Auto Disconnect Circuit - Panasonic KX-TG2359BXB Service Manual

17.7. Auto Disconnect Circuit

Function:
This circuit is used to detect the fact that another telephone connected to the same line is OFF-HOOK while the unit is in a receiving
status or OGM transmitting status.
Circuit Operation:
The voltage of pin50 of IC501 is monitored. If a parallel-connected telephone is put into OFF HOOK status, the presence/absence
of a parallel connection is determined when the voltage changes by 0.2V or more.When the set detects the parallel-connected
telephone is OFF HOOK status, the line is disconnected.
You can enable or disable the Auto Disconnect function.
See Check Record (P.49)
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KX-TG2359BXB