Foreword

03.143GPPSupport of Dual Tone Multi-Frequency Signalling (DTMF) via the GSM SystemTS

This Technical Specification (TS) has been produced by the Special Mobile Group (SMG).

The present document defines the Discontinuous Reception (DRX) in the GSM system within the digital cellular telecommunications system.

The contents of the present document is subject to continuing work within SMG and may change following formal SMG approval. Should SMG modify the contents of the present document it will be re-released with an identifying change of release date and an increase in version number as follows:

Version 7.x.y

where:

7 indicates Release 1998 of GSM Phase 2+

x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.

y the third digit is incremented when editorial only changes have been incorporated in the specification.