Please click here to test VoIP connectivity.

You will see a new page with several tabs:

  • Firewall (the tab with a flame icon).
    The testing tool checks whether port 5060 is open for TCP traffic (responsible for authentication) and UDP traffic, and shows the results on this tab.
  • Speed.
    The testing tool checks for bandwidth and displays results here.
  • VoIP.
    The testing tool emulates VoIP flow and provides results for jitter and packet loss.
    Note: Jitter is a measure of the difference in time that each packet takes to reach the destination. In an ideal world, it would be nice if each packet sent took exactly the same time to travel between the client and the server (0% jitter), but in reality this is seldom the case. Packets vary in the length of time it takes to reach the destination (latency), which on a bad connection can be much
    larger. Jitter is an expression of the variance.
  • RTT.
    This tab shows the length and consistency of the round trip time (RTT). RTT is the time it takes for a packet to be sent end-to-end from the client to the server and back. The length and consistency of the trip time ultimately defines the TCP throughput speed. A long trip time will dramatically slow connection throughput speed. An erratic trip time is an early indication of regulation or congestion problems.
  • Graph.
    This tab shows data transfer speed during the test.
    In the Plot box, you can select from the following views:
    • Download speed
    • Upload speed
    • Upstream jitter and packet loss
    • Downstream jitter and packet loss


  • Summary.
    This tab shows the outcome of all tests that were performed on the tabs described above, and indicates whether there are any connection issues.