Panasonic KX-TDA15 - Manual (Page 134)

1.9 Using User-supplied Equipment
134 User Manual
1.9.3 If an External Sensor is Connected
Preprogrammed extensions can receive an alert call from an external sensor (e.g., security alarm)
connected to the PBX.
To answer a sensor call
• If you do not answer a sensor call within a specified time period, the sensor call will stop.
Off-hook.
PT/SLT/PS
On-hook.
D.Tone