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Why does the name of the caller not shown on the display?
You can set the Display of caller’s name option, depending on the provider
selected. This means that the name of the caller is read from the net directory for
incoming calls and shown on the display (where the handset's local directory
does not contain an entry for the caller's number).
You can activate the Display of caller’s name option via the Web Configurator:
Settings - Online Directory