caller id and a PIC

[temtronic]

curious, has anyone interfaced a 'caller id' chip to a PIC ?
I now get 40-50 spammers a day calling. Thought of dragging a WIN98SE/ QB45 PC up here but yeesh....using a PIC would be nice !
The actual code is simple .......

[Ttelmah]

I did it years ago with just a DTMF decoder chip. As you say the actual
code is simple. In the USA at least, there are a number of different
standard for this Bell 202, and ITU-T, that I can think of. The latter
is used on ISDN. So a dedicated decoder chip will probably be easier.
Look at the Holtek HT9032. However I think that is now EOL. I don't
know of any others that support both standards. The Bell 202 is easy
with something like the EM92547A.
Did it a decade ago, but not touched it since.
In the UK at least, there are legality issues with anything connected to
the phone network.
In the UK, the ID is sent before the first ring. I think the US sends it
between the first and second ring.
For your own use, I reckon you could even add simple code with a
known number database, and have it terminate the call for unrecognised
numbers!...