As Tim mentions there have been other complaints. And, justifiably so - the UI for this feature (to put it very bluntly) would not getting a "passing grade" in any kind of UI review. Yes, adding a label (non-modifiable) field with the currently set caller-id value should be fairly simple (and would give it that "passing grade") :-).
Do note there are people with great programming skills and next to no UI skills (I've been doing both - programming with some UI now and then - for many many years).
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