© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Improving and Maintaining Voice Quality Implementing CAC

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Outline Overview Effects of Oversubscribing Bandwidth CAC Operation Resource Reservation Protocol CAC Tools H.323 CAC SIP CAC MGCP CAC Cisco CallManager CAC Summary Lesson Self-Check

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Effect of Oversubscription

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Call Control Approach to CAC

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Resource Reservation Protocol RESV = reservation request

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Understanding CAC Tools H.323 CAC SIP CAC MGCP CAC CallManager CAC

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v H.323 CAC call threshold {global trigger-name | interface interface-name interface-number int-calls} low value high value [busyout | treatment] call spike call-number [steps number-of-steps size milliseconds] call treatment {on | action action [value] | cause-code cause-code | isdn-reject value}

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v SIP CAC SAA RTR Responder –rtr responder PSTN Fallback –call fallback active Resource availability check –call threshold global trigger-name low value high value [busyout][treatment] –call treatment {on | action action [value]| cause-code cause-code | isdn-reject value} –call threshold interface interface-name interface number int-calls low value high value

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v MGCP CAC System Resource Check (SRC) CAC call threshold global trigger-name low value high value treatment Resource Reservation Protocol (RSVP) CAC ip rsvp bandwidth [interface-kbps [single-flow-kbps]] Cisco Service Assurance Agent (SAA) CAC call fallback active mgcp rtrcac rtr responder

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v CallManager CAC Locations CAC Gatekeeper zone CAC

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v Summary If a network link is oversubscribed with too much voice traffic, data packets are dropped and voice calls suffer. CAC functions as part of call control services. RSVP is a CAC mechanism. Various CAC tools are available for different protocols and systems. –Cisco provides for H.323 Call Admission Control. –Cisco provides for SIP Call Admission Control. –Cisco provides for MGCP Call Admission Control. –Cisco CallManager allows for two types of call admission.

© 2006 Cisco Systems, Inc. All rights reserved. CVOICE v