I don't think that the mobile phone number, in the extension settings, is for the purpose of identifying incoming calls from that device, it's for outgoing functions such as ring my mobile. Matching to a name would have to be done in the phone book or local set directory.
How often is someone calling their own extension from their mobile?
You need to use contacts only to have name displayed when incoming call.
in extensions is for example to receive a voicemail file
Since when?Yes but i dont add a lots of contacts per hand. LDAP-Connections arent possible in the contacts. Why not?
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