FRITZ!Box 7490 Service - Knowledge Base

FRITZ!Box 7490 Service

FRITZ!Fon displays the message "IPEI invalid!"

The registration of FRITZ!Fon fails. The error message "IPEI invalid!" is displayed on the telephone's display.

1 Restoring the telephone to its factory settings

  1. Press the "Menu" key on the telephone.
  2. Scroll to "Settings" and press "OK".
  3. "Reset" > "OK" > "OK"

2 Re-registering the telephone