For those of you who always thought NDI would be a great way to do intercom, the wait is over.
Last week, Sienna shipped their new Intercom app for iPhone, which is 100% NDI Native.http://www.sienna-tv.com/ndi/ndintercom.html
This app can listen to any NDI source on your network (not just another intercom handset), and it sends another NDI stream with push-to-talk. Works on WIFI, Wired, and many VPNs over 4G.
The app can be used point to point, one to many and in other ways without requiring any special server. Its available to purchase in the iOS App Store today.
However, If you want something even more flexible, Sienna now has an intercom party-line server module for the NDI Processing Engine
which supports the iPhone app (and other sources including DANTE beltpacks).