With the "Call through" function, simply enter a destination number to route incoming calls over FRITZ!Box.

 Call through enabled

Authorization for Call Through

With PBX linking, FRITZ!Box can be connected with a PBX. This allows calls to be conducted via the Internet with all those telephones connected to the linked PBX.

Connection to the linked PBX

Connect the fixed-line port of FRITZ!Box (labeled "ISDN/analog") with an extension of your PBX.

Calls from the Internet

 do not divert to the linked PBX

 divert to the linked PBX with the
number 

Calls from the linked PBX

divert via the Internet number

 use automatic outside dialing

Calls from the extensions connected to FRITZ!Box into the fixed-line network

Digits for outside dialing prefix

Outside dialing prefix