick up a cheap analog phone to plug into that jack. Verify you are
getting real dial tone and this jack isnt really a digital port from
the pbx, also verify the ring pattern using one of these devices to take
out any electronic interveining that the pbx phone may unintentionally
do.

Thank You
Robert Branham
President
Branham IT Solutions LLC
314-565-7582
Website www.bits-stl.com
Linkedin www.linkedin.com/in/bobbranham
Yelp www.yelp.com/biz/branham-it-solutions-llc-high-ridge

-----Original Message-----
From: Bodo Meissner [mailto:bo...@bodo-m.de]
Sent: Tuesday, March 22, 2011 4:31 PM
To: hylafa...@hylafax.org
Subject: Re: [hylafax-users] not receiving faxes (pbx problem?)

[shouldbe q931]

If on the office line the USR modem detects ring tone, and the modem you are
using does not (but works on your home phone line), then it would indicate
that the USR modem has "better" ring tone detection.

Not all analog lines are the same, there are differences in ring voltage,
ring current and ring cadence as well as line impedance.

The PBX "master adaptor" has a "ring capacitor" in it, as why this might be
needed on your PBX please take it up with your telephone system
manager/maintainer

[Amin Mozafari]

Sounds like an impedance mismatch problem. Try changing country settings of
your modem or, if possible, of your PBX to match the correct telecom
standards.

[Giuseppe Zichittella]

ShouldBe931 you perfectly understood the situation. That's why I was asking
for linux compatible fax modem that have multi ring detection capabilities
(as USR).
*Do you guys know any model?*

In case I would not find a capable fax modem I could buy the master adapter
that should normalize my line signal and let it work as a normal analog
line.
*Is it right?*
*
*
I saw the master adapter has one RJ45 interface...this confuses me a
bit...where should I attach it? And where is the the RJ11 interface?

Sorry for stressing you guys too much..and...many thanks.

G.Z.

2011/3/23 shouldbe q931 <should...@gmail.com>

[shouldbe q931]

take it up with your telephone system manager/maintainer