It really shouldn't make that much of a difference, in those terms.
That its not on the TV, yes is an inconvenience, but shouldnt change about how you see the caller ID.
The info is still sent. And 90% of the phones will have caller ID on the phone itself. It will still be visible there, and can still choose to not answer when looking at the phone.
Is the on-screen caller ID feature available with Ignite TV? We haven't been able to find a setting for it and it doesn't appear on the screen since we switched to Ignite.