ETSI EN 301 711
         
          ETSI EN 301 711
          
        
          Digital cellular telecommunications system (Phase 2+) (GSM); User-to-User Signalling (UUS); Stage 3 (GSM 04.87 version 7.0.2 Release 1998)
        
									
								standard published 12/01/1999 by European Telecommunications Standards Institute

				
					
