Content for  TS 26.103  Word version:  16.0.0

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1  ScopeWord‑p. 5
The present Technical Specification outlines the Codec Lists in 3GPP including both systems, GSM and UMTS, to be used by the Out of Band Transcoder Control (OoBTC) protocol to set up a call or modify a call in Transcoder Free Operation (TrFO) and in "transcoder at the edge" scenarios.
The TS also specifies the SDP description of 3GPP Codecs to be used within a SIP-I -based circuit switched core network as specifies in TS 23.231.
The TS further specifies the coding of the Supported Codec List Information Elements for the UMTS radio access technology.
The TS further reserves the Code Point for the CSData (dummy) Codec Type for the negotiation of A-Interface Type and the RTP redundancy for CS Data and Fax services, see TS 48.008.
The Supported Codec List IE includes Codec_Types from the TDMA and PDC systems, to support TFO or TrFO between UMTS and TDMA, or UMTS and PDC.

2  Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]  TS 26.090   "AMR Speech Codec; Speech Transcoding Functions".
[2]  TS 26.093   "AMR Speech Codec; Source Controlled Rate Operation".
[3]  TS 26.101   "Mandatory Speech Codec Speech Processing Functions; AMR Speech Codec Frame Structure".
[4]  3GPP 46.0xx: "Enhanced Full Rate Codec Recommendations".
[5]  3GPP 26.0xx: "Adaptive Multi-Rate Codec Recommendations".
[6]  "ITU Q.765.5: "Use of Application Transport Mechanism for Bearer Independent Call Control"
[7]  TS 28.062   "In-band Tandem Free Operation (TFO) of Speech Codecs, Stage 3 - Service Description".
[8]  TS 23.153   "Out of Band Transcoder Control - Stage 2".
[9]  TS 24.008   "Mobile radio interface layer 3 specifications, Core Network Protocols"
[10]  TS 26.190   "AMR Wideband Speech Codec; Speech Transcoding Functions".
[11]  TS 26.193   "AMR Wideband Speech Codec; Source Controlled Rate Operation".
[12]  TS 26.201   "Mandatory Speech Codec Speech Processing Functions; AMR Wideband Speech Codec Frame Structure".
[13]  TS 23.172   "CS multimedia service UDI/RDI fallback and service modification; Stage 2".
[14]  TS 23.231   "SIP-I based circuit-switched core network; Stage 2".
[15]  TS 29.007   "General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".
[16]  RFC 3264  (2002): "An Offer/Answer Model with the Session Description Protocol (SDP)", J. Rosenberg and H. Schulzrinne.
[17]  RFC 3551  (2003): "RTP Profile for Audio and Video Conferences with Minimal Control", H. Schulzrinne and S. Casner.
[18]  void
[19]  RFC 4566  (2006): "SDP: Session Description Protocol", M. Handley, V. Jacobson and C. Perkins.
[20]  RFC 4733  (2006): "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals", H. Schulzrinne and T.Taylor.
[21]  RFC 4867  (2007): "RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs", J. Sjoberg, M. Westerlund, A. Lakaniemi and Q. Xie.
[22]  RFC 5993  (2010) "RTP Payload Format for Global System for Mobile Communications Half Rate (GSM-HR)".
[23]  TS 48.008   "Mobile Switching Centre - Base Station System (MSC-BSS) interface".
[24]  TS 26.102   "Adaptive Multi-Rate (AMR) speech codec; Interface to Iu, Uu and Nb".".
[25]  TS 26.441   "Codec for Enhanced Voice Services (EVS); General overview".
[26]  TS 26.442   "Codec for Enhanced Voice Services (EVS); ANSI C code (fixed-point)".
[27]  TS 26.443   "Codec for Enhanced Voice Services (EVS); ANSI C code (floating-point)".
[28]  TS 26.444   "Codec for Enhanced Voice Services (EVS); Test Sequences".
[29]  TS 26.445   "Codec for Enhanced Voice Services (EVS); Detailed algorithmic description".
[30]  TS 26.446   "Codec for Enhanced Voice Services (EVS); Adaptive Multi-Rate - Wideband (AMR-WB) backward compatible functions".
[31]  TS 26.447   "Codec for Enhanced Voice Services (EVS); Error concealment of lost packets".
[32]  TS 26.448   "Codec for Enhanced Voice Services (EVS); Jitter buffer management".
[33]  TS 26.449   "Codec for Enhanced Voice Services (EVS); Comfort Noise Generation (CNG) aspects".
[34]  TS 26.450   "Codec for Enhanced Voice Services (EVS); Discontinuous Transmission (DTX)".
[35]  TS 26.451   "Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)".
[36]  TR 26.952   "Codec for Enhanced Voice Services (EVS); Performance Characterization".
[37]  TS 26.453   "Codec for Enhanced Voice Services (EVS); Speech codec frame structure".
[38]  TS 26.454   "Codec for Enhanced Voice Services (EVS); Interface to Iu, Uu, Nb and Mb".
[39]  TS 29.163   "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks".
[40]  TS 26.452   "Codec for Enhanced Voice Services (EVS); ANSI C code; Alternative fixed-point using updated basic operators".

3  Definitions and AbbreviationsWord‑p. 7

3.1  Definitions

Codec Type:
defines a specific type of a speech Coding algorithm, applied on a specific radio access technology (e.g. GSM FR, (GSM) FR AMR).
Codec Mode:
defines a specific mode of a Codec Type (e.g. 12,2 kBit/s Mode of the (GSM) FR AMR).
Codec Configuration:
defines a specific set of attributes to a certain Codec Type (e.g. the combination of ACS and DTX="on" for (GSM) FR AMR).
Organisation Identifier (OID):
Identifies the standard organisation (e.g. 3GPP) producing a specification for a Codec List. ITU-T is responsible for maintaining the list of Organisation Identifiers.
System Identifier (SysID):
Identifies the radio access technology (e.g. GSM or UMTS) for which the supported Codec List is defined.
Other definitions are given in TS 23.153.

3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply:
Active Codec (mode) Set
A-Interface User Plane over IP
BandWidth Multiplier
Codec Mode Request (for AMR and AMR-WB)
Codec IDentifier
Circuit Switched
Circuit Switched Data and Fax dummy Codec
Discontinuous Transmission (of speech and audio signals, synonym to SCR)
Enhanced Voice Services
Codec Mode Request for EVS
Fullband (audio bandwidth)
Global System for Mobile communication
Narrowband (audio bandwidth)
Nb-Interface User Plane transport over IP in a SIP-I -based network
Organisation IDentifier (e.g. ITU-T, 3GPP)
Out of Band Transcoder Control
Personal Digital Communication (synonym for ...)
Source Controlled Rate operation (synonym to DTX )
Silence Descriptor
Super Wideband (audio bandwidth)
System Identifier
Time Division Multiple Access (synonym for ...)
Tandem Free Operation (also sometimes called "Transcoder-Through" or "Codec-Bypass")
Transcoder Free Operation
Universal Mobile Telecommunications System
Wideband (audio bandwidth)

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