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Evaluation of Situations in Audible Automatic Dialling with
Confirmation
Situation
Intercom Action
Busy tone
Hangs up in approximately 2 seconds and dials the next number.
Call or silence
Waits for the preset timeout (log-in time), then hangs up and dials the
next number.
Ringing tone
Waits for the preset count of rings, then hangs up and dials the next
number.
Continuous tone (at
the PBX, e.g.)
Hangs up in approximately 2 seconds and dials the next number.
DTMF char
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.
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 the intercom cannot identify the DTMF, the
connection is established (yet for a shorter time).