2N LiftNet, User Manual

Page: 73 / 99

Dispatching Centre Instructions 4.2
73
Tone Dialling Control during Call
– Complete List of
Commands
Where automatic dialling with confirmation is used, it is possible to use tone dialling
for LN control during the call according to the table below. For simplification,
commands 1 to 5 are arranged in the sequence they are usually used in.
DTMF char FUNCTION details
Only where automatic dialling repetition is enabled. The character is
used to confirm a successful call to LN. LN
mutes the played-back
message and, optionally, sends the identification code (DTMF). The
call goes on until the timeout end and any of the following commands
may be used.
Voice module muting. CAUTION: Now this function is no more
necessary for calling due to a software change.
Repeated voice module playback, for 1 replaying of the message .
Call prolongation: The call is prolonged as defined in parameter 912
(120 seconds by default) in case it ended earlier without this
command. May be used repeatedly.
or
Call termination.
LN identification (without confirmation). This command is used by
automated workplaces. The LN sends the identification code.
The car audio unit is muted for 5 seconds during Alarm call (one-way
communication from operator / dispatcher to car). This feature is
mainly intended when big noise is in car (e.g. children crying) and
operator needs to communicate whole information to person in cabin.
to
These digits are reserved for other commands, e.g. „rescue
confirmation".
This table applies to the Automatic Audible Dialling with Confirmation mode.
Warning

Rarely, LN may not identify the above listed commands reliably during
message playing or voice communication. This is due to the essential
principle of the telephone line function where DTMF signalling is mixed
with the talk and thus may be hidden behind some speech tones or noise.
Hence, this phenomenon is not a defect of the product.