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Understanding Cisco Unified Communications Manager Deployment and Redundancy Options. Getting Started with Cisco Unified Communications Manager. Outline. Cisco Unified Communications Manager Deployment Options Cisco Unified Communications Manager Single-Site Deployment - PowerPoint PPT Presentation
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© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-1
Getting Started with Cisco Unified Communications Manager
Understanding Cisco Unified Communications Manager Deployment and Redundancy Options
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-2
Outline
Cisco Unified Communications Manager Deployment Options Cisco Unified Communications Manager Single-Site Deployment
Cisco Unified Communications Manager Multisite Deployment with Centralized Call Processing
Cisco Unified Communications Manager Multisite Deployment with Distributed Call Processing
Cisco Unified Communications Manager Multisite Deployment with Clustering Over the WAN
Cisco Unified Communications Manager Call-Processing Redundancy
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-3
Cisco Unified Communications Manager Deployment Options
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-4
Cisco Unified Communications Manager Deployment Options
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
IP WAN
Headquarters
Branch
ApplicationsUnified CM
ClusterApplications
Unified CMCluster
PSTN
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-5
Cisco Unified Communications Manager Single-Site Deployment
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-6
Single-Site Deployment
Cisco Unified Communications Manager servers, applications, and DSP resources are at the same physical location.
IP WAN (if one) is used for data traffic only; PSTN is used for all external calls.
Supports approximately 30,000 IP phones per cluster.
SIP/SCCP
Cisco Unified CM Cluster
PSTN
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-7
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 Communications
Manager and clustering capability.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-8
Single-Site: Benefits
Ease of deployment
A common infrastructure for a converged solution
Simplified dial plan
No transcoding resources required, due to the use of only a single high-bandwidth codec
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-9
Cisco Unified Communications Manager Multisite Deployment with Centralized Call Processing
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-10
Multisite WAN with Centralized Call Processing
Cisco Unified Communications Manager 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.
SIP/SCCP
SIP/SCCP SIP/SCCP
PSTNIP
WAN
Cisco Unified CM Cluster
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-11
Multisite WAN with Centralized Call Processing: Design Guidelines
Maximum of 1000 locations per Cisco Unified Communications Manager cluster.
Maximum of 1100 H.323 devices (gateways, MCUs, trunks, and clients) or 1100 MGCP gateways per Cisco Unified Communications Manager cluster.
Minimize delay between Cisco Unified Communications Manager and remote locations to reduce voice cut-through delays.
Use the locations mechanism in Cisco Unified Communications Manager to provide call admission control into and out of remote branches.
SRST on the branch router limits remote offices to a maximum of 720 Cisco IP phones when using a Cisco 3845 Series router.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-12
Multisite WAN with Centralized Call Processing: Benefits
A common infrastructure for a converged solution. PSTN call cost savings when using the IP WAN for calls between
sites. Use of the IP WAN to bypass toll charges by routing calls through
remote site gateways, closer to the PSTN number dialed. This practice is known as tail-end hop-off (TEHO).
Maximum utilization of available bandwidth by allowing voice traffic to share the IP WAN with other types of traffic.
Use of Extension Mobility features between sites. Use of AAR in the case of insufficient bandwidth. Centralized administration.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-13
Cisco Unified Communications Manager Multisite Deployment with Distributed Call Processing
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-14
Multisite WAN with Distributed Call Processing
Cisco Unified Communications Manager and applications are located at each site.
IP WAN does not carry intrasite call control signaling.
Gatekeepers can be used for scalability.
Transparent use of the PSTN if the IP WAN is unavailable.
GatekeeperSIP/SCCP
SIP/SCCP SIP/SCCP
PSTNIP
WAN
Cisco Unified CM Cluster
Cisco Unified CM Clusters
GK
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-15
Multisite Distributed Call Processing: Design Guidelines
Deploy a single WAN codec Gatekeeper networks scale to hundreds of sites
– Implement a logical hub-and-spoke topology for the gatekeeper
– Use gatekeeper redundancy
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-16
Multisite WAN with Distributed Call Processing: Benefits
PSTN call cost savings when using the IP WAN for calls between sites.
