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Voice Over Lte (volte) & Ims: The Complete Technical Guide
Published 1/2026
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Language: English | Duration: 2h 51m | Size: 2.04 GB [/center]
IMS Architecture & Security, SIP Signaling, User Identities, Call Flows, Codecs (AMR, EVS), Roaming, SRVCC Evolution
What you'll learn
Understand how voice services evolved from 2G/3G circuit-switched networks to VoLTE
Explain the end-to-end VoLTE architecture and the role of IMS
Identify and explain the functions of P-CSCF, I-CSCF, S-CSCF, and Application Servers
Understand IMS user identities (IMPI, IMPU) and service profiles
Analyze SIP signaling, including SIP methods and services used in VoLTE
Understand IMS registration procedures, including P-CSCF discovery
Explain end-to-end SIP call flows for VoLTE call setup and teardown
Understand how EPS bearers (QCI 5 and QCI 1) support VoLTE signaling and media
Explain LTE attach procedures and VoLTE-specific LTE integration
Understand speech codecs used in VoLTE, including AMR and EVS, and their impact on voice quality
Explain the role of IMS security and IMS-AKA during registration
Understand Media Resource Functions (MRF) and real-world service scenarios
Analyze IMS interworking with PSTN and legacy circuit-switched networks
Understand the role of MMTel Application Server in VoLTE services
Explain ENUM and DNS-based routing in VoLTE networks
Understand IMS roaming architectures, including LBO and S8 Home Routed
Explain SRVCC and enhanced SRVCC, including why handover delays occur
Confidently read and explain real-world VoLTE signaling diagrams and call flows
Requirements
Basic Knowledge About Architecture of 4G Systems
Description
Voice over LTE (VoLTE) is the backbone of modern voice communication in 4G and beyond. However, its underlying architecture-IMS (IP Multimedia Subsystem)-is often considered complex, fragmented, and difficult to understand.This course is designed to demystify VoLTE and IMS by explaining concepts clearly, logically, and step by step-starting from mobile network fundamentals and progressing all the way to real-world VoLTE call flows, LTE procedures, and SRVCC evolution.Whether you are a telecom engineer, network planner, NOC engineer, student, or instructor, this course will give you a solid conceptual and practical understanding of how voice works over LTE networks. Here is the outline of the course:Section 1: Introduction VOLTEThree main components of a mobile networkEvolution of voice services from 2G to 4GGSMA profile for Voice over LTE (VoLTE)Section 2: IMS - The Bigger PictureIntroduction to IP Multimedia Subsystem (IMS)IMS architecture: different layersIMS control layerCall Session Control Functions (CSCFs)
roxy-CSCF (P-CSCF)Interrogating-CSCF (I-CSCF)Serving-CSCF (S-CSCF)Application Servers (AS) in IMSProtocols used in IMSSession Initiation Protocol (SIP)Services provided by SIPSIP methodsSection 3: IMS User IdentitiesIMS Private Identity (IMPI)IMS Public User Identity (IMPU)Service profileSIP User Agent (SIP-UA)Section 4: High-Level IMS ProceduresIMS public connectivity requirementEPS bearers for IMS connectivityIMS integration in 4GIMS registration: P-CSCF discoveryUE registration with IMS in VoLTE (signal flow)End-to-end signaling path for call setupEnd-to-end SIP signaling for call setup and media bearer establishmentIMS media bearer teardownSection 5: Voice Codecs for VoLTESpeech codecs for Voice over IPVoLTE codecsDifferent speech qualitiesNarrowband and wideband Adaptive Multi-Rate (AMR) codecsEnhanced Voice Services (EVS) codecs and operating modesSection 6: Other IMS ProceduresThird-party registrationApplication Server (AS) subscription to registration event packageSecurity in VoLTEIMS-AKA during IMS registrationMedia Resource Function (MRF) and its componentsExample scenario: playing an "Insufficient Balance" announcementExample scenario: starting a conference callInterconnect Border Control Function (IBCF)Transition Gateway (TrGW)IMS-CS interworkingExample: IMS to PSTN call flowCore functions of the MMTel Application ServerRole of MMTel in the call flowDirect User Interface (Ut interface)Role of ENUM and DNS in VoLTE routingENUM and DNS in end-to-end call flowAccess Point Name (APN)Critical APNs for VoLTE:IMS APNUt APNIMS roaming architectures:Local Break-Out (LBO)S8 Home Routed (S8HR)Section 7: 4G LTE-Specific Procedures in VoLTEHigh-level steps in a VoLTE callLTE attach procedure: power-on and registrationLTE attach procedure: default EPS bearer establishmentNetwork registration and voice capability exchangeEstablishment of default EPS bearer (QCI = 5)Dedicated EPS bearer creation (QCI = 1)Section 8: SRVCC and Its EvolutionIntroduction to Single Radio Voice Call Continuity (SRVCC)SRVCC procedureReasons for high SRVCC handover delayIntroduction to enhanced SRVCC (eSRVCC) and preconditionsEnhanced SRVCC (eSRVCC) procedureSRVCC evolution overview
Who this course is for
Telecom engineers working with LTE, VoLTE, IMS, or core networks
Core network, VoLTE, and IMS professionals involved in design, planning, testing, or optimization
NOC and operations engineers who monitor or troubleshoot VoLTE and IMS issues
Telecom students and fresh graduates seeking practical, industry-relevant knowledge
Professionals preparing for interviews or certifications related to LTE, IMS, or VoLTE
