3GPP 26-series — CODECs

The technical specifications (TS) are displayed in blue, while the reports (TR) are shown in green. TS that have been discontinued in earlier releases are indicated with a light blue color. TR in the '9' range that have been stopped are highlighted in light green. TS or TR with a yellow background indicate those updated at the latest Q1-2025 Plenary Meetings. The new ones are displayed with a single red dotted overline.

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click here to see the new 26-series documents introduced at each 3GPP quarterly Plenary Meeting

26.0… 26.1… 26.2… 26.3… 26.4… 26.5… 26.8… 26.9…

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Adaptive Multi-Rate (AMR) Speech Codec
TS 26.071	REL 3 → 18	General Description
TS 26.073	REL 3 → 18	ANSI-C Code
TS 26.074	REL 3 → 18	Test Sequences
TS 26.077	REL 4 → 18	Minimum Performance Requirements for Noise Suppresser
TS 26.090	REL 3 → 18	Transcoding Functions
TS 26.091	REL 3 → 18	Error Concealment of Lost Frames
TS 26.092	REL 3 → 18	Comfort Noise Aspects
TS 26.093	REL 3 → 18	Source Controlled Rate Operation
TS 26.094	REL 3 → 18	Voice Activity Detector (VAD)


TS 26.101	REL 3 → 18	AMR Speech Codec – Frame structure
TS 26.102	REL 3 → 18	AMR Speech Codec – Interface to Iu, Uu and Nb
TS 26.103	REL 3 → 18	Speech Codec List for GSM and UMTS
TS 26.104	REL 3 → 18	ANSI-C Code for the floating-point AMR Speech Codec
TS 26.110	REL 3 → 18	Codec for Circuit Switched Multimedia Telephony Service – General Description
TS 26.111	REL 3 → 18	Codec for Circuit Switched Multimedia Telephony Service – Modifications to H.324
TS 26.113	REL 18	Real-Time Media Communication – Protocols and APIs
TS 26.114	REL 7 → 19	IMS Multimedia Telephony – Media Handling and Interaction
TS 26.115	REL 4 → 18	Echo Control for Speech and Multimedia Services
TS 26.116	REL 13 → 18	Television (TV) over 3GPP Services – Video Profiles
TS 26.117	REL 16 → 18	5G Media Streaming (5GMS) – Speech and Audio Profiles
TS 26.118	REL 15 → 18	3GPP Virtual Reality Profiles for Streaming Applications
TS 26.119	REL 18	Media Capabilities for Augmented Reality
TS 26.130	REL 18	Speech/Audio Codec RTP Payload Format Conformance for UE Testing
TS 26.131	REL 3 → 18	Terminal Acoustic Characteristics for Telephony – Requirements
TS 26.132	REL 3 → 18	Speech and Video Telephony Terminal Acoustic Test Specification
TS 26.139	REL 16 → 18	RTP/RTCP verification procedures
TS 26.140	REL 5 → 18	MMS Media Formats and Codecs
TS 26.141	REL 6 → 18	IMS Messaging and Presence – Media Formats and Codecs
TS 26.142	REL 7 → 18	Dynamic and Interactive Multimedia Scenes (DIMS)
TS 26.143	REL 18	Messaging Media profiles
TS 26.150	REL 9 → 18	Syndicated Feed Reception (SFR) within 3GPP Environments – Protocols and Codecs

Adaptive Multi-Rate - Wideband (AMR-WB) Speech Codec
TS 26.171	REL 5 → 18	General Description
TS 26.173	REL 5 → 18	C-Source Code
TS 26.174	REL 5 → 18	Test Sequences

TS 26.177	REL 6 → 18	DSR Extended Advanced Front-End – Test Sequences
TS 26.179	REL 13 → 18	Mission Critical Push To Talk (MCPTT) – Codecs and Media Handling

