Small-Business Phone Systems Explained: Landline, VoIP or Cloud Number?
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How we wrote this: A guide based on Federal Communications Commission (FCC) consumer guidance and rules (linked below). We have not tested any phone provider. This isn't legal advice; confirm obligations for your setup with your provider.
Choosing a business phone setup used to mean leasing a box in a closet. Today most small businesses pick between three options, and the right one depends on how many people answer calls, where they work, and how much you care about calls during outages.
The three common options
| Option | How it works | Good fit | Watch out for |
|---|---|---|---|
| Traditional landline | Copper or carrier line to a desk phone | Single location; you want a line that's simple and familiar | Fewer features; often more expensive per line |
| Interconnected VoIP | Calls travel over your internet connection but can reach normal phone numbers | Small offices that want features like call routing, voicemail-to-email and extensions | Depends on internet and power; 911 location must be kept current |
| Cloud or virtual number | A business number that rings apps on mobiles and laptops | Owner-operators, remote teams, field service | Personal devices mix with work calls; check how 911 calls are handled |
911 rules for VoIP
The FCC's VoIP and 911 guide is worth reading before you switch. Key points:
- Interconnected VoIP providers must provide 911 automatically. Customers can't opt out.
- Providers must get your physical location before activation and give you an easy way to update it. If your registered address is wrong, emergency services may be sent to the wrong place.
- VoIP may not work during a power outage or when your internet fails. The FCC suggests considering a backup power supply, a traditional line, or a mobile phone as a backup.
- Providers must make sure customers understand any limitations, including warning labels to place near equipment.
Practical step: add "check our registered 911 address" to your moving and remodelling checklists, and to the setup of every new location.
Multi-line systems: Kari's Law and dispatchable location
If you have a multi-line telephone system (MLTS), the kind with extensions found in offices and hotels, the FCC's MLTS 911 requirements apply to systems installed or first sold after February 16, 2020:
- Direct dialing. Users must be able to dial 911 without a prefix such as "9". The rule is named after Kari Hunt; her daughter couldn't reach 911 from a motel phone that required dialing 9 first.
- Notification. Where the system can do it, a 911 call should notify a central point, such as a front desk, security screen or administrator's phone, so someone can guide responders in.
- Dispatchable location. 911 calls must carry a validated street address plus details like the suite or floor. That information must be automatic for fixed desk phones. Other devices have their own rules.
If a vendor configures your system, ask them to confirm all three in writing.
Questions to ask any provider
- How is my 911 address registered, and how do I update it?
- What happens to calls during an internet or power outage? Can they forward to a mobile?
- Can I port my existing number in, and out again later?
- Is call recording available, and how do callers get notified? (See our guide to call recording consent.)
- Is business texting supported and registered? (See 10DLC explained.)
- What does it cost per line, and what's included?
When nobody can pick up
The phone system is only half of it. Decide what happens to calls you can't answer: voicemail, a human answering service, or an AI receptionist. Our guide to handling after-hours and missed calls walks through the trade-offs. Autonomous Receptionist keeps a pricing index of AI receptionist services if you want to compare costs.