ETSI TS 123 014
ETSI TS 123 014
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Support of Dual Tone Multi-Frequency (DTMF) signalling (3GPP TS 23.014 version 4.0.0 Release 4)
standard published 03/01/2001 by European Telecommunications Standards Institute
