Cisco IOS Telephony Services Survivable/Standby Remote Site Telephony

Transcription

1 DATA SHEET Cisco IOS Telephony Services Survivable/Standby Remote Site Telephony As enterprises extend their telephony and high-value application deployments from central sites out to remote offices, one of the factors considered vital in deployment is the ability to cost-effectively provide backup redundancy functions at the remote branch office. However, the size and number of these small-office sites precludes most enterprises from deploying dedicated call-processing servers, unified messaging servers, or multiple WAN links to each site to achieve the high availability required. The Cisco CallManager Telephony Solution combined with the newly released Survivable/Standby Remote Site Telephony (SRS Telephony) feature in the Cisco IOS software allows companies to extend high-availability telephony to their small branch offices with a cost-effective solution that is extremely simple to deploy, administer, and maintain. Key Features and Benefits telephony is currently undergoing explosive growth, driven by access to value-added features and applications only telephony can provide to the end user. Additionally, the cost benefits of running voice and data on a single network is fueling the rapid acceptance of this technology. An architecture in which a Cisco CallManager cluster and application servers, located at the central site, provide telephony services for all sites of a corporation has the following benefits. Centralized configuration and management Access at every site to all Cisco CallManager features such as next-generation call centers, unified messaging services, embedded directory services, mobility, and soft phones during normal operations IT staff not required at each remote site Cost-effective operations through converged voice and data network Remote maintenance and troubleshooting When remotely placing phones from a Cisco CallManager cluster, call-processing redundancy must be provided in case there is a WAN failure. This is especially critical when emergency calls, such as those to 911 in the United States, need to be placed during a WAN outage. Cisco has developed SRS Telephony technology for all Cisco IOS software platforms that support voice. Currently the Cisco 176x, 2600, 3600, 3700, and 7200 Series Multiservice Access Routers and the IAD2400 and Catalyst 4224 Access Gateway Switch support this capability, with additional platforms being added over time. SRS Telephony comprises network intelligence integrated into Cisco IOS Software. This service can act as the call-processing engine for phones located in the branch office during a WAN outage (Figure 1). All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 1 of 5

2 Figure 1 Centralized Cisco CallManager Deployment with WAN Failure Small Branch C oice Mail/ Unified Messaging PSTN WAN Small Branch D Headquarters Centrally located Cisco CallManager and unified messaging servers provide services for branch office locations During failure, telephony router providing call processing for phones Large Branch B All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 2 of 5

3 SRS Telephony is a capability embedded in Cisco IOS Software that runs on the local branch office access router. SRS Telephony automatically detects a failure in the network, and, using the Cisco Simple Network Automated Provisioning (SNAP) capability, initiates a process to intelligently autoconfigure the router to provide call-processing backup redundancy for the phones in that office. The router provides call processing for the duration of the failure, ensuring that the phone capabilities stay up and operational. Upon restoration of the WAN and connectivity to the network, the system automatically shifts call-processing functions to the primary Cisco CallManager cluster. Configuration for this capability is done once in the Cisco CallManager at the central site, simplifying deployment, administration, and maintenance. IT staff is not needed at the remote sites to enable and disable this functionality as a result of the intelligence and simplicity of the SRS Telephony feature. Table 1 Cisco IOS Software Release Information Platform Cisco 175x Cisco 1760 Cisco 2600 and 3600 Cisco 3700 Cisco IOS Images 12.2(4)Y Cisco (8)T ersion 1.0, 12.2(11)T ersion 2.0 Cisco IAD2400 Catalyst 4224 Access Gateway Switch 12.2(2)YC ersion 1.0, 12.2(11)T ersion 2.0 Catalyst 4000 Access Gateway Module TBD Phone Support From 24 to 480 phones are supported across the choice of SRS Telephony enabled platforms. Table 2 Phone Support per Platform Platform Number of Phones Supported Number of Lines Available Cisco 175x, 1760, 2600, 3620, IAD2400 Up to 24 phones 96 Cisco 2691, 3640, 3700, Catalyst 4224 Up to 48 phones 192 Cisco 3660 Up to 144 phones 288 Cisco 7200 Up to 480 phones 960 While 24 or 48 phones can be configured per system, multiple lines per phone are supported as a default, providing, for example, up to 24 phones and 96 lines on a Cisco 2650 and 48 phones and 192 lines on a Cisco Minimum System Requirements for SRS Telephony Note: Cisco recommends that, if possible, you add memory above the minimum requirements to the router so that future images with added features can still be supported without having to open up the router. All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 3 of 5

