In Cisco CallManager Administration, where do you place the most restrictive CSS?

A.
User

B.
Phone

C.
Gateway

D.
Directory number

Explanation:
Calling Search Spaces cannot be associated with a User. They can be assigned to a phone at the device level and to individual Directory Numbers on the phone. The more specific setting takes precedence over the more general one, so a Directory Number (or line) setting takes precedence over a general phone or device setting.