if you just wanted a traditional talkback setup you can use audio busses ? if you want a wifi thing going to tablets or phones in theory it could be done using NDI but it would need a two way comms oriented app which i dont think currently exists.. maybe vmix team could make something ? it would be a handy tool and cool project for someone who can code.. if you want some help with the traditional audio intercom routing i can offer some tips for that..

if you have 4x crew (at the same physical location), take a mic input for each of them into vmix.. then route those 4 mic inputs to buss G... then in settings setup buss G to send to an output on your audio interface. then use a headphone splitter off that output to split and amplify the signal into 4 sends.. then each of the 4 crew members takes an output off the headphone splitter to their headphones. that is basically it..

so whenever anyone talks their mic goes into vmix and is routed to buss G which all 4 people hear because buss G goes out to the headphone splitter and on to each persons headphones.. if you want other audio to be heard by the crew also just route whatever you like to buss G.. also if you use headsets that have a mute option for the mics then you can leave them muted unless someone wants to speak.. that keeps background noise out of the talk back channel..

here is an example of a headphone splitter box..

https://www.sweetwater.c...4-ch-headphone-amplifier


EDIT: forgot to mention.. also turn off the talk back mics in the master buss(or whichever buss is sent to the stream) so crew conversation stays in the talk back channel..

I'm using a simple cheap tour guide system so my presenters can hear me chatting to them without the public knowing. not sure if that's any good to you.

https://forums.vmix.com/...0-Sound--Sound-and-Sound

Birddog offers an intercom solution with their NDI products.
Another seperate option (no matter where you are on the planet as long as you have internet) is the usage of Talki Walki Apps ona mobile device. There is Zello, just to name one. You can create groups where you can organize the members of the production. Totally free.

the busses which are already there is the traditional way of doing an intercom.. the only other way i could see vmix adding something different would be to write an app for phone/tablet and use wifi..

you could add a dedicated intercom buss that routed audio via wifi to phones/tablets.. the app would also need to send audio back to allow for crew mics, which would mean adding "intercom" as a new input device in vmix.. the app screen could have a big mute/unmute button to prevent ambient noise in the channels and you could probably use mix minus also..

for the most part this is mostly what vmix call already does anyway.. maybe it could be adapted to use as an intercom ? just remove the video, make it usable on a local network and write a dedicated app for the phone/tablet.. i imagine that would still be a fair undertaking but it would be useful..

I prefer to keep the vMix computer focused on the important issue of switching the show. My solution has always been for intercom to be completely separate and standalone. When things go wrong, it's nice to have another path of communications outside of the broken thing. To that end we have a RTS coms system locally for our shows. This ties into something like Unity or Discord for remote techs via another computer. There are also IFB ports available to feed vMix for return audio to guests as needed. It's extra hardware, but works very well.

+1