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Murray Peterson

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Record off Phone Line?

(Isaac Grover) wrote in
om:

My initial goal is to capture the audio off the line and reconstruct
the audio into actual data that could be interpreted by me visually
with a hex editor.

It's just an analog audio signal of limited bandwidth -- not the sort of
thing that will be of much interest. However, if that's what you want,
just sample the analog stream with your PC sound card and store it to disk
(the soundcard will perform the required A/D conversion). There are many
tools (like Cooledit) that will allow you to examine and manipulate audio
data.

I'm interested in taking apart the data stream
that is sent to and from the CLEC.

What data stream? When you dial, you send a sequence of pulses or tones
(depending on your phone) to the local office . Once connected, you
send/receive analog voice signals. There is no "data stream" (or bits) to
be taken apart -- just an amplified audio signal from the telephone's
mouthpiece.

My final goal is to attempt to
inject/alter data in the outgoing stream, like altering the Caller ID
info, for example. It's just an intellectual challenge at this point,
and I'm not even sure it can be done.

Caller ID info isn't sent from your telephone, so you can't possibly alter
it. And if you don't pay for the service, your telco won't send any caller
ID to your phone either. If you do have caller ID, here is a FAQ that
describes the protocol:
http://www.repairfaq.org/filipg/LINK/F_CallerID.html

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