Can someone recommend a smart phone based intercom system?

[Michael Elfant]

Hi - I'm on the board of a 42 unit condo building and we are looking for a smart solution to our outdated, hard-wired, intercom system.  

We prefer to keep it app based so that we can utilize our smart phones as opposed to going through a costly fixed video intercom monitor in each unit. 

In terms of functionality, we want video, audio and fob entry and possibly a key pad as well for delivery men, etc.  

An example of a system that we've seen on the market is the DoorBird IP Video Door Station D21DKH.  

https://www.affordableopeners.com/doorbird-ip-vide...

This system fits our criteria but we haven't been able to find any reviews on it so we are a bit skeptical and want to compare it to other options.  

Please let me know if you guys have any ideas.  

Thanks,

Mike