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Article · Oct 29, 2026

VoIP vs. on-site PBX: what each really costs a small business

An on-site PBX means buying and maintaining hardware; cloud VoIP like Verizon One Talk swaps that for a monthly per-line cost. Here's how the costs compare and when each makes sense.

The short answer

For most small and mid-size businesses, a cloud phone system costs less over time than buying an on-site PBX, mainly because there is no hardware to buy, maintain or replace. An on-site PBX can still make sense for large sites with special call-handling needs or existing equipment with years of life left.

What you pay for with an on-site PBX

  • The PBX hardware and licenses up front
  • Desk phones that work with that system
  • Phone lines or SIP trunks from a carrier every month
  • Maintenance contracts, programming changes and eventual replacement
  • Battery backup, rack space and someone who knows how it works

What you pay for with cloud VoIP

  • A monthly cost per line or user
  • Desk phones, or no desk phones at all if staff use the mobile and desktop apps
  • A solid internet connection, ideally with a backup
  • Setup: number porting, call flows, auto attendant and hunt groups

Costs people forget

With a PBX, the hidden cost is the next upgrade and the vendor you depend on for every change. With cloud VoIP, the hidden cost is a weak network: poor Wi-Fi or a single internet connection can make calls choppy. That is why we look at the network and cabling during a phone project, not just the phones.

Where Verizon One Talk fits

One Talk puts your business number on desk phones, mobile phones and a desktop app, with an auto attendant and hunt groups managed online. As a Verizon partner, Strategix sets it up, ports your numbers and trains your staff. You do not have to be a Verizon customer today. See Verizon One Talk setup or ask for a quote.