Calling Line Identification (Caller Id)/Call Waiting Caller Id - Panasonic KX-TG2344B Service Manual

KX-TG2344B / KX-TGA234B

15.9. 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 "1" is a 1200 Hz sine wave, and data.... a 2200 Hz sine wave.There are two types of the message
format which can be received: i.e. the single message format and plural message format. The plural message format 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.
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