Will our phone numbers change if we switch from landlines to VoIP?

No. Number portability is a legal right in the United States (local number portability) and across the EU, so you keep your existing published numbers when you move to VoIP. Porting is coordinated with the current carrier and typically completed in days to a few weeks, and the migration is planned so numbers cut over without downtime.

Do VoIP phones work during a power or internet outage?

Not on their own, which is the main planning difference from copper. A landline draws power from the phone line and stays up in an outage. VoIP needs power and connectivity, so a resilient deployment adds a UPS, a backup internet path, and automatic failover that routes calls to mobile apps or another site. Failover behavior and service levels are defined in your agreement.

Is business VoIP cheaper than traditional phone lines?

Businesses commonly see lower total voice spend because per-feature charges and multiple physical circuits collapse into one per-seat subscription with bundled calling. The saving depends on your line count, call volume, and current contracts, so the honest answer comes from comparing your actual bill against a per-seat quote rather than from a headline percentage.

Business VoIP vs. traditional landlines: what actually changes

TL;DRBusiness VoIP carries calls as data over your internet connection; traditional landlines ride the copper PSTN that carriers worldwide are now retiring. VoIP shifts phone systems from capital hardware to a per-seat subscription, makes numbers portable and location-independent, and bundles features that landlines charge extra for.

What is the actual difference between VoIP and a landline?

A traditional landline is a circuit-switched connection over the copper public switched telephone network (PSTN): one physical pair of wires per line, a dedicated circuit held open for the duration of every call. Business VoIP (Voice over Internet Protocol) converts speech into IP packets and sends them over your data network and the internet to a cloud phone system. The number stops being tied to a copper pair at one address and becomes a software identity that can ring a desk phone, a laptop, and a mobile app at once. That single architectural shift drives every practical difference below.

Why are carriers retiring traditional landlines?

The copper PSTN is being decommissioned worldwide, not as a vendor preference but as an infrastructure decision. In the United States the FCC has cleared carriers to retire aging copper and legacy TDM services; in the United Kingdom the national PSTN and ISDN switch-off is scheduled for January 2027; carriers across Europe have already moved most lines to all-IP. Maintaining a shrinking copper network is expensive, and new features are built for IP only. Businesses on landlines are increasingly running a platform their own carrier plans to stop supporting.

How does the cost model change?

Landlines are a capital-and-per-line model: on-premises PBX hardware, a copper pair or PRI circuit for each set of lines, and separate charges for features and long distance. VoIP is an operating-expense model: a per-seat subscription that typically bundles unlimited domestic calling, voicemail, and the full feature set, with SIP trunks or hosted seats provisioned in software rather than by installing wire. Businesses commonly see lower total voice spend after moving off copper, mainly because feature add-ons and multiple physical circuits collapse into one predictable line item. Run the comparison against your real line count before deciding.

What do you gain, and what do you have to plan for?

VoIP bundles what landlines meter: auto-attendant, voicemail-to-email, call routing, conferencing, presence, mobile and softphone apps, and analytics arrive as standard rather than as billable extras. Numbers move with you, which matters for continuity and for remote or multi-site teams. The trade you plan for is dependence on power and internet: a landline draws power from the phone line and keeps working in an outage, while VoIP needs a reliable connection, a UPS, and quality-of-service on your network. Emergency calling also requires a registered address; in the US, Kari’s Law and RAY BAUM’S Act mandate direct 911 dialing and a dispatchable location, which a managed deployment configures for you.

Which one fits your business?

If your calling is light, single-site, and your copper still works, a landline can keep running until your carrier forces the change. For almost everything else, VoIP is now the default: multiple locations, remote staff, growth, or simply not wanting to pay per feature. Number portability is a legal right in the US and EU, so switching does not cost you your published numbers. Triton VoIP, a Triton Technologies company, plans and runs the migration end to end: network readiness, number porting, and call flow, with support and service levels defined in your agreement. Triton Technologies has managed business infrastructure since 2001.