Auerswald COMpact 5200 Advanced Information page 600

Connexion PTP
The PBX offers the callback option to an external caller if the connection
they dialled is busy.
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.
Important: In addition, this function can often only be used if both call
partners are using the same network provider.
COMpact 5200/5200R/5500R - Firmware V7.4A - Advanced Information V08 06/2019
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