Use of the IP WAN to bypass toll charges by routing calls through remote site gateways, closer to the PSTN number dialed, that is, TEHO.
Maximum utilization of available bandwidth by allowing voice traffic to share the IP WAN with other types of traffic.
No loss of functionality during IP WAN failure, because there is a call-processing agent at each site.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-17
Cisco Unified Communications Manager Multisite Deployment with Clustering Over the WAN
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-18
Clustering Over the IP WAN
Applications and Cisco Unified Communications Manager of the same cluster distributed over the IP WAN.
IP WAN carries intracluster server communication and signaling.
Limited number of sites.
Publisher / TFTP
QoS Enabled BW
IP WANIP WAN
<40-ms Round-Trip Delay
SIP/SCCP
SIP/SCCP
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-19
Clustering Over the IP WAN: Design Guidelines
40-ms maximum round-trip delay between any two Cisco Unified Communications Manager servers in the cluster
Minimum 1.544 Mb/s and 900 kb/s 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)
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-20
Clustering Over the IP WAN: Benefits
PSTN call cost savings when using the IP WAN for calls between sites.
Use of the IP WAN to bypass toll charges by routing calls through remote site gateways, closer to the PSTN number dialed, that is, TEHO.
Maximum utilization of available bandwidth by allowing voice traffic to share the IP WAN with other types of traffic.
Failover across WAN is supported.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-21
Cisco Unified Communications Manager Call-Processing Redundancy
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-22
Cisco Unified Communications Manager Redundancy
Maximum of eight call-processing servers in a cluster.
Redundancy is provided by Cisco Unified Communications Manager groups.
– Prioritized list of call-processing servers (one or more).
– Multiple Cisco Unified Communications Manager groups can exist in the same cluster.
– Each call-processing server can be assigned to more than one Cisco Unified Communications Manager group.
– Each device has a Cisco Unified Communications Manager group assigned determines the primary and backup server to which it will register.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-23
1:1 Redundancy Design High availability (upgrade) Increased server count Simplified configuration
Primary
Secondary orBackup
Publisher and TFTP Server (Not Req. <1000)
Publisher and TFTP Server
Publisher and TFTP Server
7500 IP phones 15,000 IP phones 30,000 IP phones
Primary 1 to 7500
Backup
Backups
1 to7500
1 to7500
15001 to22,500
7501 to15,000
7501 to15,000
22,501 to30,000
Cisco MCS 7845 Cisco MCS 7845 Cisco MCS 7845
Backups Backups
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-24
2:1 Redundancy Design
Cost-efficient redundancy Service impacted during upgrade
Primary
Secondary orBackup
Publisher and TFTP Server (Not Req. <1000)
Publisher and TFTP Server
Publisher and TFTP Server
7500 IP phones 15,000 IP phones 30,000 IP phones
Primary 1 to 7500
Backup
Backup
1 to7500
1 to7500
15,001 to22,500
7501 to15,000
7501 to15,000
22,501 to30,000
Cisco MCS 7845 Cisco MCS 7845 Cisco MCS 7845
Backup Backup
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-25
Summary
Supported Cisco Unified Communications Manager 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 Communications Manager, applications, and DSP resources are at the same physical location; all off-site calls are handled by the PSTN.
The multisite with centralized call-processing model has a single Cisco Unified Communications Manager cluster; applications and DSP resources can be centralized or distributed; the IP WAN carries call control signaling traffic even for calls within a remote site.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-26
Summary (Cont.)
The multisite with distributed call-processing model has multiple independent sites, each with a Cisco Unified Communications Manager cluster; the IP WAN carries traffic only for intersite calls.
Clustering over the WAN provides centralized administration, a unified dial plan, feature extension to all offices, and support for more remote phones during failover. But it also places strict delay and bandwidth requirements on the WAN.
Clusters provide redundancy. A 1:1 redundancy design offers thehighest availability but requires the most resources and is not as cost-effective as 1:2 redundancy.
© 2008 Cisco Systems, Inc. All rights reserved. CIPT1 v6.0—1-27
