Public Street Between 2 Sections Of An Access Control System - How To Handle?

We are looking at an access control system in new construction but the project is two sections with an existing public street between them.

System will be Door King 1837 callbox and we plan on using Ubiquiti to connect back to leasing office but not sure I want to rely on that for a Full time VOIP solution for the call box.

Do I just KISS and tell them to get a phone line on the other side?

I assume you can't cut open a street even if it is in the middle of a job site?

Thoughts?

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