4. Terminology
Line pick-up/seizure/off-hook –
call start, line locked, busy.
Line hang-up/clear –
call end, handset hang-up.
DTMF –
dual tone multi-frequency signalling.
PSTN
– public switched telephone network.
Outgoing call – Helios
-telephone connection made, e.g. by a pressing a button.
Incoming call –
telephone-
Helios
connection.
Programming mode –
Helios
programming mode accessible from by dialling into the
intercom only.
Code lock –
mode for entering the password for switch 1 or 2 activation using a
numerical keypad.
Telephone mode –
you can make a call, dial a number and hang up using the
numerical keypad.
DTMF transmission during call –
for outgoing calls only, numbers are tone-dialled by
a numerical keypad button.
Button substitution –
the numerical keypad can be used instead of a number pre-
stored under a button memory.
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