Introduction, Prerequisites, Requirements

Wireless IPT Design Guide for the Cisco 7920 IP Phone

Introduction

Prerequisites

Requirements

Components Used

Conventions

Cisco 7920 IP Phone Overview

WLAN Overview

RF Overview Site Surveys and Design Recommendations

VoIP QoS

Security for the Cisco 7920 and WLAN Networks

Network Sizing

Number of 802.11b Devices per AP

Number of 802.11b IP Phones per AP

Numbers of 802.11b Phones per Layer 2 Subnet or VLAN

Understanding Layer 2 and Layer 3 Roaming

Understanding Roaming Terminology

Layer 2 Roaming

Layer 3 Roaming

VLANs

WLAN QoS for VoIP

Interconnecting WLANs to Cisco Campus Infrastructure

Connecting APs to the Catalyst 3550 SMI or EMI

Connecting APs to the Catalyst 2950 EI

Connecting APs to the Catalyst 2950 SI

Using Cisco Emergency Responder for E911 calls with the Cisco 7920

Caveats and Limitations

Call Admission Control

Designing Around the Lack of Layer 3 Roaming

Other Caveats and Limitations

Related Information

Introduction

This document provides design guidelines and deployment recommendations for customers adding the Cisco 7920 IP Phone to an existing Architecture for Voice, Video and Integrated Data (AVVID) network. The assumption is made that you have either an existing AVVID network for wired IP phones, or that you have previously read the AVVID design guides. It is not assumed that you have previous Wireless LAN (WLAN) experience. This document makes reference to several existing design guides for 802.11, IP Telephony, and campus network design.

Prerequisites

Requirements

Readers of this document should be knowledgeable of the following:

Cisco − Wireless IPT Design Guide for the Cisco 7920 IP Phone

7920 IP specifications

The Cisco Systems 7920 IP phone represents a significant advancement in wireless communication technology, designed specifically for enterprises that require mobility and efficiency in their communication systems. This versatile device integrates seamlessly into a Cisco IP telephony network, allowing users to maintain connectivity while on the move, which is essential in fast-paced business environments.

One of the key features of the Cisco 7920 is its robust wireless capabilities. Operating on the IEEE 802.11b/g Wi-Fi standards, it provides a reliable connection to corporate networks, ensuring that users can access voice, data, and video services without being tethered to a desk. The phone supports dynamic call handling and features a responsive LCD display that enhances user interaction, making it easier to navigate menus and manage calls.

The Cisco 7920 also offers exceptional sound quality, thanks to its advanced audio technology. With Wideband audio support, users can experience clarity in conversations, which is particularly important in environments where clear communication is vital. The phone is equipped with noise-canceling capabilities that reduce background noise, allowing users to focus on their conversations without distractions.

Security is another critical aspect of the Cisco 7920. The device supports several security protocols, including WPA and WPA2, ensuring that all communications are encrypted and secure. This is crucial for organizations that handle sensitive information and need to comply with industry regulations.

Additionally, the Cisco 7920 features an extended battery life, enabling users to make calls throughout the day without frequent recharging. Its lightweight design and ergonomic build make it comfortable to use for extended periods.

In terms of integration, the Cisco 7920 IP phone is compatible with various Cisco Unified Communications Manager software versions, allowing for easy configuration and management within existing network infrastructures. Its support for multiple languages also makes it a suitable choice for international organizations, accommodating diverse user groups.

Overall, the Cisco Systems 7920 IP phone combines the necessary features, technologies, and characteristics to meet the demands of modern enterprise communication. Its blend of wireless capability, superior audio quality, security measures, and integration versatility makes it an excellent choice for organizations seeking efficient and reliable communication solutions.