Voice Mailboxes on the PBX > Voice Mailbox > Automatic Operation

Automatic Operation
If you have used VMB readiness to switch a voice mail/fax box on or off, independently of the PBX configuration, you can use this function to reset the box to the PBX configuration and the state of readiness specified there.
Proceed as follows:
Using the telephone (function key or  > Functions > VMB automatic mode)
VMB number 
Enter the voice mailbox number.

COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.8 - Advanced Information V08 12/2020