ETSI TS 122 087
ETSI TS 122 087
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); User-to-User Signalling (UUS); Service description - Stage 1 (3G TS 22.087 version 3.1.0 Release 1999)
standard published 03/01/2000 by European Telecommunications Standards Institute
