hissing sound on panasonic cordless phone using VOIP(Lingo) and Comcast?

I have comcast internet, I then have my wirelss router and then I have my buzz adaptor connected to my router and then a new pansonic Dect 6.0 cordless buzz attached. This buzz is excellent but constant hissing sound which makes it hard. Any thoughts? It was not happening on my older 900mhz cordless buzz.

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