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At a glance
- Ooma Office Essentials: $19.95/user/month; Pro: $24.95 (desktop calling, recording, 25-person video).
- VoIP depends on local internet and powered equipment; plan backup for calls that matter.
- Analog lines vary by address; there is no universal published rate.
- Checked September 27, 2026.
Cloud VoIP vs a traditional analog landline
Swipe or scroll sideways to compare all options.
| What changes | Cloud VoIP: Ooma Office Essentials example | Traditional analog/POTS line |
|---|---|---|
| Price basis | $19.95/user/month, plus taxes and fees | Address-specific carrier quote; no universal published rate |
| Call path | Internet connection | Carrier-provided analog telephone circuit |
| Business routing | Virtual receptionist and extension features in the plan | A basic line does not supply a cloud phone system; PBX or separate services may be needed |
| Mobile working | Ooma mobile app | Usually tied to the line or forwarding arrangement |
| Computer calling | Essentials desktop app does not include calling; Pro is $24.95/user/month | Requires separate equipment or service |
| Outage dependency | Local internet, powered network equipment and endpoint | A genuine line-powered copper service differs from fiber/cable voice; cordless phones still need power |
| Existing analog equipment | Adapter or supported replacement may be required | Native analog connection, subject to the device and carrier service |
| Expansion | Add users and supported endpoints | Add circuits, ports or PBX capacity as applicable |
| Main limitation / extra cost | Internet and powered network equipment are required; Essentials lacks desktop calling | Line price does not establish a complete PBX, mobile app or remote-working system |
| Best fit (Sigma assessment) | Staff need extensions and mobile calling over a suitable internet connection | An existing analog device requires a carrier-supported analog service |
| Official sources | Ooma: Small business phone plans | AT&T: Phone for Business |
Source: Ooma’s plan matrix and AT&T’s description of its business phone service. AT&T Phone for Business uses IP technology; it should not be labeled traditional copper merely because it supplies a fixed business number.
The monthly price is only one part of the decision
Five Ooma Essentials users total $99.75 a month in service before taxes and fees. Five Pro users total $124.75. The extra $25 buys a higher service tier, including computer calling and recording capabilities, rather than five new physical telephone lines.
A landline comparison needs the number of simultaneous calls the business must handle and the equipment already installed. Five employees do not necessarily require five analog lines, just as one main telephone number does not necessarily mean only one cloud user. Compare the working call flow, not an arbitrary equal count of subscriptions.
For a small reception office, the required workflow might be one public number, a greeting, two people who can answer and an after-hours destination. For a service business, it might also include employees taking business calls from mobile devices. Those are materially different purchases even if both owners ask for a “business phone.”
Where VoIP is the stronger fit
Cloud calling is worth shortlisting when calls need to follow employees, several locations must share a phone system, or the business wants routing that an ordinary line cannot provide alone. Moving those functions into a subscription can reduce the number of separate products to administer.
However, the base subscription does not automatically contain every advertised feature. Ooma’s Essentials-versus-Pro computer-calling distinction is a useful example. If the plan is intended to replace desk phones with headsets and laptops, buying the wrong tier defeats the purpose.
Where the existing line needs special treatment
Inventory fax machines, alarms, entry systems, payment devices and other equipment connected to the current line. A telephone adapter is not proof that a device’s signaling will work properly. Have the equipment vendor and service provider confirm support for the proposed replacement.
This is especially important where the line supports a safety-related or monitored system. Treat that as a separate technical scope rather than including it casually in an office-phone order. The ordinary voice plan comparison cannot establish that a particular alarm or emergency device will work.
Reliability: compare the whole call path
A cloud provider’s availability claim does not keep your office router powered or repair a failed local internet connection. If incoming calls are important to sales or service, include the local network, power backup and alternate call destination in the design.
For a site with backup internet, test what happens during an actual change of connection. The desired outcome may be accepting the next incoming call on a mobile app, not preserving every call already in progress. Decide which outcome the business requires and verify it with the selected equipment.
Likewise, do not assume every fixed line survives a power outage. An IP-based service delivered through a modem or fiber terminal has different local power dependencies from traditional line-powered copper. Ask what is installed at the location and where the backup power comes from.
A practical buying decision
Choose cloud VoIP when its named plan delivers the needed routing, applications and mobility at an acceptable complete cost. Keep or replace a specialized line according to the connected device’s confirmed requirements. A business can use cloud phones for employees and a separately designed solution for a legacy device.
Before transferring the public number, test the greeting, transfers, voicemail, outgoing caller ID and after-hours behavior using temporary numbers where possible. Assign responsibility for emergency-address configuration and employee training. Then plan the transfer with a fallback contact route so customers can still reach the business if an activation issue occurs.
Questions to ask before you buy
- Which devices use our current lines (fax, alarm, elevator, gate, payment terminals)?
- How many calls must we handle at the same time?
- What happens to incoming calls during an internet or power outage?
- Which plan tier includes desktop calling and recording, if we need them?
- Who configures E911 addresses for each user and location?
What Hawaiʻi businesses should check
Before moving numbers, list every device on the current lines: fax, alarms, elevator phones, gate entry and payment terminals. Some Hawaiʻi properties still rely on these, and each needs confirmed support before the old line is disconnected. For extended power outages, decide how calls will reach staff, for example by forwarding to mobile apps.
Frequently asked questions
Is a fixed phone number proof that service is a landline?
No. Cloud and IP services can use ordinary local telephone numbers.
Will VoIP always save money?
No. Include user licenses, equipment, installation, network changes and required options. It should deliver a better complete solution for the particular office.
Is VoIP cheaper than a landline for a small business?
Often, once you count the features you would otherwise buy separately, but not always. Compare user licenses, phones, internet capacity, backup and any lines you must keep for devices.
Sources and pricing notes
Prices and specifications checked September 27, 2026 against the providers’ published sources below. Prices are US list or published rates before taxes, fees and equipment unless stated; offers change, so confirm the current terms before you buy.
- Ooma. Small business phone plans
- AT&T. Phone for Business
How Sigma is paid. Sigma is a Hawaiʻi technology advisor. Provider or reseller partners compensate Sigma; product and service prices may include a margin. No procurement fee applies. Standalone consulting is quoted separately.