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2N Helios Manual

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Note: It is sometimes difficult to recognise the above-described situations reliably due to
a poor quality of the PSTN connection. Excessive noise in the surroundings may also
have a negative impact. However, this may only decelerate automatic dialling (the busy
tone may not be recognised, e.g.). Even if Helios
cannot identify the DTMF, the
connection is established (yet for a shorter time).
Silent Automatic Multiple Number Dialling
This mode fully conceals the fact that a telephone call is made. When a button is
pressed, the loudspeaker is off and no PBX or dialling tone can be heard. The
loudspeaker is switched on when the called subscriber confirms connection (by
pressing
on its telephone). Thus, a potential thief cannot establish whether the called
person is in the building or not.
Otherwise, the function is the same as with Automatic Multiple Number Dialling
with Confirmation.
Messages
There are situations in which the calling person does not want to or cannot speak
for security reasons in the automatic dialling mode. In these cases, Helios
can play
back a message stored in its memory. The test series includes the “Wait please,
connection is being established" message. Later, more messages will be available to
the user.
DTMF Control
If Automatic Multiple Number Dialling with Confirmation or Silent Automatic
Multiple Number Dialling is enabled, Helios can be controlled as shown in the table
below. For convenience, commands 1 to 5 are arranged as they are usually used.
DTMF
CHARACTER
FUNCTION
Confirmation indicating to Helios that a call was successful.
Helios sends its confirmation signal, the call goes on until the end
of timeout and any of the following commands can be used.
Message muting (during playback).
WARNING! You may not speak while Helios is playing back the
message!!!
Message re-plays (once).
or
Call extension: a call is extended by 30 seconds by this
command. Can be used repeatedly.
or
Call termination.
to ,
These digits are interpreted as a password beginning - for switch
control.
Notes:
• These commands do not work in the Automatic Multiple Number Dialling mode
without Confirmation!
• The above-mentioned commands
may not be accepted due to poor connection if
sent during a message. To avoid this, press the button during the time of silence
(between messages).
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