4 Table 3 Minimum System Requirements Platform Minimum Requirement Comment Cisco 175x Cisco 1760 Cisco 2600, 3620 and 3640 For Cisco 1750, 16 MB Flash, 48 MB DRAM For Cisco 1751, 16 MB Flash, 64 MB DRAM 16 MB Flash, 64 MB DRAM 16 MB Flash and 64 MB DRAM for Plus Cisco IOS Plus Image Cisco 1750 supports SRST on the / OX/Plus image only; Cisco 1751 supports SRST on all images containing /OX/Plus 32 MB Flash and 96 MB DRAM is required for Enterprise Plus Cisco MB Flash and 64 MB DRAM for up to 48 phones, 96 MB for up to 96 phones, and 128 MB for up to 144 phones on Plus Add 16 MB of Flash and 32 MB of SDRAM for the Enterprise Plus image Cisco MB Flash, 128 MB DRAM 64MB Flash recommended for the flexibility of holding multiple IOS images in Flash Cisco 7200 Cisco IAD2400 Catalyst 4224 Cisco CallManager Software Firmware images (loads) for phones NPE MB phones NPE MB phones NPE MB phones NPE MB phones Standard shipping configuration Standard shipping configuration 3.05 (Encore) or higher Standard CM 3.1 phone loads for SRS Telephony phase 2 features, Cisco 7940 and P003E302.bin Cisco P004E302.bin when working with CM 3.0s Cisco SRS Telephony provides robust support of a large set of phone features through the duration of the failure-functionality, which is not available from other traditional telephony solutions. Features supported during the failure are listed in Table 4. Table 4 Cisco SRS Telephone: Features in Second Release Rehoming of phones upon failure to branch router for call processing Maintain local extension to extension calls upon failure Maintain extension to PSTN calls upon failure Maintain existing calls upon recovery Support for and POTS phones Up to 6 lines per phone Up to 24 line appearances per system Primary line on phone DID and DOD calling Caller ID and ANI support Calling party name Distinctive ringing Call hold and pick PSTN-T1 and E1 CAS trunks support ISDN BR1 and PRI support Analog FXO/FXS Call-detail recording and Radius server Interworking with Cisco Gatekeeper WAN link support: FR, ATM, MLPP, Serial, AAL2, DSL Music and Tone on Hold, and on Transfer (MOH for endpoints PSTN only) Class of Restriction TCL-based simple AA and IR on local gateways All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 4 of 5

5 Speed and last number redial Translation Rules support Transfer across H323 network of Cisco endpoints Alias lists for unregistered phones Transfer to voic pilot number using PSTN Summary The SRS Telephony feature, when used with the entire line of Cisco CallManager Telephony Solutions, enables customers to deploy converged data, voice, and video applications throughout their entire corporation in a cost-effective manner with ease of deployment, administration, and maintenance, while providing high availability. Cisco Telephony capabilities bring value-added features to users desktops, enabling them to improve productivity and increase customer satisfaction. For more information on Cisco Telephony Solutions and SRS Telephony, visit: /warp/public/779/largeent/avvid/. Corporate Headquarters 170 West Tasman Drive San Jose, CA USA Tel: NETS (6387) Fax: European Headquarters Cisco Systems Europe 11, Rue Camille Desmoulins Issy-les-Moulineaux Cedex 9 France www-europe.cisco.com Tel: Fax: Americas Headquarters 170 West Tasman Drive San Jose, CA USA Tel: Fax: Asia Pacific Headquarters Cisco Systems Australia, Pty., Ltd Level 9, 80 Pacific Highway P.O. Box 469 North Sydney NSW 2060 Australia Tel: Fax: Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the Cisco Web site at /go/offices Argentina Australia Austria Belgium Brazil Bulgaria Canada Chile China PRC Colombia Costa Rica Croatia Czech Republic Denmark Dubai, UAE Finland France Germany Greece Hong Kong SAR Hungary India Indonesia Ireland Israel Italy Japan Korea Luxembourg Malaysia Mexico The Netherlands New Zealand Norway Peru Philippines Poland Portugal Puerto Rico Romania Russia Saudi Arabia Scotland Singapore Slovakia Slovenia South Africa Spain Sweden Switzerland Taiwan Thailand Turkey Ukraine United Kingdom United States enezuela ietnam Zimbabwe Copyright 2001, All rights reserved. Printed in the USA. and Cisco, Cisco IOS, Cisco Systems, and the Cisco Systems logo are registered trademarks of and/or its affiliates in the U.S. and certain other countries. All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0106R) /ETMG 10/01