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how do I get my IP phone to work

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how do I get my IP phone to work

Hi! My boss sent me a Cisco IP Phone 7960 so I can work remotely. I plugged it into my router... I can make it ring and it can ring out but no voice can be heard and it lacks dial tone.  I took some time to set Inbound Filter Rules to open up these ports to their US IP adresses, but still no go. What am I doing wrong? Will this ever work on an ordinary Comcast Xfinity plan, or must I pony up for Voice?Screen Shot 2017-03-20 at 7.21.17 PM.png

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