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[Yealink Support]

Hi Henri,
You want to display the caller ID on the phone, right?
1. If this incoming number is in your local phonebook, it will display;
If it's in your remote phonebook, you can enable "SRemote Name" in the phone webpage-Phone-Features-General Information
Then it will search in the remoter phonebook and display the caller name.
2. Because the Caller ID is read from 'From' header field, some PBX will sent Caller ID to 'From' header field, and the phone will display it.