Panasonic KX-FG2452CX Service Manual page 45

6.8.7. Calling Line Identification Circuit (DTMF)
1. Function
1. This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. The data for the Caller ID from the telephone exchange is sent before the first ring signal. The
data from the telephone exchange is sent by DTMF signal.
1.
1. Circuit Operation:
1. The Caller ID signal from TEL LINE is processed with IC801.
1. Refer to Check Sheet for Signal Route (P.148) for the route of Caller ID (DTMF) signal.
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KX-FG2452CX