How do I wire up a PC modem to dial a POTS phone line?

How do I wire up a PC modem to dial a POTS phone line?

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Subject Author Date
How do I wire up a PC modem to dial a POTS phone line? Al Dykes 08-04-2006
Posted by Al Dykes on August 4, 2006, 8:48 am
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The computer is a laptop without the usual two RJ11 jacks on the
built-in modem. Just one.

I have a PC name database application that will dial numbers for me
(and keep call records as a result, which is the real win).

Can I wire tip and ring for the laptop and the phone in paralled?

FWIW, the application uses TAPI. For incomming calls I can configure
the laptop not to answer.

Thanks
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Posted by Steven Lichter on August 4, 2006, 8:51 am
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Al Dykes wrote:
> The computer is a laptop without the usual two RJ11 jacks on the
> built-in modem. Just one.
>
> I have a PC name database application that will dial numbers for me
> (and keep call records as a result, which is the real win).
>
> Can I wire tip and ring for the laptop and the phone in paralled?
>
> FWIW, the application uses TAPI. For incomming calls I can configure
> the laptop not to answer.
>
> Thanks
There is an adapter that has one male RJ11 plug and 2 or more female
RJ11 jacks, you can get them at Radio Shack and other places.

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Posted by GlowingBlueMist on August 4, 2006, 11:47 am
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Steven Lichter wrote:
> Al Dykes wrote:
>> The computer is a laptop without the usual two RJ11 jacks on the
>> built-in modem. Just one.
>>
>> I have a PC name database application that will dial numbers for me
>> (and keep call records as a result, which is the real win).
>>
>> Can I wire tip and ring for the laptop and the phone in paralled?
>>
>> FWIW, the application uses TAPI. For incomming calls I can configure
>> the laptop not to answer.
>>
>> Thanks
> There is an adapter that has one male RJ11 plug and 2 or more female
> RJ11 jacks, you can get them at Radio Shack and other places.

When looking for the telephone splitter jack mentioned in the above keep in
mind there are two basic types.

1. Splits the line but gives one of the split jacks priority over the other
jack.
These types have led(s) on them indicating which jack is in use.

2. Just a splitter, no led(s) and does nothing more than split the line
between the two jacks. This is the cheaper priced of the two types.

Your application will work with either type but I would use the cheaper one,
no led(s), since you are not trying to give the laptop or the actual
telephone priority control of the jacks. K-mart and other major department
stores usually sell the splitters as well.



Posted by Gary Breuckman on August 6, 2006, 12:16 am
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Al Dykes wrote:

> The computer is a laptop without the usual two RJ11 jacks on the
> built-in modem. Just one.
>
> I have a PC name database application that will dial numbers for me
> (and keep call records as a result, which is the real win).
>
> Can I wire tip and ring for the laptop and the phone in paralled?
>
> FWIW, the application uses TAPI. For incomming calls I can configure
> the laptop not to answer.
>
> Thanks


I think you'll find that MOST of the modems that have two RJ11 jacks on
the rear have them just connected in parallel.

The days of expensive modems where the phone jack was disconnected from
the line during data calls isn't found much now with the cheaper modems.
The cost of that relay isn't something most consider now.

In some cases you may find that taking the phone off-hook before or
during the dialing might cause problems. Often the modem will hold
the line long enough after dialing that you can wait and pick up the
phone afterwards.

I use ACT to dial like this, there are many other programs that can
also dial calls for you.

-- Gary Breuckman

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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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