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Speak to the VoIP provider and see what ports need opening on your router, try putting the IP address of the phone into the DMZ of the router too and see if that helps.

Trust me, you will be able to plug a VOIP phone in - you may need to add the end point to allowed sites in the firewall but your provider should be able to advise you. Regarding experience with VOIP, I work for one of the largest pure cloud communications companies in the world and have 14...