Voice Over Lte (volte) & Ims: The Complete Technical Guide
Published 1/2026
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Language: English | Duration: 2h 51m | Size: 2.04 GB [/center]
IMS Architecture & Security, SIP Signaling, User Identities, Call Flows, Codecs (AMR, EVS), Roaming, SRVCC Evolution
What you'll learn
Understand how voice services evolved from 2G/3G circuit-switched networks to VoLTE
Explain the end-to-end VoLTE architecture and the role of IMS
Identify and explain the functions of P-CSCF, I-CSCF, S-CSCF, and Application Servers
Understand IMS user identities (IMPI, IMPU) and service profiles
Analyze SIP signaling, including SIP methods and services used in VoLTE
Understand IMS registration procedures, including P-CSCF discovery
Explain end-to-end SIP call flows for VoLTE call setup and teardown
Understand how EPS bearers (QCI 5 and QCI 1) support VoLTE signaling and media
Explain LTE attach procedures and VoLTE-specific LTE integration
Understand speech codecs used in VoLTE, including AMR and EVS, and their impact on voice quality
Explain the role of IMS security and IMS-AKA during registration
Understand Media Resource Functions (MRF) and real-world service scenarios
Analyze IMS interworking with PSTN and legacy circuit-switched networks
Understand the role of MMTel Application Server in VoLTE services
Explain ENUM and DNS-based routing in VoLTE networks
Understand IMS roaming architectures, including LBO and S8 Home Routed
Explain SRVCC and enhanced SRVCC, including why handover delays occur
Confidently read and explain real-world VoLTE signaling diagrams and call flows
Requirements
Basic Knowledge About Architecture of 4G Systems
Description
Voice over LTE (VoLTE) is the backbone of modern voice communication in 4G and beyond. However, its underlying architecture-IMS (IP Multimedia Subsystem)-is often considered complex, fragmented, and difficult to understand.This course is designed to demystify VoLTE and IMS by explaining concepts clearly, logically, and step by step-starting from mobile network fundamentals and progressing all the way to real-world VoLTE call flows, LTE procedures, and SRVCC evolution.Whether you are a telecom engineer, network planner, NOC engineer, student, or instructor, this course will give you a solid conceptual and practical understanding of how voice works over LTE networks. Here is the outline of the course:Section 1: Introduction VOLTEThree main components of a mobile networkEvolution of voice services from 2G to 4GGSMA profile for Voice over LTE (VoLTE)Section 2: IMS - The Bigger PictureIntroduction to IP Multimedia Subsystem (IMS)IMS architecture: different layersIMS control layerCall Session Control Functions (CSCFs)
roxy-CSCF (P-CSCF)Interrogating-CSCF (I-CSCF)Serving-CSCF (S-CSCF)Application Servers (AS) in IMSProtocols used in IMSSession Initiation Protocol (SIP)Services provided by SIPSIP methodsSection 3: IMS User IdentitiesIMS Private Identity (IMPI)IMS Public User Identity (IMPU)Service profileSIP User Agent (SIP-UA)Section 4: High-Level IMS ProceduresIMS public connectivity requirementEPS bearers for IMS connectivityIMS integration in 4GIMS registration: P-CSCF discoveryUE registration with IMS in VoLTE (signal flow)End-to-end signaling path for call setupEnd-to-end SIP signaling for call setup and media bearer establishmentIMS media bearer teardownSection 5: Voice Codecs for VoLTESpeech codecs for Voice over IPVoLTE codecsDifferent speech qualitiesNarrowband and wideband Adaptive Multi-Rate (AMR) codecsEnhanced Voice Services (EVS) codecs and operating modesSection 6: Other IMS ProceduresThird-party registrationApplication Server (AS) subscription to registration event packageSecurity in VoLTEIMS-AKA during IMS registrationMedia Resource Function (MRF) and its componentsExample scenario: playing an "Insufficient Balance" announcementExample scenario: starting a conference callInterconnect Border Control Function (IBCF)Transition Gateway (TrGW)IMS-CS interworkingExample: IMS to PSTN call flowCore functions of the MMTel Application ServerRole of MMTel in the call flowDirect User Interface (Ut interface)Role of ENUM and DNS in VoLTE routingENUM and DNS in end-to-end call flowAccess Point Name (APN)Critical APNs for VoLTE:IMS APNUt APNIMS roaming architectures:Local Break-Out (LBO)S8 Home Routed (S8HR)Section 7: 4G LTE-Specific Procedures in VoLTEHigh-level steps in a VoLTE callLTE attach procedure: power-on and registrationLTE attach procedure: default EPS bearer establishmentNetwork registration and voice capability exchangeEstablishment of default EPS bearer (QCI = 5)Dedicated EPS bearer creation (QCI = 1)Section 8: SRVCC and Its EvolutionIntroduction to Single Radio Voice Call Continuity (SRVCC)SRVCC procedureReasons for high SRVCC handover delayIntroduction to enhanced SRVCC (eSRVCC) and preconditionsEnhanced SRVCC (eSRVCC) procedureSRVCC evolution overviewWho this course is for
Telecom engineers working with LTE, VoLTE, IMS, or core networks
Core network, VoLTE, and IMS professionals involved in design, planning, testing, or optimization
NOC and operations engineers who monitor or troubleshoot VoLTE and IMS issues
Telecom students and fresh graduates seeking practical, industry-relevant knowledge
Professionals preparing for interviews or certifications related to LTE, IMS, or VoLTE
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