34.3 Operator Service Features EDPT Features 4-145Secondary switch1. Lift the handset or press the SP-PHONE/MONITOR button.2. Dial the feature number (793).3. Dial the extension number.• You hear a confirmation tone and then a dial tone.• The display shows:— (xxxx : extension number)4. Hang up or press the SP-PHONE/MONITOR button.Programming References• System Programming — Installation Manual[100] Flexible Numbering, Primary COS select, secondary COS select[601] Class of Service[991] COS Additional InformationExternal SensorWhen a device connected to the external sensor becomes active, the alarm tone is sent to theoperator 1.If you hear the alarm tone;• The display shows:— (x : External Sensor number)— If you are connected to the KX-TD1232, the display shows theexternal sensor number 1 or 2.1. Lift the handset or press the SP-PHONE/MONITOR button.• You hear a special dial tone (Tone 3).Conditions• One external sensor can be connected per system.• If you do not answer the alarm tone within 60 seconds, it will automatically stop ringing.• If you go off-hook while the alarm is ringing, you will hear a special dial tone through thehandset.• If Operator 1’s line is busy when the external sensor sends an alarm, the alarm will startringing when the line becomes free.1xxxx : SecondaryExt. Sensor x13extension number247 9