Panasonic KX-TG6440PK Service Manual page 18

KX-TG6440PK/KX-TGA641S/KX-TGA641T/KX-TGA740B
4.4.8. Calling Line Identification (Caller ID)/Call Waiting Caller ID
Function:
Caller ID
The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company
to utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been
entered for the circuit being used. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an FSK
(Frequency Shift Keying) * format. Data
the message format which can be received: i.e. the single message format and plural message format. The plural message for-
mat allows to transmit the name and data code information in addition to the time and telephone number data.
*: Also the telephone exchange service provides other formats.
1 is a 1200 Hz sine wave, and data
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0 is a 2200 Hz sine wave. There are two types of
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