NEC ELECTRA ELITE IPK II - NEC Push-To-Mute (PTM) or Push-To-Talk (PTT) Handset; Description

Electra Elite IPK II Document Revision 3
System Hardware Manual 9 - 69
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3.12 NEC Push-to-Mute (PTM) or Push-to-Talk (PTT) Handset
3.12.1 Description
The PTM (780503) or PTT (780504) handset has a single-pole,
single throw switch that must be continuously held down to provide
the feature.
These replacement handsets for DTH/ITH terminals help to ensure a
secure telephony environment by keeping unwanted audio from
being transmitted over the corporate telephone network.
Using the PTM or PTT handset on an NEC digital or IP terminal
prevents eavesdropping and eliminates the worry that privileged
information could be transmitted without user authority. These
handsets are also an ideal solution to filter unwanted audio
transmissions from environments with ambient background noise.
Figure 9-67 NEC PTM or PTT Handset