Business VoIP vs. landline
Short answer: for nearly every business, VoIP costs less, does more, and moves with you. The honest exceptions are sites with genuinely unreliable internet, and specific safety lines — elevator phones, fire alarm communicators, some alarm devices — that have code requirements and often need copper or a specifically approved replacement.
What actually differs
| Business VoIP | Traditional landline | |
|---|---|---|
| Cost | Per-user monthly; features usually included | Per-line, plus long distance and per-feature charges |
| Power outage | Needs internet and power; fails over to mobile apps | Copper often keeps working — a real advantage |
| Remote & hybrid work | Same extension on desk phone, laptop, or mobile | Tied to the physical desk |
| Features | Auto-attendant, voicemail-to-email, routing, analytics | Typically billed individually, if available at all |
| Adding a line | Configuration change, usually same day | Often a truck roll and physical wiring |
| Moving offices | Take the phones; numbers follow you | New install, possible number change |
| 911 compliance | Dispatchable location configured per FCC rules | Location tied to the physical line |
| Long-term availability | Actively developed | Carriers are retiring copper in many areas |
Lines that shouldn't just be switched
We sell VoIP — and we'll still tell you that some lines need care before they move. These carry code requirements and often need to work when the power doesn't:
- • Elevator emergency phones — governed by elevator code and inspected
- • Fire alarm communicators — subject to fire code and the authority having jurisdiction
- • Security and medical alert devices — some won't work over VoIP at all
- • Fax, postage meters, and legacy equipment — often workable, but test first
Confirm with your elevator vendor, alarm company, and fire marshal before disconnecting any of these. Discovering it during an inspection is the expensive way to find out.
Your phone system has legal 911 obligations
Under FCC rules implementing Kari's Law and Section 506 of RAY BAUM'S Act, multi-line phone systems installed on or after February 17, 2020 must:
- • Allow direct 911 dialing — no "dial 9 first"
- • Notify a designated person or location when 911 is dialed, where the system supports it
- • Transmit a dispatchable location — street address plus floor or room
This applies to the system, VoIP or not. It's worth explicitly confirming your provider configures it rather than assuming — a wrong address sends responders to the wrong building.
What happens to VoIP phones when the internet goes down?
This is the legitimate objection to VoIP, and the answer is failover rather than denial. Calls route automatically to mobile apps or backup numbers during an outage, so calls still reach your team — but it has to be configured deliberately before you need it. A traditional copper line does keep working in a power cut, which is a genuine advantage worth acknowledging.
Can I keep my existing business phone number?
Yes. Number porting moves your existing numbers to the new system, and customers notice nothing. Porting takes some lead time, so it's scheduled rather than done the same afternoon — keep the old service active until the port completes.
Are there lines that can't move to VoIP?
Yes — and any provider who tells you otherwise is overselling. Elevator emergency phones, fire alarm communicators, and some medical alert and security devices have code requirements and often depend on a line that works during a power outage. These either stay on copper or move to a specifically approved alternative. Confirm with your elevator vendor, alarm company, and fire marshal before disconnecting anything.
Does a business phone system have legal 911 requirements?
Yes. Under FCC rules implementing Kari's Law and Section 506 of RAY BAUM'S Act, multi-line telephone systems installed on or after February 17, 2020 must allow dialing 911 directly with no prefix such as 9, must notify a designated person or location when 911 is dialed where the system supports it, and must transmit a dispatchable location — the street address plus floor or room information. This applies to the system regardless of whether it's VoIP or traditional, and it's worth confirming your provider actually configures it.
Is VoIP cheaper than a landline?
Generally yes, particularly once you count the per-line charges, long distance, and add-on feature fees typical of traditional service. The larger saving is usually in what stops being a separate purchase — auto-attendant, voicemail-to-email, mobile apps, and call routing are ordinarily included rather than billed individually.
Thinking about making the switch?
We'll inventory your existing lines — including the ones that need to stay put — and map out what moving actually looks like.