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VoNR Training | Voice over 5G Standalone


According to analysts, voice over New Radio (VoNR) should be considered a prerequisite for successful standalone (SA) 5G deployment operation.

VoNR is the general term given to IMS based voice services which use 5G as the access network (as opposed to LTE and VoLTE).

Standalone 5G connects the 5G Radio directly to the 5G core network, and the control signaling does not depend on the 4G network at all. Carriers in the U.S. began rolling out SA 5G earlier this year.

VoNR is expected to make possible many 5G SA-enabled data services like video conferencing or augmented and virtual reality features. It’s generally believed in the wireless communications industry that high quality and seamless voice calling is a must-have service for customers in the 5G era.

While 5G is driven by the ever-increasing need for higher data speeds, VoNR is also important for support of new 5G specific use cases and CS legacy phase-out.

The feeling is also that the addition of 5G VoNR can be a differentiator for next generation immersive applications that integrate high speed 5G data with high-definition audio.

Analysts estimate that the number of worldwide 5G voice over subscriptions (Voice over New Radio) will increase by 1.2 billion in 2025 compared to 2020.

Given these projections, it would seem prudent for operators to offer an increasing amount of voice services.

This is where a thorough understanding of Voice over New Radio (VoNR) is important. VoNR describes the routing and connection control of EVS encoded speech packets over IP protocol using the 5G NR radio interface and the 5GC core network.

A major objective of VoNR is the provisioning of voice services in a standalone operation of 5G, but not restricted to 5G SA only. One advantage with VoNR is the ability to use the sophisticated QoS support offered by the 5G protocol layers for the applications “voice and video.

3GPP, IMS specification is a standards-based architectural framework for delivering multimedia communications services.

Experts in this area believe the advantage of integrating IMS into the deployment scenario is that IMS manages (like in VoLTE) the Protocol Data Unit (PDU) session establishment with the relevant QoS flow for optimized voice quality.

Most feel this IMS architecture will play an increasingly important role in 5G VoNR. While IMS can provide voice services for any type of access as well as for any 5G-deployment model, 5G is not as flexible and absolutely has to have an IMS network to handle voice services no matter the type of deployment.

Carriers insist that high quality and seamless voice calling remains a must-have service for their customers in the 5G era. The addition of 5G VoNR can be a differentiator for next generation immersive applications that integrate high speed 5G data with high-definition audio.



VoNR Training | Voice over 5G Standalone Course by Tonex

While 5G launches in 2019 have been based on non-standalone architecture, 2020 is set to see standalone (SA) 5G and VoNR become a reality.

Voice over NR (VoNR) training is an innovative bootcamp style course that covers VoNR basic concepts, VoNR architecture, VoNR network nodes, VoNR protocols, VoNR interfaces, session handling, media and control, VoNR frameworks and profiles, VoNR operational scenarios, QoS, security, emergency services, SMS, charging and roaming.

Our VoNR Training course covers all aspects of  VoNR, the next innovation in the 5G Standalone (SA) deployment, 5GC in conjunction with IP Multimedia Subsystem (IMS) and SIP to deliver various services such as voice, SMS, video and other services such as IM and Presence. Voice over NR includes EPS fallback. EPS fallback is an additional mobility trigger for improving voice KPIs and related services. EPS Fallback enables smartphones and tablets to use the 5GC with NR, but RAN may trigger moving the mobile device to LTE/EPC during call establishment.

Mobile service providers will use a combination of VoLTE and VoNR complimented with VoWiFi to support 5G voice and other real time application services. VoNR networks based on IMS/SIP for call control needs to support 5G NR and 5GC architecture requirements, operational procedures, call establishment, QoS, security, interworking and roaming services.

This course describes the end-to-end 5G network (5GC, NG-RAN and IMS) and related operations for implementation of Voice over New Radio (VoNR). It provides key features and functionalities for the VoNR service including descriptions of the signaling procedures for IMS registration, Call Setup and release. The course also provides the description and signaling required for EPS fallback to VoLTE and procedures for emergency calling in 5G. The architecture for these services is described together with call flows showing the relationships between network functions in the 5G and 4G RAN and core systems and the IMS and PCC networks. The course will provide hands on exercises for students using log files if available.

