I have the privilege of trying to optimize our network at work to help improve the quality of the voip system we have. The general setup is:
- Bandwidth is 18 Mbps down, 3 Mbps up.
- ~10 people in office with max ~5 tje on phone at any time.
- One consumer grade router in place between us and the cable modem: Asus RT-AC66U.
Without QoS enabled the phones work "ok", but when the network gets busy, call quality degrades. Enabling QoS seems to be the obvious solution. That's where the problem comes up.
I've enabled QoS on this router to give highest priority to destination TCP and UDP ports in the range of 10000 - 20000 and 5000 - 8999. These were the ports given to me by our voip provider as the ones to prioritize. No other traffic gets this level of priority in the QoS setup.
With this enabled, the voip quality is much worse. It's now significantly more sensitive to other network traffic. I'm at a loss. Can someone shed some light on what is going on here?
QoS settings below...