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Re: New BT Charges and 1 hour phone calls. How to enforce them
- To: ukha_d@xxxxxxx
- Subject: Re: New BT Charges and 1 hour phone calls. How to
enforce them
- From: "patricklidstone" <patrick@xxxxxxx>
- Date: Thu, 08 May 2003 09:43:46 -0000
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
> > 4) Finally, is it possible without spending loads of money to
have
> the
> > computer conceptually 'pick up' another handset and give the
> warnings as
> > though they were another person on the line?
>
> Yes, this is possible. You'd need to build (or buy) a BT line
> interface to the sound card, and switch it in using your relay
setup.
> Simpler still would be superimposing an advisory tone - if your
tone
> generator is suitably high impedance, you should be able to get
away
> with doing it without needing relays. EPanorama is a good starting
> point for the design of this type of stuff, and I'm pretty sure
> Maplin will have a suitable interface available off-the-shelf.
Another thought... you could also do this by taking a voice modem off
hook and playing a WAV file.
Patrick
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