Any positive talk of using POTS lines was someone else, or me answering Mike.
POTS lines are not really an option because that ties essential kit to a physical location. It would also involve a cease/reprovide to another location should a committee member resign.
I believe that you can do call screening with just a modem - this picks up the call immediately and screens it, then either drops the call or holds it for a handset.
I can't remember how it generates a ring tone to indicate that a call has passed screening.
There is a wealth of information out there - but it is a while since I read up on it and can't find the specific software I was proposing to use. I think it was a variant of Asterisk, but wouldn't swear to it.
discusses one aspect - which suggests that a PCI modem in a PC may be more effective than a USB modem with a Pi for some functions.
Anyway, if you Google for call screening blocking Pi you should find loads of useful information.
If I find the original link I will post it.
Cheers
Dave R
If there is broadband Internet access available, there is absolutely no need to get a second physical landline installed, with its attendant installation and line-rental costs.
All that is needed, is an IP phone or ATA plugged into the existing router which will cost about £20, and a free account with Sipgate Basic which includes a phone number of the geographic STD area of your choice.
An excellent voicemail service is also included.
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