Unified Communications 500 Series supports the deployment models shown in Table 2.
Table 2 Cisco Unified Communications 500 Series for Small Business Deployment Models
Single-Site Unified Communications System with Teleworker Set Up
The single-site model is designed for small businesses and supports up to 48 users located in main office, home office and mobile worker.
Figure 2-3 shows an example of this model.
Figure 1 Single-Site Model - Cisco Unified Communications 500 Series

Organization Suitability
The single-site model is suitable for small business operations that reside at one site and that need basic call processing and basic messaging and conferencing.
Design Characteristics
The single-site model is designed to be locally managed and administered. It can operate on a wired or wireless LAN. Local and long distance calling is achieved through gateway connectivity with the PSTN by various combinations of T1/E1 BRI.
User Roles and Endpoints
The single-site model provides flexible communications features for operators and administrative assistants. There are some executive phones, some of which are video-capable. Most other employees use digital telephones, including wireless telephones, and a voice messaging system, which this model also provides.
Some users may require mobile phones. This model provides on-campus device mobility features for these users. It also supports remote home office and remote mobile users.
Supported Applications
The single-site model supports applications that provide a wide array of advanced features. These applications include:
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Call Control
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Cisco Unified Communications Manager Express
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Cisco Unified Communications 500 Series for Small Business (designed specifically for business with under 50 users)
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Voice Mail and Messaging
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Cisco Unity Express
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Wireless and Mobility
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Cisco 500 Series Wireless Express Access Point and Controller
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Network Management
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Cisco netManager Unified Communications
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Infrastructure
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Catalyst Express 500 Series Switches
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Cisco 871W ISR