Adaptive Multi-Rate - Wideband (AMR-WB) Speech Codec
TS 26.190	REL 5 → 18	Transcoding Functions
TS 26.191	REL 5 → 18	Error Concealment of Erroneous or Lost Frames
TS 26.192	REL 5 → 18	Comfort Noise Aspects
TS 26.193	REL 5 → 18	Source Controlled Rate Operation
TS 26.194	REL 5 → 18	Voice Activity Detector (VAD)



Adaptive Multi-Rate - Wideband (AMR-WB) Speech Codec
TS 26.201	REL 5 → 18	Frame Structure
TS 26.202	REL 5 → 18	Interface to Iu, Uu and Nb
TS 26.204	REL 5 → 18	Floating-point C-source code

TS 26.223	REL 13 → 18	Telepresence using IMS – Media Handling and Interaction

Cellular Text Telephone Modem
TS 26.226	REL 5 → 18	General description
TS 26.230	REL 5 → 18	Transmitter bit exact C-code
TS 26.231	REL 5 → 18	Minimum Performance Requirements

TS 26.233	REL 4 → 15	PSS – General description
TS 26.234	REL 4 → 18	PSS – Protocols and codecs
TS 26.235	REL 5 → 12	PS conversational multimedia applications – Default codecs
TS 26.236	REL 5 → 12	PS conversational multimedia applications – Transport protocols
TS 26.237	REL 8 → 18	IMS-based PSS and MBMS user service – Protocols
TS 26.238	REL 15 → 18	Uplink streaming framework
TS 26.243	REL 6 → 18	DSR extended advanced front-end – Fixed-point ANSI-C code
TS 26.244	REL 6 → 18	PSS – 3GP file format
TS 26.245	REL 6 → 18	PSS – Timed text format
TS 26.246	REL 6 → 18	PSS – 3GPP SMIL language profile
TS 26.247	REL 10 → 18	PSS – Progressive Download and Dynamic Adaptive Streaming over HTTP
TS 26.249	REL 18	Immersive Audio for Split Rendering Scenarios Detailed Algorithmic Description of Split Rendering Functions

Codec for Immersive Voice and Audio Services (IVAS)
TS 26.250	REL 18	General overview
TS 26.252	REL 18	Test sequences
TS 26.253	REL 18	Detailed Algorithmic Description incl. RTP payload format and SDP parameter definitions
TS 26.254	REL 18	Rendering
TS 26.255	REL 18	Error concealment of lost packets
TS 26.256	REL 18	Jitter Buffer Management
TS 26.258	REL 18	C code (floating-point)

TS 26.259	REL 15 → 18	Subjective Test Methodologies for the evaluation of Immersive Audio Systems

TS 26.260	REL 15 → 18	Objective Test Methodologies for the evaluation of Immersive Audio Systems
TS 26.261	REL 18	Terminal Audio Quality Performance requirements for Immersive Audio Services
TS 26.264	REL 18	IMS-based AR Real-Time Communication

eCall Data Transfer - In-Band Modem Solution
TS 26.267	REL 8 → 18	General Description
TS 26.268	REL 8 → 18	ANSI-C Reference Code
TS 26.269	REL 8 → 18	Conformance Testing

Extended Adaptive Multi-Rate - Wideband (AMR-WB+) Speech Codec
TS 26.273	REL 6 → 18	Fixed-Point ANSI-C Code
TS 26.274	REL 6 → 18	Conformance Testing

TS 26.281	REL 14 → 18	Mission Critical Video (MCVideo) – Codecs and Media Handling
TS 26.290	REL 6 → 18	AMR-WB+ Speech Codec – Transcoding Functions


TS 26.304	REL 6 → 18	AMR-WB+ Speech Codec – Floating-Point ANSI-C Code
TS 26.307	REL 13 → 18	Presentation Layer for 3GPP Services
TS 26.346	REL 6 → 19	MBMS protocols and codecs
TS 26.347	REL 14 → 18	MBMS – Application Programming Interface and URL
TS 26.348	REL 16 → 18	Northbound API for MBMS at the xMB reference point



