Caller ID on Call Waiting displays the number (and optionally the name) of an incoming caller when the user is already on the phone. Because it indicates visually that a new call has arrived, it serves as a supplement to Call Waiting. This is a useful feature for people with sufficient hearing loss that the usual Call Waiting tone is inaudible.
Caller ID on Call Waiting addresses:
1193.43(d) Availability of auditory information.
There are no Product Types that generically include Caller ID on Call Waiting (aside from Caller ID on Call Waiting displays).