The caller's number is not displayed.
•Calling Line Identification (CLI) is not enabled for the caller. The caller should ask the network provider
to enable Calling Line Identification (CLI).
•Calling Line Identification Presentation (CLIP) is not supported or enabled by the network
provider. Ask the network provider to enable Caller Line Identification Presentation (CLIP).
•The telephone is connected via a PABX or a router with an integrated PABX (gateway) that does not trans-
mit all information.
¥Reset the system: Briefly pull out the power plug. Reinsert the plug and wait until the device restarts.
¥Check the settings on the PABX and activate phone number display, if necessary. To do this, search for
terms such as CLIP, calling line identification, telephone number identification, caller ID, ... in the sys-
tem user guide or ask the system manufacturer.
You hear an error tone when keying in (descending tone sequence).
•Action has failed/invalid input. Repeat the process. Read the display and refer to the user guide if nec-
You cannot listen to messages on the network mailbox.
•Your PABX is set to pulse dialling. Set your PABX to tone dialling.
No time is specified for a message in the call list.
•Date/time are not set. Set the date/time.
Registration or connection problems with a Bluetooth headset.
¥Reset the Bluetooth headset (see headset user guide).
¥Delete the registration data on the handset by de-registering the device ( p. 70).
¥Repeat the registration procedure ( p. 70).
Internet telephony not possible.
•No IP account has been set up: Register the phone with your provider for Internet telephony ( p. 15)
•Display shows Provider error registration failed: Registration of the phone with your provider for Internet
telephony has failed. Repeat the process ( p. 15). Check registration status in web configurator if nec-
essary ( p. 106).
•Display shows No IP connection: No IP account configured or the IP connections have been deactivated
No connection to the Internet.
•Display shows No LANconnection: Check cable connection between router and base.
•Display shows IP address not available: Check IP configuration.
The phone is preconfigured for dynamic assignment of the IP address. In order for your router to
"recognise" the phone, dynamic IP address assignment must also be activated on the router, i. e. the
router's DHCP server must be activated.
If the router's DHCP server cannot be/is not activated: Assign a fixed IP address to the phone.
•Display shows Check IP settings: The telephone is not connected to the Internet.
¥Check the cable connections between the base station and router and between the router and the
¥Check the telephone's connection with the LAN, check whether the phone can be contacted at its IP
address. Check the IP address on the handset.
•Display shows Internet connection not available:
Connection to the Internet has been interrupted: Please try again later
Otherwise: Check the plug connection between the router and modem or DSL connection and the