Questions and answers
COMfortel M-520 - Advanced Information V01 08/2019
47
The caller's number is not displayed.
•
Calling Line Identification
(CLI) is not enabled for the caller.
The
caller
should ask the net-
work 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 PBX or a router with an integrated PBX (gateway) that does
not transmit 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 PBX 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 system 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 necessary.
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. 35).
¥
Repeat the registration procedure (
p. 35).