Box Office - Intercoms

Hi folks, 

Arts Club is located in Vancouver, Canada.  We have 3 venues with box offices that serve walk-up and will-call traffic. 

Our intercom tech at each venue is different - but none are 100% reliable.  They vary in age from 30+ years to 3 years old. 

I have meetings in the next month with our Facilities Manager to negotiate investing in a permanent fix for all 3 venues.

Please provide any insight / reviews for the systems you are currently using to help me guide the conversation (pros and cons)

Cheers!

Andrea