Auerswald COMpact 5200 Advanced Information page 430

Settings – Réseaux publics
Connexions analogiques
You can always press # (the hash key) when you finish dialling the phone
number to keep the waiting time between dialling the last number and
the connection being set up to a minimum. The PBX recognises this
character as the end of the phone number.
Transmit #

The PBX transmits the # (hash key) character, appended to the
number you are dialling, used to signal that you have finished, to the public
exchange.
Reconnaissance de la tonalité occupée

The PBX recognises the busy signal sent by the public exchange
(recommended setting).
This is needed to allow the CCBS (callback when busy) function to be
enabled using the PBX's internal phones.
Max. hold time until audio connection established (0-30 seconds)
The time to wait until the audio connection is created specifies the maximum
time, in seconds, that the PBX will wait for the connection information sent
by the public exchange. If the PBX does not receive a busy signal, a
continuous tone or a polarity reversal of the line after this time has passed,
it creates the connection.
The PBX also creates the connection if it detects a call tone, and then a
voice, even before the waiting time has passed.
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COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018