Enhanced aacPlus General Audio Codec
TS 26.401	REL 6 → 18	General Description
TS 26.402	REL 6 → 18	Additional Decoder Tools
TS 26.403	REL 6 → 18	Encoder specification – AAC part
TS 26.404	REL 6 → 18	Encoder specification – SBR part
TS 26.405	REL 6 → 18	Encoder specification – Parametric stereo part
TS 26.406	REL 6 → 18	Conformance testing
TS 26.410	REL 6 → 18	Floating-point ANSI-C code
TS 26.411	REL 6 → 18	Fixed-point ANSI-C code

TS 26.412	REL 6 → 18	Source Code for 3GP File Format
TS 26.430	REL 9 → 18	Timed Graphics

Codec for Enhanced Voice Services (EVS)
TS 26.441	REL 12 → 18	General Overview
TS 26.442	REL 12 → 18	ANSI C Code (Fixed-Point)
TS 26.443	REL 12 → 18	ANSI C Code (Floating-Point)
TS 26.444	REL 12 → 18	Test Sequences
TS 26.445	REL 12 → 18	Detailed Algorithmic Description
TS 26.446	REL 12 → 18	AMR-WB Backward Compatible Functions
TS 26.447	REL 12 → 18	Error Concealment of Lost Packets
TS 26.448	REL 12 → 18	Jitter Buffer Management
TS 26.449	REL 12 → 18	Comfort Noise Generation (CNG) Aspects
TS 26.450	REL 12 → 18	Discontinuous Transmission (DTX)
TS 26.451	REL 12 → 18	Voice Activity Detection (VAD)
TS 26.452	REL 16 → 18	ANSI C Code – Alternative Fixed-Point using Updated Basic Operators
TS 26.453	REL 13 → 18	Speech Codec Frame Structure
TS 26.454	REL 13 → 18	Interface to Iu, Uu, Nb and Mb


TS 26.501	REL 16 → 19	5G Media Streaming (5GMS) – General Description and Architecture
TS 26.502	REL 17 → 19	5G Multicast-Broadcast User Service Architecture
TS 26.506	REL 18 → 19	5G Real-Time Media Communication Architecture – Stage 2
TS 26.510	REL 18	Media Delivery Interactions and APIs for Provisioning and Media Session Handling
TS 26.511	REL 16 → 18	5G Media Streaming (5GMS) – Profiles, Codecs and Formats
TS 26.512	REL 16 → 18	5G Media Streaming (5GMS) – Protocols
TS 26.517	REL 17 → 18	5G Multicast-Broadcast User Services – Protocols and Formats
TS 26.522	REL 18 → 19	5G Real-time Media Transport Protocol Configurations
TS 26.531	REL 17 → 18	Data Collection and Reporting – General Description and Architecture
TS 26.532	REL 17 → 18	Data Collection and Reporting – Protocols and Formats
TS 26.565	REL 18	Split Rendering Media Service Enabler


