Auerswald COMpact 5200 Advanced Information page 468

Settings – Réseaux publics
Connexions RNIS

The PBX offers the callback option to an external caller if their call is
not answered.
Important: If this function is enabled, but the network provider does not
support it (service feature not unlocked), it might still happen that the
caller is given the option of a callback. In this case, the caller's reply is
not forwarded to the PBX and therefore the function cannot be
performed.
Ringtone for the PTP connection/bundle mentioned above
The ringtone specifies which sequence of sounds is used to signal external
calls to the phone numbers of the PTP connection to internal subscribers on
the PBX.
Notes:
Individual ringtones can be assigned to extension numbers that were
input in different ways.
See the Functions, Uses, Concepts > Ring tones section for information
about exceptions to signalling and sound sequences.
Général
Indicatif international
International phone prefix (e. g. 0044 for the UK).
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COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018