Settings > Identification > MSN

In order for the PBX to identify the telephone, the internal number (MSN) for the telephone must be entered.
Important: Use each of the internal subscriber numbers for only one of the devices.
Proceed as follows:
Using the configuration manager (page Settings/functions > Basic settings, entry field Internal number)
Using the telephone (menu settings > def. settings > MSN)

COMfortel 1400 - Firmware V2.2 - COMfortel Set V3.16 - Advanced Information V07 02/2019