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Sci.Electronics.Basics -> telephone monitoring circuitry
There are 4 messages in this thread.
You are currently looking at messages 1 to 4.
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Author: Will BarbourDate: 12:58 08-04-07
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Hi
This seems to be an active newsgroup and so I was wondering if there is
someone who could help me with a techie problem...
I am developing hardware/software to monitor the performance of a small
call centre (~5 phones).
On a daily basis I need to retrieve statistics such as the amount of
time the phones are in use, are on hold, how many calls are received, etc.
To this aim, i will need to periodically poll the status of each of the
phones (from a PC). Status being either:
* Not in use
* Ringing
* On hold
* In conversation
So I was thinking that I could have a device which would sit in between
the phones and the junction box,and make the status(es) available to a
PC via a serial port.
The device would act as a finite state machine,moving from state to
state when a RING, DIALTONE or SPEECH (or lack of) is detected. The
status could be made available via the use of a couple of pins on a
serial port.
As I am not overly experienced either with electronics, or telephone
protocols, I was wondering if anybody knows of how this device could be
built. Or any fresh ideas as to how I could achieve the same aim??
Many thanks
Will
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Author: jasenDate: 21:15 08-04-07
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On 2007-04-08, Will Barbour <s0451664@sms.ed.ac.uk> wrote:
> Hi
> So I was thinking that I could have a device which would sit in between
> the phones and the junction box,and make the status(es) available to a
> PC via a serial port.
why not get that data from your PABX
Bye.
Jasen
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Author: Will BarbourDate: 05:38 09-04-07
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jasen wrote:
> On 2007-04-08, Will Barbour <s0451664@sms.ed.ac.uk> wrote:
>> Hi
>
>> So I was thinking that I could have a device which would sit in between
>> the phones and the junction box,and make the status(es) available to a
>> PC via a serial port.
>
> why not get that data from your PABX
>
> Bye.
> Jasen
I do not have access to this.
cheers
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Author: Ross HerbertDate: 22:48 09-04-07
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On Sun, 08 Apr 2007 17:58:44 +0100, Will Barbour
<s0451664@sms.ed.ac.uk> wrote:
>Hi
>
>This seems to be an active newsgroup and so I was wondering if there
is
>someone who could help me with a techie problem...
>
>I am developing hardware/software to monitor the performance of a
small
>call centre (~5 phones).
>
>On a daily basis I need to retrieve statistics such as the amount of
>time the phones are in use, are on hold, how many calls are received,
etc.
>
>To this aim, i will need to periodically poll the status of each of
the
>phones (from a PC). Status being either:
>
>* Not in use
>* Ringing
>* On hold
>* In conversation
>
>So I was thinking that I could have a device which would sit in
between
>the phones and the junction box,and make the status(es) available to
a
>PC via a serial port.
>
>The device would act as a finite state machine,moving from state to
>state when a RING, DIALTONE or SPEECH (or lack of) is detected. The
>status could be made available via the use of a couple of pins on a
>serial port.
>
>As I am not overly experienced either with electronics, or telephone
>protocols, I was wondering if anybody knows of how this device could
be
>built. Or any fresh ideas as to how I could achieve the same aim??
>
>Many thanks
>
>Will
Solving the problems will require schematic details of the system you
want to monitor. Small 5 line switching systems don't necessarily
conform to the same standards as a CO or PSTN exchange.
Most monitoring systems used to gather this type of data don't sit in
between the system and the phone, they simply sit across the line as a
relatively high impedance device. Voltage levels will give data as to
the actual state of the line (on-hook, off-hook, ringing, line lockout
- eg, one party may have hung up but the other remains off-hook).
Speech is not usually monitored due to privacy concerns and there is
hardly much point to detecting whether somebody is actually speaking
or not. It is usual to "assume" that if a phone is off-hook and not
ringing, that two way conversation is taking place. Where a phone
remains off-hook for extended periods without having dialled there may
be a tone and/or voltage level change to indicate this condition.
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