NEC Univerge SV8100 System Hardware Manual page 745

UNIVERGE SV8100/SV8300
4.3
System Hardware Manual
NEC Push-to-Mute (PTM) or Push-to-Talk (PTT) Handset
4.3.1 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 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 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 13-34 NEC PTM or PTT Handset
Issue 1.0
13 - 33