TR 26.801	REL 16 → 18	UE Supporting Handset Mode with Non-Traditional Earpieces
TR 26.802	REL 17 → 19	Multicast Architecture Enhancement for 5G Media Streaming
TR 26.803	REL 17	Study on 5G Media Streaming Extensions for Edge Processing
TR 26.804	REL 17 → 19	Study on 5G Media Streaming extensions
TR 26.805	REL 17	Study on Media Production over 5G NPN Systems
TR 26.806	REL 18	Study on Tethering AR Glasses – Architectures, QoS and Media Aspects
TR 26.812	REL 18	QoE metrics for AR/MR services
TR 26.813	REL 19	Study of Avatars in Real-Time Communication Services
TR 26.818	REL 15	Virtual Reality (VR) Streaming Audio – Characterization Test Results
TR 26.822	REL 19	Study on 5G Real-time Transport Protocol Configurations, Phase 2
TR 26.827	REL 12	IMS-based Streaming and Download Delivery enhancements
TR 26.843	REL 16	Study on Non Bit-Exact Conformance Criteria and Tools for Floating-Point EVS Codec
TR 26.848	REL 12	Enhanced MBMS Operation
TR 26.849	REL 12	MBMS Operation On Demand
TR 26.850	REL 16	MBMS for IoT
TR 26.851	REL 11	Enhancements to Multimedia (EMM) – EMM, DDE and IPME Aspects
TR 26.852	REL 13 → 14	MBMS – Extensions and Profiling
TR 26.854	REL 19	Study on Haptics in 5G Media Services
TR 26.855	REL 19	Study on Film Grain Synthesis
TR 26.857	REL 18	5G Media Service Enablers
TR 26.861	REL 15	Investigations on Test Methodologies for Immersive Audio Systems
TR 26.862	REL 17	Immersive Teleconferencing and Telepresence for Remote Terminals (ITT4RT) Use Cases, Requirements and Potential Solutions
TR 26.865	REL 18	Immersive Audio for Split Rendering Scenarios; Requirements
TR 26.880	REL 14	Study on MBMS Usage and Codecs for MC Video Service
TR 26.881	REL 15	Forward Error Correction (FEC) for Mission Critical Services
TR 26.891	REL 16	5G Enhanced Mobile Broadband – Media Distribution


