Troubleshooting VoLTE

As a service, VoLTE has a lot of moving parts; between LTE, PCC and IMS operation, there’s a number of places in the network that can be the cause of service issues and outages. Using your VoLTE service assurance tools, this course will explain the common KPIs and failure scenarios that are encountered in the network, from registration through to call establishment. In addition, managing voice call quality will also be explored through analysis of RTP voice streams.
Course Introduction

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This course is available in the following delivery option(s)

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TRAINING ON LOCATION
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Section 1 - Principles of Network Performance Monitoring
Section 2 - Troubleshooting VoLTE Registration
Section 3 - Troubleshooting VoLTE Sessions
Section 4 - Troubleshooting VoLTE RTP Issues
Section 5 - Troubleshooting VoLTE Nodes

Topic areas covered include:

  • 3GPP Counters and KPI Definitions.
  • KPI Hierarchy.
  • Performance Monitoring Reports.
  • Example Reports.
  • Activity: Identifying Key VoLTE/IMS KPIs used for Troubleshooting.

Topic areas covered include:

  • VoLTE Registration KPIs:
    • SIP and Diameter KPIs.
  • Registration Failures.
  • SIP Timers.
  • SIP Error Codes.
  • Reason Headers/Reason Phases.
  • Activity: VoLTE Related Registration KPIs, Troubleshooting Registration Issues, Investigating Current Network Issues.

Topic areas covered include:

  • Why do VoLTE Calls Drop?
  • Session Success/Failures/Timeout.
  • Key Session VoLTE KPIs:
    • SEER, SCR, ACQ, Drops.
  • Session Establishment Failures:
    • Server Error.
    • Service Unavailable.
    • PCC Issues.
    • Forbidden.
    • Address Issues.
  • Troubleshooting VoLTE Session Issues.
  • Video KPIs.
  • VoWi-Fi Related KPIs.
  • Activity: VoLTE Session KPIs, Troubleshooting Session Issues, Investigating Current Network Issues.

Topic areas covered include:

  • Defining RTP/RTCP for AMR and WB-AMR.
  • One way media and Gap Detection.
  • RTP based KPIs.
  • Troubleshooting RTP Issues:
    • RAN Related Issues.
    • Detecting Audio Clipping.
  • Monitoring Transcoding.
  • Activity: RTP KPIs, Troubleshooting RTP Issues, Investigating Current Network Issues.

Topic areas covered include:

  • Monitoring VoLTE Nodes.
  • Interfaces and Node Performance.
  • Packet Loss on a Node.
  • Activity: Monitoring a VoLTE Node and Interface Performance.

The Institute of Telecommunications Professionals (ITP)

The ITP is the UK’s leading independent institution for people who work in telecommunications. It is dedicated to promoting the professional development of members through Professional Registration, training, mentoring and qualifications. The ITP collaborates with regulators, government associations and other leading bodies on projects that are important to the future of the industry. It has worked with businesses including; BT, Cable & Wireless Worldwide, Alcatel-Lucent, Huawei and Vodafone.  Find out more about The ITP and how you can become a member.

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