Paging Extension Number

We are currently running an analog phone paging system. Our users dial 77 from their Polycom phones and RingCentral desktop app, then announce the page after the beep. This is done over speakers on our factory floor. We want to terminate the analog line and move paging to RingCentral using a Cyber Data SIP Paging Adapter. If we do this, can we continue to use 77 as the extension for paging the same way as we currently do?