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) Edition: 4.0.0European Telecommunications Standards Institute / 01-Mar-2001 / 14 pages