This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Maybe. One way is to use your in-home phone line. To connect, you take a
phone off the hook and connect using telecom programs on each computer. You can
connect and do transfers once the lines are free of beeps, tones, etc. which
indicate a phone is off the hook. If your phone company is one that keeps
beeping you forever, the connection will not work. An alternative which some
suggest is using a phone extension cord to connect the modems.
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By: Jeremy Penner
I've done this successfully (though not with an Apple ][) using this
simple procedure:
1) Dial your home-phone number on a regular telephone.
You should get a busy signal.
2) Hang up the phone. Your phone should now start ringing.
3) Give one computer the "ATA" command, while giving the other
the "ATX3D" command.
ATA causes the one modem to pick up the phone as if someone was dialing
into it, and ATX3D causes the other modem to pick up the phone and act as
though it had just dialed in someplace. This allows the two modems to
handshake, and you can go from there.
ATX3D should work with all Hayes-compatible modems. I can make no
guarantees that the phone-your-own-number trick works with all phone companies.
_________________________
By: Steph and Gist
 
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