2N Helios Vario Installation Manual page 60

If the ringing tone stops before the predefined count of rings is achieved and the call is
thus very short (e.g. 2 seconds), it is not clear whether the call should be regarded as
successful. Therefore, a new type of automatic dialling has been added – type 4.
The difference is as follows:
Type 3 regards such a call as successful only if the door is opened.
Type 4 regards all such calls as successful.
Automatic Multiple Number Dialling with Confirmation
This mode is used where maximum connection reliability is required – for emergency
calls. The called line (the supervisory control centre, e.g.) must be operated by a
well-trained person to confirm connection. The DTMF is used as the most reliable
criteria for successful connection. The called line must press
called number is busy or remains unanswered until the preset timeout or in other cases
(see the table),
Evaluation of Situations in Audible Automatic Dialling with Confirmation
Busy tone
Call or silence
Ringing tone
Continuous tone (at
the PBX, e.g.)
DTMF char
DTMF char
Note
®
2N TELEKOMUNIKACE a.s., www.2n.cz
®
2N Helios
Situation
Hangs up in approximately 2 seconds and dials the next
number.
Waits for the preset timeout (log-in time), then hangs up and
dials the next number.
Waits for the preset count of rings, then hangs up and dials the
next number.
Hangs up in approximately 2 seconds and dials the next
number.
or
Immediately hangs up and dials the next number.
Confirms reception (2 beeps) and the call continue for the
preset time at most (maximum call duration).
These digits are interpreted as control characters – refer to the
DTMF Control subsection.
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 2N
established (yet for a shorter time).
dials the next number in the sequence.
®
2N
®
Helios cannot identify the DTMF, the connection is
on its telephone. If the
Helios Action
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