Chapter 4. Designing Unified CVP for High Availability

This chapter covers the following subjects:

• Unified CVP geographic models: Single site, multisite, multisite with distributed call processing and clustering over the WAN.

• Edge queuing techniques and call survivability: Edge queuing techniques including Set Transfer Label, Send to Originator, H323/SIP Significant Digits, and LBCAC configuration and call survivability options for edge devices.

• SIP high-availability architectures: HA designs for SIP-related components such as Ingress Gateways, proxies, and the Unified CVP SIP Service.

• H.323 high-availability architectures: HA designs for H.323-related components such as Ingress Gateways, gatekeepers, and the Unified CVP H.323 Service.

• Content services high-availability architectures: HA designs for content services components such as Content Services Switch, Application Content Engine (ACE), media servers, and VoiceXML Servers.