VoLTE Implementation Guide

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VoLTE Implementation Guide July 2020 GSM Association VoLTE Implementation Guide Page 2 of 21 VoLTE Implementation Guide 1 Introduction 3 Overview 3 Scope 3 References 4 2 Business Drivers 4 Business drivers of VoLTE on Home Network 4 Business Drivers for VoLTE Roaming 5 Customer Experience 5 Coverage 5 Possible Business Case Justifications (quick bullet points) 6 3 Selecting Roaming Partners - Handsets, Coverage, and Capacity Bands 7 Frequencies 7 Handsets 8 Device based Steering of Roaming 9 4 Billing Issues 9 Comparison of QCI-based charging and APN-based charging 9 Signalling 10 Retail Presentation 10 Billing from Home Network Elements 10 Time Zones 10 5 Technical Issues Important to Roaming Managers 11 Enable / Disable IMS-APN 11 IMS Registration 11 QCI Settings 12 GBR Configurations 12 Lawful Intercept 12 Single Radio Voice Call Continuity (SRVCC) 13 Fraud Systems 13 Emergency Calling 13 eCall 14 Local Number Translation & Routing 14 Determination of Location / Time-Zone (TZ) 15 IPv4/IPv6 Compatibility Issues 15 WPS (Wireless Priority Service)

[1] 3GPP TS 23.167 IP Multimedia Subsystem (IMS) emergency sessions [2] IETF RFC 8147 Next-Generation Pan-European eCall [3] 3GPP TS 34.229 User Equipment (UE) conformance specification [4] 3GPP TS 36.101 Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception

  3gpp, 3gpp ts 23, 3gpp ts