How does the Cisco Unified CallManager use RSVP?

A.
it uses RSVP reservations to request double the bandwidth so calls can flow in both directions

B.
it uses the RSVP-configured bandwidth between sites as a method of determining if there is sufficient bandwidth for a call

C.
it uses an RSVP-enabled infrastructure and an RSVP agent controlled by Cisco Unified 110
Cisco 642-447 Exam
CallManager to request a bandwidth reservation from the network in order to place a call

D.
it initiates RSVP reservations from the Cisco Unified CallManager server, which is an active participant in the reservation process

Explanation: