ETSI TS 101 377-3-14
ETSI TS 101 377-3-14
GEO-Mobile Radio Interface Specifications; Part 3: Network specifications; Sub-part 14: Call Waiting (CW) and Call Hold (HOLD) Supplementary Services - Stage 2; GMR-2 03.083
standard published 03/01/2001 by European Telecommunications Standards Institute