It is just voice messages automated. That's all. You push to talk, it records your voice message, then sends it to everyone in the channel (group chat). Everyone gets a notification and the message automatically plays on their end. It creates the semblance of radio comms, but everything is recorded and kept in a group chat history. It also depends on service data coverage, since it is just an internet app and that's all. Basic features like dispatcher mode, diffusion and complex multi-channel setups are paid under a premium subscription. They sell some hardware that interoperates with the app in a radio like fashion as well, but it is all third party, so quality varies a lot. Also, I'm not aware anyone has ever done a security audit on them, the thing is entirely proprietary and closed source, it tracks location as well, so I wouldn't necessarily trust it.
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You know this saying in ICT: Everyone has a development environment, a lucky few also have a separate production environment.
I witnessed it first hand on IBM, three in the morning, troubleshooting a database problem for a big client. Engineer writes up a script to try and solve the issue, I was the systems operator. Tells me to just run it on the mainframe.
“Wait, was this tested at all?”
“Client authorized it, they just want the downtime gone. Send it.”
So I just ran an untested script that fundamentally changed everything on the production database, written by a sleep deprived engineer that just wanted to go back to sleep. Granted, it worked, that one engineer was an old rockstar who had been with the client for over a decade. But the next three weeks were dedicated to tiptoeing around the changes of this one script and testing everything, in production, to make sure that the solution was viable long term and it didn't break anything unseen. We all knew better, but everyone agreed and did it anyways.