> How do I use a PIC to monitor outgoing calls and log them out a serial
> port.
>
> Has anyone done this in Australia for our Telephone system????

I saw this done years and years ago in an ETI magazine. They were
using an 8051 or 8032 or something but the basics were the same.
Back then however, DTMF didn't exist (in the UK/Ireland) and
if I remember correctly, they had some sort of opto isolated link
to the phone line. They had a much easier job of it as they
could detect the break/make pattern of a dial out. DTMF will make
detection more work. If you really wanted to monitor calls properly,
you might want to check both pulse and tone dials.
Anyway, there's a great DTMF faq at:

http://www.paranoia.com/~filipg/LINK/F_DTMF.html

Hope this helps a bit.

Conor.