Observation
None/not all colleagues' phone numbers are displayed under "Channels" in Monitor/Favorites.
Solution/Procedure
Please check whether the affected line in the UCServer is otherwise assigned to the user as Business (primary line) or Business 2 (secondary line).
Possible reason/explanation
Only "Business" (primary line) and "Business 2" (secondary line) phone numbers are displayed under "Channels" in the teammate's Monitor/Favorites.
All other lines (Other lines of the user) are not displayed.
If the phone number assignment in the UCServer is changed, the UCServer must be restarted for the change in permissions to take effect.