In the U.S. and Canada, caller ID is transmitted as a Bell 202
modem signal between the first and second rings. The single-message format is the most commonly used and provides calling-number information, the date, and the time. By dialing *67, callers may block the transmission of their phone number, and a "P" (for private) appears in the number field. Calls from outside your area, on the other hand, are identified by an "O" in the phone field. If the subscriber picks up the receiver before the second ring, the caller ID is not transmitted. (Illustration courtesy of Motorola)
Flexible C++
Matthew Wilson
My approach to software engineering is far more pragmatic than it
is
theoretical--and no language better exemplifies this than C++.
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