We have an Avaya IP500 running on R5(18)with an IP endpoint license(1) for the Polycom Soundstation 7000. I have followed the directions from Avaya to install the Soundstation but it will not register with the Avaya IP500. We have static IP's for all phones and for the Soundstation. I can ping it through the Avaya system but It will not register? What am I missing? Any info would be helpful.