Understanding the Voice Wireless Network

Chapter 1 An Overview of the Cisco Wireless IP Phone 7920

Voice over IP (VoIP) telephones use a hard-wired connection to the network for transmitting call control messages and voice packets. With the introduction of wireless communication, mobile wireless IP phones provide similar communication features within the corporate wireless local area network (WLAN). Use the following topics to understand your voice wireless network:

•Overview of a Wireless LAN, page 1-4

•The 802.11 Standard for Wireless LAN Communications, page 1-5

•Wireless Access Points, page 1-6

•Security, page 1-7

Overview of a Wireless LAN

In a traditional LAN, phones and computers use cables to transmit messages and data packets over a wire conductor. Wireless LANs use radio waves to carry the messages and data packets. WLANs require access points that receive and transmit radio signals. Cisco Aironet series access points including the 1200, 1100, and 350 series models support voice on a WLAN. Figure 1-2shows a typical WLAN topology that incorporates both wireless data with laptop computers and wireless IP telephony (WIPT) with Cisco Wireless IP Phone 7920.

When a wireless device powers on, it immediately searches for and becomes associated with an access point. As users move from one location to another within the corporate WLAN environment, the wireless device roams out of range of one access point and into the range of another. Data and voice calls are transmitted from the access point to the switch and router by using the wired, Ethernet network. Phone calls are sent to the Cisco CallManager server for call processing and routing.

	Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
1-4	OL-3930-02

7920 specifications

Cisco Systems, a leading player in the global networking and communications technology sector, designed the Cisco 7920 Wireless IP Phone for mobile professionals seeking seamless connectivity in various environments. Primarily aimed at enhancing communication within enterprise settings, this wireless device offers a plethora of features that cater to the specific needs of businesses.

At the core of the Cisco 7920 is its robust wireless functionality. It operates on IEEE 802.11b/g wireless protocols, allowing users to connect effortlessly to Wi-Fi networks. This flexibility enables employees to communicate effectively from various locations within an office space, promoting mobility and collaboration without being tethered to a desk.

The ergonomic design of the Cisco 7920 prioritizes user comfort. Its lightweight casing and intuitive button layout ensure that users can navigate the interface with ease. The device is equipped with a vibrant color display, allowing for clear visibility of caller ID, call status, and menu options, enhancing the user experience further. Additionally, the handset supports a wide variety of languages, making it suitable for global teams.

In terms of features, the Cisco 7920 is loaded with advanced capabilities. It supports voice over IP (VoIP), delivering high-quality audio and ensuring reliable communication. Users benefit from features like a contextual menu, call hold, transfer, conference calling, and voicemail access on the go. The phone also offers a wide range of ringtones, allowing customization to suit personal preferences or company branding.

Security is a crucial aspect of modern telecommunications, and the Cisco 7920 does not fall short. It incorporates industry-standard security protocols such as Wired Equivalent Privacy (WEP) and Wi-Fi Protected Access (WPA), safeguarding communications from potential threats.

Moreover, the Cisco 7920 integrates seamlessly with Cisco Unified Communications Manager, enabling centralized management and control. This integration ensures that IT departments can deploy, manage, and troubleshoot devices efficiently, streamlining operations while ensuring optimal performance.

In conclusion, the Cisco 7920 Wireless IP Phone stands out as a versatile communication tool designed for the fast-paced workplace. Its combination of wireless connectivity, ergonomic design, advanced features, and robust security makes it an essential accessory for businesses looking to elevate their communication strategies. With its established reputation, Cisco continues to support companies in achieving seamless connectivity and effective collaboration.