Table of Contents

Intellectual Property Rights
Foreword
1 Scope
2 References
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 Main Concepts
5 TFO Architecture and Transmission Mechanism
  5.1 TFO Access Interfaces and Reference Points
  5.2 General In-band Transmission Mechanism for TFO
  5.3 High-Level Functions Required for TFO
6 Model of operation
  6.1 Overview
  6.2 TFO establishment phase
  6.3 Transparency of transmission equipments
  6.4 Modification of speech codec
  6.5 TFO operation
7 Compatibility Issues
8 Interactions with Other Services
  8.1 General
  8.2 Support of DTMF
9 Operational Aspects
Annex A (Informative): Change history
History

Abstract

Defines the stage 2 description for the Tandem Free Operation feature which gives the capability to avoid using two GSM speech codecs in mobile to mobile speech calls. The main aim is to achieve improvements in speech quality. The TFO mode of operation could also be used to reduce inter-MSC transmission bandwidth requirements.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	SMG 11