Troubleshooting tools

Internet Speed Test


Link: Telyphone Internet Speed Test.

When setting up QoS on any router, it is equally important to setup traffic shaping. If not, all outgoing packets, whether prioritized or not, may congest your WAN uplink and create self induced packet loss.

We suggest that you run 2-3 speed test and use the average speed result as your basis. When configuring the traffic shaping it’s recommended to throttle your speed to 90% of your average available speed. This is your safe harbor.

Allowing your router to use more that this amount can create network issues that will affect your VoIP Audio Quality.

The Telyphone Internet Speed Test is available to use on any web browser. You should avoid running this test over a wifi connection or your result can be affected.



Please check on multiple browsers like Chrome, Explorer, FireFox, Safari as you might get different speed test results.


A SIP ALG can and usually does exist on Routers, Modems or in rare cases a managed switch.

You must disable this feature for any VoIP service to operate as expected.


Client Based Testing

This link will download a small .exe agent that can test for the presence of a SIP ALG on the network the host PC is connected to..

After downloading, open the file and accept any permissions your windows/mac machine may ask for.

If the results = False then a SIP ALG was not detected by the client.

If the results = True then a SIP ALG is active and must be turned off.


Web Based Testing

Visualware is a provider of internet based VoIP testing tools.

They offer a series of VoIP test tools that include a SIP ALG tester.

Below are 2 links to some of their web based test.

This option must be run using internet explorer with java enabled.

This option runs using HTML5 and their custom plugin.



These web test will simulate 1 VoIP Call using the 711 codec and provide a realtime analysis of that call.

Note: That analysis ONLY represents the quality of that single call and should not be used as a benchmark for real calling scenarios with multiple active calls during an extended period of time.


After the test completes click on the ‘VoIP’ tab and look for ‘N‘ or ‘Y‘ on the ‘SIP ALG Firewall‘ line in the lower white box.

If you see “SIP ALG Firewall: Y” then a SIP ALG is active and must be turned off.

If you see “SIP ALG Firewall: N” then a SIP ALG is was not detected.