ETSI TS 101 376-3-8
ETSI TS 101 376-3-8
GEO-Mobile Radio Interface Specifications; Part 3: Network specifications; Sub-part 8: Support of Dual-Tone Multifrequency Signalling (DTMF); GMR-1 03.014 Edition: 1.1.1European Telecommunications Standards Institute / 01-Mar-2001 / 14 pages