Voice over NR (VoNR) provides the standardization for voice and real time solution deployed over 5G SA networks. Attend this course and learn more details about Voice over NR (VoNR). Learn about VoNR Call Establishment with 5GC/IMS and SIP, Key Technical Requirements for VoNR, QCI Values for Benares, Common RTP Payload Types, and RTCP Packet Types and more.

Voice over NR (VoNR) and Standalone New Radio (SA NR), 5G-enabled devices such as smartphones and tablets, do not need to rely on 4G/LTE technology (5G VoLTE or 5GS Fallback to E-UTRA) to make 5G voice (VoNR) calls. With standalone NR access, voice and other communication services will need to be provided, requiring the 5G network to support native voice calling, VoNR, services for 5G smartphones.

Using VoNR, 5G VoNR (Voice over New Radio) on SA architecture, consumers, business users and enterprises are able to use voice services using 5G-voice-capable devices as well as enhanced mobile broadband (eMBB) services including mmWaves.

Example of Topics covered:

  • VoTE Functionalists and Features
  • 5G SA Voice Solution Alternatives
  • EPS Fallback and Voice over IMS
  • Traditional Circuit Switched FallBack (CSFB)
  • VoNR Functionalities
  • VoNR Protocols
  • VoNR Network Configuration with IMS
  • Overview of Changes in 5GC to support Voice and SMS
  • IP Multimedia Subsystem (IMS)
  • IMS Architecture, Interfaces and Protocols
  • IMS Operational Scenarios for VoNR
  • Key Technical Requirements for VoNR
  • IMS Profile for Voice and SMS
  • IMS Signaling
  • 5GC Architecture for Voice and Messaging Support
  • Key Technical Requirements for VoNR
  • Transmission Time Interval (TTI) Bundling
  • Discontinuous Reception (DRX) 3GPP
  • Robust Header Compression (RoHC)
  • VoNR Functionalists and Features
  • VoNR End to End Signaling
  • 5GC Architecture for Voice and Messaging Support
  • VoNR Radio Performance
  • Rich Communication Suite (RCS)
  • 5G VoNR IMS Profile for Voice and SMS
  • 5G VoNR IMS Profile for Conversational Video
  • VoNR Interworking, Interconnection and Roaming
  • VoNR Security

Who Should Attend?

Engineers and Non-Engineers, analysts, project managers and anyone else interested in Voice over NR concepts, VoNR architecture, framework, protocols, technologies, standards, security, profiles and deployments.

Learning Objectives

Upon completing of this course, the student will:

  • Learn the key concepts behind architecture for voice services in 5G NSA and SA
  • Describe VoNR vs. EPS fallback services
  • LTE, LTE-A, 5G NR IMS, MMTel and VoLTE and VoNR
  • Describe 5G VoNR architecture
  • Discuss similarities and differences between Circuit-Switched Fallback (CSFB), Single Radio Voice Call Continuity (SRVCC), EPS voice services, Voice over IMS and Voice over NR
  • Discuss IMS Profile and codec types for Voice defined for 5G NR
  • Learn about IMS feature set, IMS media, radio and packet core features, and common VoNR functionalities
  • Discuss 5G NR architecture and signaling flow for VoNR calls in 5G
  • Explore IMS network architecture, services, elements, protocols to support voice, SMS and video
  • Identify the role of key network nodes, interfaces, protocols, media control and related protocols
  • Discuss PCC, QoS and security supporting VoNR
  • Discuss 5G NR registration procedures
  • Learn about VoNR profile and role of AS, RCS, MMTel, and ICS
  • Learn about call flows, SMS, roaming, charging, QoS and security and signaling procedures for EPS fallback vs. 5G NR
  • Discuss VoNR call flows and establishment
  • Discuss SMF, UPF, AMF, AUSF, UDM, PCF, IMS interactions and SIP/SDP message details
  • Discuss detailed VoNR security mechanisms

