Auerswald COMpact 5200 Advanced Information page 546

Settings – Réseaux publics
Voix sur IP (VoIP)

When an external phone number is forwarded, the call can be
forwarded via a call channel on any of the other ports.

A call can only be redirected via a call channel on the same port. The
probability that the call cannot be forwarded because the channels are busy
is therefore higher.
Renouveler le transfert d'appel en cas de redémarrage du système

When rebooting the PBX, the saved data of the call forwarding is
renewed.
Important: In Switzerland, the configuration of a call forwarding is
chargeable. To avoid costs, the check box must be disabled.
Delay time for Call Forwarding on no reply in the PBX
This delay time for external numbers specifies the time (in seconds) after
which a call is forwarded if the called subscriber does not respond.
Note: The waiting time applies only to call forwarding that was set up
using the PBX. If the network provider has configured the call forwarding
function, the waiting time depends on their settings and cannot be
configured in the PBX.
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COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018