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VoIP poor sound quality

We are using phone booth with t28 yea link phones. I have Comcast with 4 different yea link phones. All computer and phones are on same linkage srv4000 router. We have a clicking on the line and word clipping. I have taken the phone and plugged it directly right into the Comcast router and there was still a problem. I took the phone to my home with fios and did not experiience clicking and word clipping. I have heard about qos. Any suggestions.
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Lance_P

VOIP quality is based on the bandwitdh provided and routing. (Shortest route to the VOIP provider)

You could also enable QOS for Voice on the router, firewall or any other device you might have.

We know that the phones are not a problem since they work at home.

So it has to be the router settings or the bandwidth. If it is being shared, test the phones without anyone else using the line.
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jfaubiontx
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Word clipping will be caused by packet loss. The first thing to do would be to try the phone in the office where it is the only thing using the internet connection (by unplugging the other connections to the router) and see how that affects quality. If its much better then implementing QOS on the router may help as in this case the most likely cause would have been your internet connection maxing out its bandwidth.
If it doesnt help then it is most likely your internet service provider dropping packets because either there is a fault on their network or they network is too busy. Try running a ping test across the network (the windows program winmtr is very good for this) and raise a support ticket with your isp complaining about packet loss and attach the ping results. If they cant help then switch to a better isp.
Try testing it with one of the links below. On the first one try to chose a location close to your provider. This should help you find out why the quality is not there.

VisualWare
Voip Speed Test