ETSI EN 301 702
         
          ETSI EN 301 702
          
        
          Digital cellular telecommunications system (Phase 2+) (GSM); User-to-User Signalling (UUS); Service description, Stage 1 (GSM 02.87 version 7.1.2 Release 98)
        
									
								standard published 12/01/1999 by European Telecommunications Standards Institute

				
					
