ETSI EN 301 420
         
          ETSI EN 301 420
          
        
          Digital cellular telecommunications system (Phase 2); Attachment requirements for Global System for Mobile communications (GSM); Mobile stations in the DCS 1 800 band and additional GSM 900 band; Telephony (GSM 13.02 version 4.0.1)
        
									
								standard published 12/01/1999 by European Telecommunications Standards Institute

				
					
