We have an SX20 that will connect to our Polycom DMA vMR just fine, but our EX90 will not. Settings are the same on both units as far as we can tell. We can connect to our Codian and make calls to IP's on our network with no issue. Not sure where to start other than trying it from another location to make sure it isn't a firewall or other Data related issue with that particular location.
