© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Get Started with Cisco Unified CallManager Release 5.0 Evaluating Cisco Unified CallManager Release 5.0 Deployment Options

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v IP WAN Call Processing Deployment Models Supported IP telephony deployment models: Single-site deployment Multisite WAN with centralized call processing Multisite WAN with distributed call processing Clustering over the IP WAN Headquarters Branch Applications Cisco Unified CallManager Cluster Applications Cisco Unified CallManager Cluster PSTN

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Single-Site Deployment SIP/SCCP Cisco Unified CallManager Cluster PSTN Cisco Unified CallManager servers, applications, and DSP resources at same physical location IP WAN (if one) used for data traffic only; PSTN used for all external calls Supports approximately 30,000 IP phones per cluster

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Single-Site: Design Guidelines Understand the current calling patterns within the enterprise. Use the G.711 codec; DSP resources can be allocated to other functions, such as conferencing and MTP. OffNet calls should be diverted to the PSTN or sent to the legacy PBX. Choose a uniform gateway for PSTN use. Deploy the recommended network infrastructure. Do not oversubscribe the Cisco Unified CallManager and clustering capability.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Multisite WAN with Centralized Call Processing Cisco Unified CallManager Cluster SIP/SCCP PSTN IP WAN Cisco Unified CallManager at central site; applications and DSP resources centralized or distributed IP WAN carries voice traffic and call control signaling Supports approximately 30,000 IP phones per cluster Call admission control (limit number of calls per site) SRST for remote branches AAR used if WAN bandwidth is exceeded

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Multisite WAN with Centralized Call Processing: Design Guidelines Minimize delay between Cisco Unified CallManager and remote locations to reduce voice cut-through delays. Use the locations mechanism in Cisco Unified CallManager to provide call admission control into and out of remote branches. SRST on the branch router limits remote offices to a maximum of 480 Cisco IP phones when using a Cisco 7200 Series router.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Multisite WAN with Distributed Call Processing Gatekeeper Cisco Unified CallManager Clusters Cisco Unified CallManager and applications located at each site IP WAN does not carry call control signaling Scales to hundreds of sites Transparent use of the PSTN if the IP WAN is unavailable Cisco Unified CallManager Cluster SIP/SCCP GK SIP/SCCP PSTN IP WAN

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Multisite Distributed Call Processing: Design Guidelines Use HSRP gatekeeper pairs. Deploy a single WAN codec. Implement a logical hub-and-spoke topology for the gatekeeper. Gatekeeper networks scale to hundreds of sites.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Clustering over the IP WAN First Node / TFTP QoS Enabled BW IP WAN

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Clustering over the IP WAN: Design Guidelines 40-ms round-trip delay between any two Cisco Unified CallManager servers in the cluster Minimum Mbps and 900 kbps for every 10,000 BHCAs within the cluster Up to eight small sites using the remote failover deployment model Failover across WAN supported (more bandwidth)

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v :1 Redundancy Design High availability (upgrade) Increased server count Simplified configuration Primary Secondary/ Backup First Node and TFTP Server (Not Req.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v :1 Redundancy Design Cost-efficient redundancy Service impacted during upgrade Primary Secondary/ Backup First Node and TFTP Server (Not Req.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Summary Supported Cisco IP telephony deployment models are single- site, multisite with centralized call processing, multisite with distributed call processing, and clustering over the IP WAN. In the single-site deployment model, the Cisco Unified CallManager applications and the DSP resources are at the same physical location; the PSTN handles all external calls. The multisite centralized model has a single call-processing agent; applications and DSP resources are centralized or distributed; and the IP WAN carries voice traffic and call control signaling between sites.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Summary (Cont.) The multisite distributed model has multiple independent sites, each with a call-processing agent, and the IP WAN carries voice traffic between sites but not call control signaling. Clustering over an IP WAN provides central administration, a unified dial plan, feature extension to all offices, support for more remote phones during failover, but places strict delay and bandwidth requirements on the WAN. Clusters provide redundancy. A 1:1 redundancy design offers highest availability but requires most resources.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v