TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
Contents
1. Introduction ................................................................................................................... 3
1.1 Target Group
........................................................................................................... 3
1.2 Prerequisite
............................................................................................................. 3
1.3 Material Needed
...................................................................................................... 3
1.4 Software Version
..................................................................................................... 4
1.5 Abbreviations and Glossary
.................................................................................... 4
1.6 Information Required by TAC
.................................................................................. 5
2. WLAN Overview
............................................................................................................. 6
2.1 The Problem of Legacy WLANs
............................................................................... 6
2.2 WLAN Planning and Provisioning
............................................................................ 7
2.3 The Importance of Pre- and Post-Site Surveys
....................................................... 8
2.4 WLAN Dynamics
...................................................................................................... 8
2.5 Troubleshooting Implicat
ions and WLAN Design.................................................... 8
3. The VoWiFi Handset as a Wireless Client
.................................................................. 10
3.1 VoWiFi Handset Protocol Layers
........................................................................... 10
3.1.1 Troubleshooting the Layers
.......................................................................... 12
3.2 Voice Transmission over a VoWiFi System
............................................................ 12
3.3 Handset Startup Procedure
................................................................................... 12
3.4 AP Scanning
........................................................................................................... 13
3.4.1 Active Scanning
............................................................................................ 13
3.4.2 Passive Scanning
.......................................................................................... 13
3.4.3 Configured Channels
and Scanning Intervals ............................................... 13
3.5 Power Management
.............................................................................................. 14
3.5.1 Overview
....................................................................................................... 14
3.5.2 U-APSD PS Mode Operation
.......................................................................... 15
3.5.3 Recommended Values
.................................................................................. 17
3.5.4 Screen Saver
................................................................................................. 17
3.6 Roaming
................................................................................................................ 17
3.6.1 Idle Mode
...................................................................................................... 18
3.6.2 Call Mode
....................................................................................................... 18
3.6.3 System-Aided Roaming
................................................................................ 19
3.7 DFS Channel Probing
............................................................................................. 19
3.8 SIP
.......................................................................................................................... 20
3.8.1 SIP Components
............................................................................................ 21
3.8.2 SIP Call Setup
................................................................................................ 23
3.8.3 Redirect Servers
............................................................................................ 26
3.8.4 Call Completion
............................................................................................. 26
3.8.5 Message Content
.......................................................................................... 27
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