Foreword

23.0143GPPRelease 17Support of Dual Tone Multi-Frequency (DTMF) signallingTS

This Technical Specification has been produced by the 3^rd Generation Partnership Project (3GPP).

The present document defines Dual Tone Multi Frequency (DTMF) signalling within the 3GPP system.

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

Version x.y.z

where:

x the first digit:

1 presented to TSG for information;

2 presented to TSG for approval;

3 Indicates TSG approved document under change control.

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

z the third digit is incremented when editorial only changes have been incorporated in the specification;