During a telephone call, a party to the call may signal (by, for example,
sending certain DTMF tones (a wish to provide his or her location to the other
party to the call. The central office responds to this request by accessing a subscriber
record for the communication line (e.g., subscriber loop) terminating at the requesting
party and sending location information in the subscriber record to the other party
to the call. Depending upon the technology available, the location information
may be supplied in-band or on a parallel datapath.
