This is a small intercom system which can have comm stations on any platform: iPhone, Mac, PC, Android, iPad. Maximum size is 6 PL channels and 58 Users. The PL channels can be interfaced to you own PL system with a 4-wire port for each of the 6 PL channels.
You can rent Unity intercom with their server in the cloud or buy the server and ports. In the future they may also offer rental ports with your purchased server.
A purchase discount is available from http://www.dcscomms.tv/
I am demoing it until Feb 16 and have talked to users in as far away as Germany and Australia with no noticeable latency. I have been told that networks are using it on TV trucks for supplemental comms on Superbowl 50 as well as initial setup comms. If you want to demo it, download the client (no charge). This is permanently on my server thanks to the kind folks at Unity. I am not always on so download it to a friend too.