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		How do I check a VoIP gateway’s functionality before purchasing?
	
	
	
	
	
 
 
	
	
	
		
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		Ask for a live test: connect internet, place a call, check all ports.
	
	
	
	
	
 
 
	
	
	
		
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		See if you can log in to its web interface—sometimes used gateways have unknown passwords.
	
	
	
	
	
 
 
	
	
	
		
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		Check if it has the latest firmware, ensure no physical damage on the board (swollen capacitors, etc.).