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642-445 - Cisco IP Telephony for Release 5.x
How does the Cisco Unified CallManager use RSVP?
it uses RSVP bandwidth and zones to determine how and if calls can be placed
it uses the RSVP-configured bandwidth between sites as a method of determining if there is sufficient bandwidth for a call
it initiates RSVP reservations from the Cisco Unified CallManager server, which is an active participant in the reservation process
it uses an RSVP-enabled infrastructure and an RSVP agent controlled by Cisco Unified CallManager to request a bandwidth reservation from the network in order to place a call
it uses RSVP reservations to request double the bandwidth so calls can flow in both directions
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