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QoS setup

Need help finding the best router or access point? Checkout our Recommended Networking Equipment section

New to this section? Checkout our series on how to debug network related call quality issues.

What is QoS?

QoS, or Quality of Service, is used to refer to ways in which your router can re-order (or drop) certain types of traffic on your network in order to meet a certain service level. The most common use of QoS is to prioritize audio/video or gaming applications...or to de-prioritize P2P applications like bittorrent.

Why do I need QoS?

Most homes and offices don't have the luxury of providing more bandwidth than can be reasonably consumed. This creates scenarios where the users on a network are consuming the entire supply of bandwidth offered by the ISP. When demand is greater than supply, traffic in/out of your network starts backing up -- this backup is what causes VoIP calls to be choppy.

How do I set up QoS on my router?

Each router's configuration is slightly different. Consult your router's user manual to determine 1) if QoS is a feature offered by the router and 2) how to set up QoS rules.

Which services should I prioritize? VoIP traffic:

  • TCP and UDP, SIP protocol, port 5060-5065 (High priority)
  • UDP, RTP protocol, ports 10000-32768 (Highest priority) Application traffic:

  •, TCP, port 443 (High priority)

If you're on a wireless network, please enable WMM.

If you're unable to prioritize the entire RTP port range on your network you can look for traffic tagged with DSCP 46 High Priority and use that to identify the RTP stream (voice) of any call.

It's asking for the upstream and downstream bandwidth of my connection, what do I enter?

Be very aggressive when setting the upload and download speed of the connection. To determine the correct bandwidth settings for your QoS engine, it's recommended to run a test of your connection on and then set values to 80% of what's reported. For example, if you have a 20Mbit/1Mbit ADSL connection and reports 18Mbit/768Kbit of "real bandwidth", set your QoS bandwidth to 14.4Mbit/614Kbit.

How can I tell if QoS is working?

Capture and analyze live call traffic during normal business hours to compare results when QoS is turned on vs off.

If you have any questions about setting advanced QoS settings please send us at email to