Course Outline

Overview of Voice Services in Evolved 5G and 5G NR

  • Voice evolution with 4G VoLTE
  • 4G VoLTE, LTE RAN and Packet Core
  • Capabilities to support telephony characteristics and emergency service
  • 5G System (5GS) consisting of 5G Core with NG-RAN
  • Existing 4G VoLTE deployment
  • Voice in EN-DC
  • 5G capabilities with NR non standalone to the LTE radio network
  • 5G NR coverage with overlapping LTE coverage
  • Wide-area LTE coverage supporting VoLTE
  • LTE and/or CS handles emergency services
  • VoLTE network with an underlying 2G/3G network
  • Single radio voice call continuity (SRVCC)
  • Fallback for voice
  • Many RAN features are needed to meet service Key
  • Performance Indicators (KPIs) and coverage for VoLTE and 5G VoNR
  • 4G PGW for voice services in the combined EPS and 5GS
  • SMF and UPF supporting S5
  • Interworking with N26 between MME and AMF in 5GC
  • Context transfer and network-controlled handover between EPC and 5GC
  • Combined HSS/UDM network functions and PCF with Rx
  • 5G Core supports new use cases including
  • Network slicing and edge computing

Introduction to Voice over NR (VoNR)

  • What is VoNR?
  • Overview of voice services in 5G
  • EPC, 5GC and IMS network architecture supporting voice and related services
  • VoNR vs. VoLTE
  • EPS Fallback signaling
  • VoNR Call Services
  • Codecs in VoNR for voice and video
  • VoNR and IP Multimedia Subsystem (IMS)
  • IMS Registration in 5G VoNR
  • VoNR call setup and call release
  • SIP signaling
  • QoS flow to EPS bearer mapping
  • QoS flow setup for voice and video
  • SMS services in VoNR
  • Emergency calls in VoNR
  • EPS fallback and emergency call using
  • 5G VoNR and IMS emergency calling

VoNR (Voice over NR) Architecture and Features

  • Key 5G NSA/SA and VoNR Concepts
  • Non-standalone and Standalone
  • Paths to 5G Voice over NR (VoNR)
  • VoNR end to end architecture
  • 5G NR access network
  • 5GC, MEC and network slicing
  • 5G Network nodes and roles
  • Key 5G NR interfaces
  • Key VoNR features and services
  • Policy and charging control

VoNR Functionalists and Features

  • VoNR operational procedures
  • IMS connectivity and procedures
  • VoNR call procedures
  • VoNR media codecs
  • SIP signaling
  • Call setup and teardown
  • Establishing QoS flows
  • Interworking with EPS and legacy voice networks
  • Integration with VoWiFi
  • Radio functionalists and bearers
  • UE capabilities for VoNR

Key Technical Requirements for VoNR

  • QCI Values for the Bearers
  • Mandatory SIP Headers
  • Getting Connected
  • Call and Media Handling
  • Handover from EPS to Circuit-Switched
  • Mobile Originating and Terminating
  • IMS control and media
  • IP flow and bearer management
  • 5G NR radio capabilities
  • Multi-media Telephony (MMTel) Supplementary Services
  • A range of Codes used in IMS and Mobile networks
  • Service Centralization and Continuity Application Server (SCC AS)
  • VoNR Signaling protocols
  • VoNR Call Scenarios
  • Bearer Concept & QoS-Architecture
  • Dedicated EPS Bearer Establishment
  • IMS triggered during Call Establishment
  • Requirements of protecting  VoNR traffic

VoNR Call Flows

  • VoNR Call Flow – Basic IMS Registration
  • VoNR/IMS Procedures PDN Connectivity (NAS Signaling)
  • Authentication
  • Bearer Setup and EPS Attach
  • Multiple Bearers (Default, Dedicated)
  • QoS Class Identifiers (QCIs)
  • GBR and Non-GBR
  • Standardized QCIs for 5G NR
  • P-CSCF Discovery
  • SIP Registration
  • Event Subscription
  • VoNR Call Flow
  • SMS over LTE/EPC/IMS
  • VoNR Security
  • VoNR Protection vs.  Latency
  • Protecting VoNR services against malicious attacks
  • VoNR Service Disruption Scenarios and Mitigation
  • Network Failures

