ETSI EN 300 925
         
          ETSI EN 300 925
          
        
          Digital cellular telecommunications system (Phase 2+) (GSM); Voice Group Call Service (VGCS) - Stage 1 (GSM 02.68 version 6.0.1 Release 1997)
        
									
								standard published 09/01/1999 by European Telecommunications Standards Institute

 
							 
				 
					
