Well...they do support STUN, and can be manually configured with not a great deal of effort, using the GUI, if you are familiar with any other Sipura/Linksys/Cisco set/ATA with a similar menu. Would I use one or two, at a locally hosted site, if I already had them on hand, yes, (I like the fact they have Wifi built-in, and support bluetooth) but, I would not go out and purchase any new ones if supported sets were available. Especially, if you are not prepared to troubleshoot hem yourself.