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Deployment Guide

Cisco Mobile 8.1 for iPhone Deployment Guide

What You Will Learn

You will learn how to enable your Apple iPhone to use Cisco

Mobile 8.1 within your wireless LAN and Cisco

Unified Communications Manager infrastructure. This document should help you avoid some common areas of

confusion, and will provide you with an overview of what to expect from the solution when properly deployed. This

document is not to be used as a substitute to existing product documentation, but is intended to be used as a

supplementary guide.

Introduction

The pervasive availability of wireless LANs (WLANs) and introduction of IP Telephony greatly improved

productivity in the enterprise. WLANs provide you with much better access to key network resources that can lead

to substantial productivity gains. Similarly, the IP Telephony evolution led by Cisco has changed the world of

communications. The Cisco Unified Communications platform allows businesses to communicate in ways never

before imagined and has created a momentous shift in the telephony market away from traditional PBX systems to

more flexible IP-based architectures. At the junction of these two trends are mobile devices, with the potential of

connecting to the enterprise over WLAN as well as cellular technologies, while integrating into your organization’s

unified communications infrastructure.

Many WLAN deployments as well as WLAN-enabled mobile devices have focused on data traffic such as email

and webpage access. Voice traffic is of a different nature from data traffic and is more sensitive to packet delay

and packet loss. Similarly, mobile workers behave in ways that computer users may not - they roam hallways while

using their devices, and they may wander into areas where wireless coverage previously was not required,

entering and leaving buildings at will, often while in the middle of a call.

Cisco has addressed all of these requirements by incorporating the latest advances in Quality of Service (QoS),

seamless fast roaming across Layer 2 and Layer 3 boundaries, centralized management, and support for a broad

range of security types into the Cisco Unified Wireless Network.

However, an additional challenge of deploying voice over WLAN (VoWLAN) on mobile devices centers around the

differences of protocol implementation on various mobile platforms. Many of these platforms were optimized for

data transmission, but are now used for VoWLAN communications. Although these device limitations cannot be

addressed, WLANs can be optimized to minimize the impact of differences of WLAN implementation between

various mobile devices.

VoWLAN deployments today must cover the needs of a variety of voice endpoints, including soft phones running

on desktops, designated VoWLAN phones such as the Cisco Unified Wireless IP Phone, and more recently, soft

phones running on a variety of mobile devices. Administrators need to design the WLAN in such a way as to

optimize performance of any of these devices, preferably by designing for the most capable device first, since

less-capable devices will ultimately benefit from such an optimized network. Two key design elements that must

be considered when designing a voice-ready WLAN are adequate call capacity and signal strength and coverage

for mobile wireless devices.