VoNR End to End Signaling

  • Overview of SIP and SDP
  • Overview of RTP and RTCP
  • VoNR Call
  • IMS VoNR Procedures
  • PDN Connectivity
  • NAS Signaling
  • Signaling Bearer, DCCH and Attach Request
  • UE Authentication
  • Bearer Setup and EPS Attach
  • EPS Session Management (ESM)
  • UE P-CSCF Discovery
  • SIP Registration
  • Overview of AKAv2-MD5
  • Event Subscription
  • VoNR Subscription and Device Configuration
  • EPS Attach for CSFB
  • IMS VoIP and Default Bearer Activation
  • IMS Registration
  • Constructing the REGISTER Request
  • UE to the P-CSCF, P-CSCF to the I-CSCF and I-CSCF to the S-CSCF
  • S-CSCF Challenges the UE
  • UE’s Response to the Challenge
  • Registration at the S-CSCF
  • Third-Party Registration to Application Servers
  • Subscription to Registration Event Package
  • Re-Registration and Re-Authentication
  • De-Registration
  • SIP Headers and Codes
  • Quick Overview of AMR and AMR-WB

VoNR Voice Solution Alternatives

  • VoNR network configuration with IMS
  • VoNR system architecture
  • Overview of CSFB, SRVCC and voice over IMS
  • Circuit Switched FallBack (CSFB)
  • IMS Profile for Voice and SMS
  • UE and Network Protocol Stacks in IMS Profile for Voice
  • Supplementary Service Supported in VoNR
  • AMR codec and AMR-WB codec
  • 5G NR Features Reference
  • Semi-Persistent Scheduling 3GPP 36.321
  • Transmission Time Interval (TTI) Bundling 3GPP 36.321
  • Discontinuous Reception (DRX) 3GPP 43.013
  • Robust Header Compression (RoHC) IETF RFC4815

SMS in 5GS

  • SMS over the 5G access
  • SMS over IP (SMSoIP) using IMS
  • SMS over 5G NAS (SMSoNAS)
  • SMS transport between UE and AMF via NAS
  • SMSF in 5GS for handling originating and terminating SMS
  • MAP (or Diameter) for SMS transport with SMS-C
  • SMSoIP and IP-SM-GW for originating and terminating SMS
  • IP-SM-GW MT domain selection to other accesses (4G, 3G, 2G)
  • SMS transport between UE and IP-SM-GW is via IP
  • SMS over NAS and SMS over IP and 5GS UE supporting voice
  • SMS over NAS, SMS over IP or both
  • SMS solutions and EPS Fallback for voice
  • Other 5G  voice and related services (e.g. conversational video)

5G NR Emergency Cal Services

  • 5G NR Emergency call in LTE/E-UTRAN New Radio
  • Emergency call with Dual Connectivity (EN-DC)
  • EPS fallback
  • Emergency call over LTE connected to EPC
  • Role of IMS, PSAP, EN-DC
  • Emergency call service flows 5GS with NR Standalone (SA)

Optional Modules

5GC Architecture for Voice and Messaging Support

  • Applied IMS Feature Set
  • Support of generic IMS functions
  • SIP Registration Procedures
  • IMS Media
  • Bearer Management
  • Common Functionalists
  • Policy and charging control architecture
  • Complementing IMS with CS
  • IMS and PCF
  • Registration
  • Call establishment
  • E911/emergency calls
  • IMS Emergency Session
  • PDN Connection Setup for Emergency Session
  • Emergency Registration
  • Emergency Session
  • Mobility and VoNR
  • Roaming and IPX
  • Handovers
  • Interworking solutions with 3G and WiFi
  • VoNR Messaging
  • Native IMS Messaging
  • SMS Interworking
  • Multimedia Messaging Service
  • Unstructured Supplementary Services Data Simulation in IMS
  • Tonex IMS / VoNR Roadmaps, VoNR Call Traces and Reference Guide

