TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
3
1. Introduction
1. Introduction
This guide describes procedures to validate and perform troubleshooting on a WLAN that
supports a VoWiFi system. It identifies some of the more common problem areas associated
with the operation of VoWiFi networks and suggests approaches to troubleshooting and the
use of internal and external tools for investigating these problems. The guide contains
detailed information about the behavior of the Ascom i62 VoWiFi Handset under faulty or
problematic conditions. This behavior may be different for different hardware and software
versions of the handset.
1.1 Target Group
This guide is written for support engineers responsible for troubleshooting customer site
Voice over Wireless Fidelity (VoWiFi) systems and the WLANs that support such systems.
The guide may also be of considerable use to system administrators and network planners
intending to design, implement, deploy and commission a new WLAN designed for VoWiFi
access or upgrade an existing WLAN to support a new VoWiFi system. To this latter group,
the importance of careful planning and provisioning through an exhaustive, rigorous and
detailed site survey cannot be over emphasized. Many of the problems described in this
guide arise because of poor provisioning and planning. In this respect, system
administrators and network planners are recommended to read the document System
Plan
ning, Ascom VoWiFi System.
1.2 Prerequisite
To gain the maximum benefit from this guide, readers should have experience in and
knowledge of the following areas:
• Configuring a factory delivered handset and performing a handset software upgrade.
• How WLAN networks function up to the l
evel of Certified Wireless Network
Administrator (CWNA) certification or similar level.
• Sufficient knowledge in netwo
rking concepts and an understanding of the TCP/IP
protocol suite.
• A basic understanding of Voice over Internet
Protocol (VoIP) and the VoIP Session
Initiation Protocol (SIP).
• Have read the configuration manual for the corresponding handset.
• Have read other documents related to the installa
tion, for example WLAN specification
and documents pertaining to the interoperability of the handset with the WLAN
infrastructure.
1.3 Material Needed
To assist in troubleshooting, it is recommended that the support engineer is able to have at
his or her disposal:
• The Portable Device Manager (PDM) ap
plication “WinPDM”. The support engineer should
be familiar with using the application for setting and modifying handset parameter
values. Many error symptoms are related to a inappropriate configuration parameters
values. Troubleshooting the PDM application itself is not covered in this guide.
• One or more handsets.
• A fixed phone, that is, a phone connected to the wired LAN.
• A tool that plays a continuous audio stream such as music, for
example a radio or an MP3
player.
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