TR 26.901	REL 4	AMR-WB Speech Codec – Feasibility Study Report
TR 26.902	REL 7 → 18	Video Codec Performance
TR 26.903	REL 9 → 18	Improved Video support for PSS and MBMS Services
TR 26.904	REL 10 → 18	Improved Video Coding support
TR 26.905	REL 11 → 18	Mobile Stereoscopic 3D Video
TR 26.906	REL 12 → 18	Evaluation of High Efficiency Video Coding (HEVC) for 3GPP Services
TR 26.907	REL 12 → 18	HTML5 for a New Presentation Layer in 3GPP Services
TR 26.909	REL 14 → 18	Study on improved Streaming Quality of Experience (QoE) Reporting in 3GPP Services and Networks
TR 26.910	REL 16 → 18	Study on Media Handling aspects of RAN Delay Budget Reporting in MTSI
TR 26.911	REL 3 → 18	Codecs for CS Multimedia Telephony Service – Terminal Implementor's Guide
TR 26.912	REL 3 → 4	Codec for Circuit switched Multimedia Telephony Service Quantitative Performance Evaluation of H.324 Annex C over 3G
TR 26.914	REL 7 → 18	Multimedia Telephony over IMS – Optimization Opportunities
TR 26.915	REL 3	Echo Control for Speech and Multi-Media Services
TR 26.916	REL 14	Media Handling and Quality aspects of SRVCC
TR 26.917	REL 15 → 18	MBMS/PSS enhancements to Support Television Services
TR 26.918	REL 15 → 18	Virtual Reality (VR) Media Services over 3GPP
TR 26.919	REL 16 → 18	Study on Media Handling aspects of Conversational Services in 5G Systems
TR 26.921	REL 16 → 18	Investigations on ambient noise reproduction systems for acoustic testing of terminals
TR 26.922	REL 13 → 18	Video Telephony Robustness improvements extensions – Performance Evaluation
TR 26.923	REL 13 → 18	Study on Media Handling aspects of IMS-based Telepresence
TR 26.924	REL 13 → 18	Study on improved End-to-End QoS Handling for MTSI
TR 26.925	REL 16 → 18	Typical traffic characteristics of media services on 3GPP networks
TR 26.926	REL 18 → 19	Traffic Models and Quality Evaluation Methods for Media and XR Services in 5G Systems
TR 26.928	REL 16 → 18	Extended Reality (XR) in 5G
TR 26.929	REL 16 → 18	QoE Parameters and Metrics relevant to the Virtual Reality (VR) User Experience
TR 26.930	REL 18	Study on the enhancement for Immersive Real-Time communication for WebRTC
TR 26.931	REL 15 → 18	Evaluation of Additional Acoustic Tests for Speech Telephony
TR 26.933	REL 19	Study on Diverse Audio Capturing system
TR 26.935	REL 6 → 18	PS Conversational Multimedia Applications – Performance Characterisation of Default Codecs
TR 26.936	REL 6 → 18	Performance Characterization of 3GPP Audio Codecs
TR 26.937	REL 5 → 18	PSS – RTP usage model
TR 26.938	REL 12 → 18	PSS – improved support for Dynamic Adaptive Streaming over HTTP in 3GPP
TR 26.939	REL 15 → 18	Guidelines on the Framework for Live Uplink Streaming
TR 26.941	REL 18 → 19	Network Slicing Extensions for 5G media services
TR 26.942	REL 19	Study on Media enerGy consumption exposuRE and EvaluatioN framework
TR 26.943	REL 6 → 18	Recognition Performance Evaluations of Codecs for Speech Enabled Services (SES)
TR 26.944	REL 7 → 18	End-to-End Multimedia Services Performance Metrics
TR 26.946	REL 6 → 18	MBMS User Service Guidelines
TR 26.947	REL 11 → 18	MBMS – Selection and Characterisation of Application Layer Forward Error Correction (FEC)
TR 26.948	REL 13 → 18	Study on Video enhancements in 3GPP Multimedia Services
TR 26.949	REL 13 → 18	Video Formats for 3GPP Services
TR 26.950	REL 10 → 18	Study on Surround Sound Codec extension for PSS and MBMS
TR 26.952	REL 12 → 18	EVS Codec Performance Characterization
TR 26.953	REL 14 → 18	Interactivity support for 3GPP-based Streaming and Download Services
TR 26.954	REL 14 → 18	Test Plan for Speech Quality and Delay through a Headset Electrical Interface
TR 26.955	REL 17 → 18	Video Codec characteristics for 5G-based services and applications
TR 26.957	REL 14 → 18	Study on Server And Network-assisted Dynamic Adaptive Streaming over HTTP (DASH) (SAND) for 3GPP Multimedia Services
TR 26.959	REL 15 → 18	Study on enhanced Voice over LTE (VoLTE) Performance
TR 26.962	REL 17 → 18	Immersive Teleconferencing and Telepresence for Remote Terminals (ITT4RT) Operation and Usage Guidelines
TR 26.966	REL 18	Evaluation of new HEVC coding tools
TR 26.967	REL 8 → 18	eCall Data Transfer – In-band Modem Solution
TR 26.969	REL 8 → 18	eCall Data Transfer – In-band Modem Solution – Characterization Report
TR 26.973	REL 15 → 18	Update to Fixed-Point Basic Operators
TR 26.975	REL 3 → 18	AMR Speech Codec – Performance Characterization
TR 26.976	REL 5 → 18	AMR-WB Speech Codec – Performance Characterization
TR 26.978	REL 4 → 18	Results of the AMR Noise Suppression Selection Phase
TR 26.980	REL 13 → 18	MTSI – Media Handling aspects of Multi-Stream Multiparty Conferencing for Multimedia Telephony Service for IMS
TR 26.981	REL 14 → 18	MBMS extensions for Provisioning and Content Ingestion
TR 26.982	REL 18	Implementation guidelines for Multiparty RTT
TR 26.985	REL 16 → 18	V2X Media Handling and Interaction
TR 26.989	REL 13 → 18	MCPTT – Media, Codecs and MBMS enhancements for MCPTT over LTE
TR 26.996	REL 18	Immersive Audio for Split Rendering Scenarios Performance characterization
TR 26.997	REL 18	Codec for Immersive Voice and Audio Services (IVAS) Performance characterization
TR 26.998	REL 17 → 18	Support of 5G glass-type Augmented Reality / Mixed Reality (AR/MR) devices
TR 26.999	REL 17 → 18	Virtual Reality (VR) streaming interoperability and characterization