The easiest way to set up call forwarding is to use the TK-Portal.

To set up call forwarding click on the gear next to the Call forwards function. This will open a pop-up window.

In this window you have the possibilities to set up call forwarding for different states:

• all calls
• calls received when line is busy
• unreceived calls
• calls during no network coverage
• calls while no phone is registered

You will receive three options for where calls are forwarded:

• Do not forward (deactivates call forwarding)
• Voicebox (forwarding to a Voicebox (which must be active))
• New number (forwarding to a phone number). Please ensure that the correct notation is used:
  • XXXXX (for RWTH internal numbers)
  • External numbers with a leading 0 (0151xxxxxxxx)
  • or external numbers in the E.164 format (+49151xxxxxx)

If you select the call not received, you can also select a time limit, after which a given call will count as not received.
The 4 second steps for this option are roughly equivalent to one ring of the phone.