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        首頁 > Support > Help desk > 正文
        
	
	
        
				
				
		
        
				
				
			
        Q: what is “BLF”?
        
			
        更新時間：2015-04-15點擊次數(shù)：2731次
        
			
			
			
					
			
        
				
        
	A:  It is used to indicate the line status.You can know other device’s status by programmable keys or Extension units set mode to BLF.It will light greenwhen it free, light red when it on the line, flashingred light when it ringing.