elmo@bu-it.BU.EDU (12/27/88)
Bernie Cosell suggests: How about instead of 3-way calling you simply get "call forwarding" and forward all calls to your outgoing lines to some nonexistent place (maybe back to your incoming trunks :-). Call-forwarding loop-prevention provides a means to break this approach. If the hacker has a line in your central office (same machine), the "set-up" call for call-forwarding FROM HIS line will ring through on your already-forwarded line. And all of this is silly if your hacker is tapping the line and listening with his hayes in ham mode. Encryption is the *only* way to go.