We have an R9 server edition and can get the ONE X Mobile client registering outside of the LAN but the voip option doesn't work. We have an external DNS entry pointed to a spare eternal IP address we have and this in turn forwards/open ports to our server edition. The External DNS is for example Comms.name.communications.co.uk. The ONE X XMPP settings is populated with this address. On the server, Platform/settings/system the host name is set to the internal ip address of the server. DO we need a matching internal/external DNS entry or can anyone advise which bits are missing/incorrect in the set up here?