NEC Electra Elite IPK II Features And Specifications Manual page 448

Document Revision 1
Programming
15-07-01 Programmable Function Keys
Assign a function key for Handset Transmission Cut Off (code 40).
80-01-01 Basic Hardware Setup for System
Service Tone 25 (Service Set Tone), this option allows the service set tone to be disabled.
Operation
While talking on a terminal handset:
1. Press MIC key (DTH/DTR terminals only).
- OR -
2. Press the Feature key + dial 1.
- OR -
3. Press the Handset Transmission Cut Off key (PRG15-07-01; Key 40 or SC 751 Key Code 40).
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Electra Elite IPK II
Handset Mute