Which would mean they're at the base using Vonage's services, which I think Vonage bought Tokbox. I still believe that they're probably using Agora thru UDP as

Which would mean they're at the base using Vonage's services, which I think Vonage bought Tokbox. I still believe that they're probably using Agora thru UDP as someone else mentioned, but I don't know enough networking to really know what that means.