Device to connect Valcom V-2001a to RingCentral?

Hi, we have a super simple intercom setup that we've used for 10+ years. With our old Cisco phone system, we were able to have someone press the speaker button, which would then ring 4-5 phones, and whoever answered was able to speak with that person, then click the * key on the phone, which would allow the gate to open. Now we have RingCentral, and the proposed ATA-192 device doesn't work. Really need help finding a solution that allows our Valcom V-2001a to connect to an extension on RingCentral. Any advice would be greatly appreciated!!!