Panasonic KX-TEA308CE

4) CALL ID interface circuit
It is insulated by the capacitors in a COL circuit, and the call ID signal inputted from outside line is transmitted to a CALLID
option card.
The flow of a CALLID signal
Tip→L1→C29→R54→IC4
Ring→L1→C29→R55→IC4
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KX-TEA308CE