© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Module Summary Call admission control limits the number of calls and controls the WAN bandwidth required for voice call quality. There are two general methods available: Non-network-aware and Network-aware. Non-network-aware uses locations-based call admission control in centralized deployments and gatekeeper call admission control in distributed deployments. Network-aware uses RSVP to improve central knowledge about available WAN resources in centralized deployments. AAR applies to centralized deployments and allows calls to be rerouted through the PSTN when Cisco Unified CallManager blocks a call due to insufficient WAN bandwidth.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Module Summary (Cont.) Locations-based call admission control involves configuration of regions and Locations. RSVP extends call admission control with RSVP agent configuration. H.323 gatekeeper is needed for gatekeeper-based call admission control. In centralized deployments, the SRST router provides a subset of Cisco Unified CallManager call-processing features to both SCCP and SIP phones at a remote location in the event of a Cisco Unified CallManager or IP WAN failure.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v5.05-3