5G VoNR Evolution Steps

  • 5G deployments using
  • 5G EPS NR Non-Standalone (NSA) in the RAN
  • 4G voice (VoLTE) and other IMS services
  • IMS and updated RAN
  • 4G VoLTE principles in 5G VoNR
  • 5G system (5GS) and NR standalone in the RAN
  • 5GS coupling to existing 4G VoLTE deployments
  • NG-RAN voice related capabilities
  • Voice over NR with EPS Fallback
  • UE fallbacks from NG-RAN to LTE during call establishment
  • 5G NR and EPS Fallback scenarios
  • 5G NR coverage connected to a 5G Core
  • Wide-area LTE coverage controlled by EPC supporting VoLTE
  • Emergency services
  • EPS fallback at call setup
  • Establishment of the Quality-of-Service (QoS) flow for voice media in 5G NR
  • NG-RAN voice capacity planning and dimensioning for voice
  • Voice over NR with IRAT handover
  • Voice over NR without relying on interworking with EPC/LTE

Example of 5G NR Built Out

  • Voice in EN-DC in urban area
  • Voice with EPS fallback in urban area
  • Voice in EN-DC in suburban area
  • Voice over NR in urban area
  • Voice over NR including EPS Fallback in suburban area
  • Voice over NR including EPS Fallback in rural area

Introduction to IP Multimedia Subsystem (IMS)

  • What is IMS?
  • Service creation and delivery
  • IMS elements
  • IMS Protocols and Messages
  • SIP protocol for session control
  • Service elements and functions
  • IMS resource and media control elements
  • Signaling and transport interworking elements
  • Session Control in the IMS
  • Media Encoding
  • Media Transport
  • SIP and Diameter in the IMS
  • Interfaces and Protocols
  • SIP extensions for IMS

IMS Architecture, Interfaces and Protocols

  • CSCF (Call Session Control Function)
  • S-CSCF (Serving-CSCF)
  • I-CSCF (Interrogating-CSCF)
  • P-CSCF (Proxy-CSCF)
  • HSS (Home Subscriber Server)
  • SLF (Subscription Locator Function)
  • Policy Decision Function (PDF)
  • AS (Application Server)
  • MGCF (Media Gateway Control Function)
  • MGW (Media Gateway)
  • BGCF (Breakout Gateway Control Function)
  • IP Multimedia Service Switching Function (IM-SSF)
  • Media Resource Function Controller (MRFC)
  • Media Resource Function Processor (MRFP)
  • SCIM, OSA-SCS, IM-SSF Addressing
  • Service oriented Interconnection (SoIx)
  • Connectivity oriented Interconnection (CoIx)
  • Interconnection Border Control Function (IBCF)
  • IMS-ALG (IMS Application Layer Gateway)
  • Media Resource Broker (MRB)
  • TrGW (Translation Gateway)
  • IMS Security Registration
  • Call origination and termination
  • Roaming and Handovers
  • Supplementary Services
  • Session renegotiation
  • External Services (VHE, OSA)
  • IMS Security Architecture
  • IMS Session Establishment
  • Interworking
  • Charging, Policy & QoS

IMS Operational Scenarios for VoNR

  • IMS IDs
  • IMS Public User Identity
  • IMS Private User Identity
  • Identification of User’s Device
  • Identification of Network Entities
  • Identification of Services (Public Service Identities)
  • IMS Private User Identity (IMPI)
  • IMS Public User Identity (IMPU)
  • VoNR UE Registration
  • Subscription requirements
  • Supplementary services
  • Call Set-up
  • PSTN Break-out
  • Services in IMS Registration
  • Call origination and termination
  • Charging implications
  • Roaming and handovers
  • Quality of service
  • Media Resource Reservation and Policy Control
  • IMS Security
  • Privacy implications
  • Authentication

GSMA IMS Profile for Voice and SMS

  • IMS Feature Set
  • Support of generic IMS functions
  • Supplementary Services
  • SMS over IPv4/IPv6
  • IMS Media
  • Voice Media
  • Radio and Packet Core Feature Set
  • Emergency Service
  • Roaming Considerations

GSMA IMS Profile for Conversational Video

  • IMS Feature Set
  • Support of Generic IMS Functions
  • SIP Registration Procedures
  • Call Establishment and Termination
  • Early Media
  • Supplementary Services
  • IMS Media
  • RTP Payload Format Considerations for
  • Radio and Packet Core Feature Set for Video
  • Bearer Considerations for Video
  • LTE Radio Capabilities

VoNR Training | Voice over 5G Standalone

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