On Tue, 19 Aug 1997 20:02:35 +0100, Tim Kerby
<tim.kerby@UKONLINE.CO.UK> shaped the electrons to say:

>Hi
>I need to connect a modem to a telephone handset in a phonebox to access
>email from my psion organiser's modem.  Does anyone have any details of a
>simulated phone line (incomming ring not needed) that coulb be connected to
>a phone handset.  I am working on making a battery powered box to do this.
>Preferably to use uk compatible signal but US will do as the changeover is
>very simple.
>
>
>Any ideas?

What kind of phone - a KSU? On Merlin and Comdial systems (probably
other analog systems, as well) all you have to do is tap into the
voice pair (on Comdial, that's the red & green, on Merlin, it's the
first pair if the cable is wired properly). 

In this arrangement, you pick up a line via the phone to get
dial-tone, _then_ dial out on your computer (Psion...). When you're
done, you hangup the phone. It's a bit kludgy for redial etc., but it
works and can be done at your phone, without having to rewire.

I've done it on a Comdial, using a 2400 baud modem and it worked fine.
Don't know if there's a speed llimitation.

Chris


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                  Christopher Zguris  -  czguris@interport.net
                                HSTA, HRCA, AMA
 
            In 1803, the British posted a military detachment on the
          cliffs of Dover to look out for Napoleon. He died in 1821.
                 They stopped funding that guard unit in 1927.
 
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