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@
Converse at normal level. If desired, adjust earpiece volume
by pressing
I
VOL L
I
or
I
VOL \J
I .
NOTE
If the MUTE annunciator is on. you will be able to hear the other party, but
they will
NOT
be able to hear you. Pressing
I
MUTE
I
will reactivate the handset
microphone (unless the STU 111/SECTEL has been configured for ··clear mode
muted'".)
®
End call by hanging up or pressing
I
RESET
I
and dialing another
number.
Receiving a voice call in the clear mode is accomplished in the
same manner as an ordinary telephone.
G)
Lift the handset when the STU 111/SECTEL rings.
@
Converse at normal level. If desired, adjust earpiece volume
by pressing
I
VOL L
I
or
I
VOL \J
I .
NOTE
If the MUTE annunciator is on. you will be able to hear the other party. but
(J'J
they will
NOT
be able to hear you. Pressing
I
MUTE
I
will reactivate the handset
rrJ
microphone (unless the STU 111/SECTEL has been configured for "clear mode
(")
muted'".)
c::
:::0
@
End the call by hanging up.
rn
(")
NOTE
>
After
han~
handset. the ringer volume can be raised or lowered by
~
pressing~
or
[VOl37J .
(J'J
5·2
The primary function of the STU 111/SECTEL is the secure voice
•
mode of communication. The STU 111/SECTEL's sophisticated
cryptographic encoding and voice synthesization circuitry permits
communication over commercial phone services while ensuring
that only the authorized parties receive usable information.
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