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Getting Started with Cisco Unified Communications Manager

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

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Getting Started with Cisco Unified Communications Manager

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  1. Understanding Cisco Unified Communications Manager Deployment and Redundancy Options Getting Started with Cisco Unified Communications Manager

  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

  3. Cisco Unified Communications Manager Deployment Options

  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 Unified CM Cluster Applications Unified CM Cluster Applications PSTN Branch IP WAN Headquarters

  5. Cisco Unified Communications Manager Single-Site Deployment

  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. Cisco Unified CM Cluster SIP/SCCP PSTN

  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.

  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

  9. Cisco Unified Communications Manager Multisite Deployment with Centralized Call Processing

  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. Cisco Unified CM Cluster SIP/SCCP IP WAN PSTN SIP/SCCP SIP/SCCP

  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.

  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.

  13. Cisco Unified Communications Manager Multisite Deployment with Distributed Call Processing

  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. Cisco Unified CM Cluster SIP/SCCP Gatekeeper GK IP WAN PSTN SIP/SCCP SIP/SCCP Cisco Unified CM Clusters

  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

  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.

  17. Cisco Unified Communications Manager Multisite Deployment with Clustering Over the WAN

  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 <40-ms Round-Trip Delay IP WAN QoS Enabled BW SIP/SCCP SIP/SCCP

  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)

  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.

  21. Cisco Unified Communications Manager Call-Processing Redundancy

  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.

  23. 1:1 Redundancy Design • High availability (upgrade) • Increased server count • Simplified configuration Primary Secondary or Backup 7500 IP phones 30,000 IP phones 15,000 IP phones Cisco MCS 7845 Cisco MCS 7845 Cisco MCS 7845 Publisher and TFTP Server (Not Req. <1000) Publisher and TFTP Server Publisher and TFTP Server 1 to 7500 1 to 7500 Backups Backups Primary 1 to 7500 Backup 7501 to 15,000 7501 to 15,000 15001 to 22,500 Backups 22,501 to 30,000

  24. 2:1 Redundancy Design Primary • Cost-efficient redundancy • Service impacted during upgrade Secondary or Backup 7500 IP phones 30,000 IP phones 15,000 IP phones Cisco MCS 7845 Cisco MCS 7845 Cisco MCS 7845 Publisher and TFTP Server (Not Req. <1000) Publisher and TFTP Server Publisher and TFTP Server 1 to 7500 1 to 7500 Backup Backup Primary 1 to 7500 Backup 7501 to 15,000 7501 to 15,000 15,001 to 22,500 Backup 22,501 to 30,000

  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.

  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.

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