Re: [Alsa-user] A long shot I know: recording from a POTS phone for voicemail

2016-02-23 Thread Robert M. Riches Jr. 
> Date: Tue, 23 Feb 2016 19:06:44 -0500
> From: doug 
> To: p...@pricom.com.au, alsa-user@lists.sourceforge.net
>
>
> On 02/23/2016 03:10 PM, Philip Rhoades wrote:
> > People,
> >
> > I know this is a bit of a long shot but does anyone here have any
> > experience setting up a voicemail recording system for a POTS phone?  I
> > thought it should be simpler than using say using Asterisk to set up a
> > whole PABX but maybe it isn't . .
> >
> > Yhanks,
> >
> > Phil.
> It depends on what you are trying to do. If you just want to record the 
> audio on a telephone line, the easiest way is
> a small audio transformer and a capacitor. Say a 1 Ohm 1:1 audio 
> transformer and about a 0.1 microfarad capacitor
> rated at 100 volts DC or better in series with the transformer on the 
> phone line side. Connect the secondary to the recorder
> or computer line input.
>
> If you're trying to run voice in both directions from, say, a computer 
> to the phone line, you need a telephone modem, which
> is explicitly designed to do that job.

If you use the transformer and capacitor solution, you'll also
need something to provide a DC path across the phone line or the
phone company switch will hang up the call.  Here's a schematic I
posted to another forum:

https://tech.lds.org/forum/download/file.php?id=2636

If maximum economy is required, especially for a one-time event,
you can use a 1K resister instead of the choke and drop the MOV,
Zener diodes, and R1.

HTH

Robert

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Re: [Alsa-user] A long shot I know: recording from a POTS phone for voicemail

2016-02-23 Thread Philip Rhoades 
Guys,


On 2016-02-24 11:28, chris hermansen wrote:
> Doug, Philip, list;
> 
> On Tue, Feb 23, 2016 at 4:06 PM, doug 
> wrote:
> 
>> On 02/23/2016 03:10 PM, Philip Rhoades wrote:
>>> People,
>>> 
>>> I know this is a bit of a long shot but does anyone here have any
>>> experience setting up a voicemail recording system for a POTS
>> phone?  I
>>> thought it should be simpler than using say using Asterisk to set
>> up a
>>> whole PABX but maybe it isn't . .
>>> 
>>> Yhanks,
>>> 
>>> Phil.
>> It depends on what you are trying to do. If you just want to record
>> the
>> audio on a telephone line, the easiest way is
>> a small audio transformer and a capacitor. Say a 1 Ohm 1:1 audio
>> transformer and about a 0.1 microfarad capacitor
>> rated at 100 volts DC or better in series with the transformer on
>> the
>> phone line side. Connect the secondary to the recorder
>> or computer line input.
>> 
>> If you're trying to run voice in both directions from, say, a
>> computer
>> to the phone line, you need a telephone modem, which
>> is explicitly designed to do that job.


The main reason is to simply replace my answering machine with my 
computer - I don't need to make calls out or record my conversations or 
anything like that - the setup justs needs to answer the phone when I am 
not around and record a message as a WAV file or something . .


> Most older laptops include a modem.  Or if you don't have one of those
> you can buy a cheapo modem
> 
> Here is a reference you might find useful
> http://www.linuxtoys.org/answer/answering_machine.html
> 
> Here is another http://frank.harvard.edu/~coldwell/answering_machine/
> 
> Another
> http://askubuntu.com/questions/513004/telephone-call-answering-machine-software
> 
> Another
> http://unix.stackexchange.com/questions/44624/is-there-a-way-for-linux-to-pick-up-the-phone
> 
> You may also be able to do the job with vgetty
> http://linux.die.net/man/8/vgetty


I will have a look at all that - thanks!

Regards,

Phil.
-- 
Philip Rhoades

PO Box 896
Cowra  NSW  2794
Australia
E-mail:  p...@pricom.com.au

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Re: [Alsa-user] A long shot I know: recording from a POTS phone for voicemail

2016-02-23 Thread chris hermansen 
Doug, Philip, list;

On Tue, Feb 23, 2016 at 4:06 PM, doug  wrote:

>
> On 02/23/2016 03:10 PM, Philip Rhoades wrote:
> > People,
> >
> > I know this is a bit of a long shot but does anyone here have any
> > experience setting up a voicemail recording system for a POTS phone?  I
> > thought it should be simpler than using say using Asterisk to set up a
> > whole PABX but maybe it isn't . .
> >
> > Yhanks,
> >
> > Phil.
> It depends on what you are trying to do. If you just want to record the
> audio on a telephone line, the easiest way is
> a small audio transformer and a capacitor. Say a 1 Ohm 1:1 audio
> transformer and about a 0.1 microfarad capacitor
> rated at 100 volts DC or better in series with the transformer on the
> phone line side. Connect the secondary to the recorder
> or computer line input.
>
> If you're trying to run voice in both directions from, say, a computer
> to the phone line, you need a telephone modem, which
> is explicitly designed to do that job.
>
>
Most older laptops include a modem.  Or if you don't have one of those you
can buy a cheapo modem

Here is a reference you might find useful
http://www.linuxtoys.org/answer/answering_machine.html

Here is another http://frank.harvard.edu/~coldwell/answering_machine/

Another
http://askubuntu.com/questions/513004/telephone-call-answering-machine-software

Another
http://unix.stackexchange.com/questions/44624/is-there-a-way-for-linux-to-pick-up-the-phone

You may also be able to do the job with vgetty
http://linux.die.net/man/8/vgetty


-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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Re: [Alsa-user] A long shot I know: recording from a POTS phone for voicemail

2016-02-23 Thread doug 

On 02/23/2016 03:10 PM, Philip Rhoades wrote:
> People,
>
> I know this is a bit of a long shot but does anyone here have any
> experience setting up a voicemail recording system for a POTS phone?  I
> thought it should be simpler than using say using Asterisk to set up a
> whole PABX but maybe it isn't . .
>
> Yhanks,
>
> Phil.
It depends on what you are trying to do. If you just want to record the 
audio on a telephone line, the easiest way is
a small audio transformer and a capacitor. Say a 1 Ohm 1:1 audio 
transformer and about a 0.1 microfarad capacitor
rated at 100 volts DC or better in series with the transformer on the 
phone line side. Connect the secondary to the recorder
or computer line input.

If you're trying to run voice in both directions from, say, a computer 
to the phone line, you need a telephone modem, which
is explicitly designed to do that job.



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[Alsa-user] A long shot I know: recording from a POTS phone for voicemail

2016-02-23 Thread Philip Rhoades 
People,

I know this is a bit of a long shot but does anyone here have any 
experience setting up a voicemail recording system for a POTS phone?  I 
thought it should be simpler than using say using Asterisk to set up a 
whole PABX but maybe it isn't . .

Yhanks,

Phil.
-- 
Philip Rhoades

PO Box 896
Cowra  NSW  2794
Australia
E-mail:  p...@pricom.com.au

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