Explanation:
Download Speed:
The pace at which data is transferred from the internet to your computer. Most wireless connections have more than enough bandwidth for VoIP. As long as the download speed is higher than 128KBPS then a VoIP call should be fine.
Upload Speed:
The pace at which data is sent from your computer to the internet. Again, as long as it's higher than 128 KBPS a VoIP call should be fine.
Jitter:
Variable delays in the delivery of packets of data. These can result in delays during VoIP calls. A high quality network will have less than 15ms of jitter, anything over 30ms is likely to be a significant problem.
RTT:
Stands for Round Trip Time and is the time taken for a small packet to make a round trip in the network path being tested. A high quality network will have an RTT of less than 150ms, while anything higher than 300ms is poor.
Packet Success:
Your call is being sent in packets. If some are getting lost, so are parts of your call.
Assessing how well a particular network will perform is a fiendishly complex thing, as it's dependent on a variety of factors and furthermore will vary over time. WorkSnug's VoIP checker tests the key variables and makes a broad assessment but users should be aware that this is intended as an indicative tool only.
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