I have a customer with a SpectrLink Link 150. They have an SCD 508, and an SCD 516. The 508 is the master, and has been recently having connectivity problems with the wireless bases around the building. Supplier said go onto Polycom site and download software update/grade, and should resolve prolem. He beleives it is because newer phones have been introduced to system, and this will fix. I went on their site and found no upgrade for the Link 150? Any help would be appreciated.