phone lines

i want to know if it is possible to (and the code for it)

A) detect if the phone line is in use
B) allow the phone conversations to be monitored on the pc speakers
C) act as a caller ID box and retreive that info

im looking for more of a already done project, more than i am looking for codes on the internet and compiling them all into one project to suit my needs.
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MTec89_Author Commented:
still a waitin:P
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