Its; Monitor Section - Panasonic KX-FP70CX Service Manual

6.7.7. Calling Line Identification Circuit (DTMF)
1. Function
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.
2. Circuit Operation:
The Caller ID signal from TEL LINE is processed with MODEM (IC5).
Refer to 12.5.6.1.Check Sheet for Signal Route (P.124) for the route of Caller ID (DTMF) signal.
6.8. ITS (Integrated telephone System) and Monitor Section
6.8.1. General
The general ITS operation is performed by the special IC505 which has a handset circuit. The alarm tone, the key tone, and the
beep are output from the ASIC IC1 (digital board). During the pulse dial operation, the monitor tone is output from the ASIC IC1.
6.8.2. Telephone Monitor
1. Function
This is the function when you are not holding the handset and can hear the caller's voice from the line.
2. Signal path
Refer to 12.5.6.1.Check Sheet for Signal Route (P.124).
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KX-FP701CX/KX-FP702CX