SOURCE: How to turn on caller
CID is part of the phone system and requires a -93 card and system programming. Panasonic makes different systems that the 7730 phone works on, but it was first delivered with the TA-824 or equivalent system. It also needs to be programmed to tell it how may lines are equipped. Then, when you dial "9" to get an outside line, it will grab the highest WORKING line, instead of just the highest line.
FInd the model number on the system cabinet and do an internet search for the installation manual of the system.
Carl
SOURCE: Can I connect Panasonic KX-T7730
What? A 7730 is a Panasonic system phone that connects to one of about 18 different Panasonic phone systems. You can connect a single line set in parallel with the PT if you tell it so in software.
Carl
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