1 Troubleshooting GuideAscom i62 VoWiFi Handset TD 92685EN28 June 2012 / Ver. A TD 92685EN28 June 2012 / Ver. ATroubleshooting GuideAscom i62 VoWiFi HandsetAbout this documentThis Guide describes how to investigate and remedy Quality of Service problems experienced by handset users when accessing a WLAN and making calls using the Voice over IP Protocol (VoIP). Cross-references in the documentThroughout this document you will find cross-references in the text which indicate further details that can be found in other sections of this document. The cross-references are colored blue and linked to the relevant place in the document. For example: see chapter 9.
2 Document History on page 61. Positioning your cursor over the cross-reference text and clicking the left mouse button will take you to the relevant section. To return to the original page after viewing a cross-referred page in Adobe Acrobat or Adobe Reader, click on the Previous View arrow ( or ).TD 92685EN28 June 2012 / Ver. ATroubleshooting GuideAscom i62 VoWiFi HandsetContents1. Target Material Software Abbreviations and Information Required by 52. WLAN The Problem of Legacy WLAN Planning and The Importance of Pre- and Post-Site WLAN Troubleshooting Implications and WLAN 83.
3 The VoWiFi Handset as a Wireless VoWiFi Handset Protocol Troubleshooting the Voice Transmission over a VoWiFi Handset Startup AP Active Passive Configured Channels and Scanning Power U-APSD PS Mode Recommended Screen Idle Call System-Aided DFS Channel SIP SIP Call Redirect Call Message 27TD 92685EN28 June 2012 / Ver. ATroubleshooting GuideAscom i62 VoWiFi Troubleshooting 284. Factors Affecting RF Jitter, Latency and Packet Signal Troubleshooting Isolate Problem 315.
4 The VoWiFi Handset as a Troubleshooting Handset Device Site Survey Show Creating Evaluate the Radio Range Coverage and Roaming The Admin Handset Web Logs Statistics Tools Quality of Service (QoS) 396. Troubleshooting Attended Transfer PBX Basic Call Identifying Name Presentation WLAN Troubleshooting Voice Problems while 477. VoWiFi Handset Problem Solving Handset Startup Errors Displayed on the No Messaging or Voice No Battery Power is Connected Call but No Sound or One-way U-APSD Determining if the AP Supports Determining if Handset Signals its use of 56TD 92685EN28 June 2012 / Ver.
5 ATroubleshooting GuideAscom i62 VoWiFi Packet Classification of U-APSD in the 568. Related 609. Document 61 Appendix A: Making Air Traces of 62 Appendix B: Handset 63 Appendix C: Digital 69 Appendix D: External Troubleshooting 71 Appendix E: Ascom i62 74 Index .. 77TD 92685EN28 June 2012 / Ver. ATroubleshooting GuideAscom i62 VoWiFi Handset31. 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.
6 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 GroupThis 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.
7 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 Planning, Ascom VoWiFi 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 level of Certified Wireless Network Administrator (CWNA) certification or similar level. Sufficient knowledge in networking 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).
8 Have read the configuration manual for the corresponding handset. Have read other documents related to the installation, for example WLAN specification and documents pertaining to the interoperability of the handset with the WLAN NeededTo assist in Troubleshooting , it is recommended that the support engineer is able to have at his or her disposal: The Portable Device Manager (PDM) application 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 .
9 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 92685EN28 June 2012 / Ver. ATroubleshooting GuideAscom i62 VoWiFi Handset41. Introduction An air trace tool or protocol analyzer such as Omnipeek or Wireshark for capturing traces on the LAN and WLAN. These require a WLAN adapter and network card respectively. A spectrum analyzer for detecting non RF VersionThis Guide refers to a handset running software version or later. and Glossary The following acronyms and terms are used throughout this Guide :APAccess User AgentBSSB asic Service Set.
10 BSSIDB asic Service Set Identifier. CACCall Admission ControlCCICo Channel InterferenceDFSD ynamic Frequency SelectionDHCPD ynamic Host Configuration Protocol. DNSD omain Name Services Code Point. QoS on the Internet Layer. Used both for WLANs and Traffic Indication Message. DTMFDual-Tone Multi-Frequency EDCAE nhanced Distributed Channel AccessESSE xtended Service Set. ESSIDE xtended Service Set IdentifierIEEEI nstitute of Electrical and Electronics Engineers IMS3 Integrated Message ServerITU-TInternational Telecommunication Union-TelecommunicationMACM edia Access CapturePDLP ortable Device Logger. A Troubleshooting Device Switched Telephone NetworkQoSQuality of for CommentsRPCAPR emote Packet CaptureRSSIR eceived Signal Strength Transport ProtocolSIPS ession Initiation ProtocolSNRS ignal-to-noise ratioTD 92685EN28 June 2012 / Ver.