Choosing a Business Phone System for a Small Office

What features do small offices actually need?

Reliable calling, voicemail, a mobile app, and basic call routing. That covers the vast majority of what a 5 to 30 person office uses daily.

A small law firm needs calls to reach the right attorney or go to voicemail with a professional greeting. Law firms handling sensitive client matters should also confirm call recording storage meets their state bar's data retention requirements. A non-profit needs staff reachable whether they're at a desk or in the field. Neither needs a contact center platform or AI-powered analytics.

Auto-attendants help: they let callers route themselves without a dedicated receptionist. Call recording matters for client-facing practices. Video conferencing is often bundled, but if your team already uses Zoom or Teams, you're paying for overlap.

Upgrading to a mid-tier plan for features you may never use can add $15 to $20 per user per month. Start with the basic tier and upgrade if you actually need something.

How many lines does a small business need?

One line per employee who makes or receives calls — not one line per desk. Cloud phone systems don't work like traditional lines. Each user gets their own number and extension.

A 10-person law office where 8 attorneys and staff take client calls needs 8 lines. The two people who only use email don't need a phone line at all. A non-profit with 15 employees but only 6 who handle external calls can run on 6 lines plus a main office number.

Shared lines and call groups handle overflow. If your front desk is busy, calls can ring to a group or roll to voicemail. You don't need extra lines sitting idle for peak volume.

Most providers charge per user. Eliminating lines you don't need is the simplest way to cut costs. Before you sign, it's worth a quick look at who on your team actually uses the phone — that's often enough to trim your line count and your bill.

What's a realistic budget for a 10-person office?

Most small offices pay $15 to $35 per user per month for a standard cloud phone plan — the upper end of the market includes enterprise features most small teams don't need. A 10-person team should expect $200 to $400 monthly with annual billing.

The low end covers calling, voicemail, mobile apps, and basic routing. The high end adds call recording, CRM integrations, and advanced features. Most small law firms and non-profits don't need the high end.

Switching from a legacy phone system to cloud VoIP often cuts costs significantly. The actual savings depend on your current setup, but the first-year cost for a small team is typically well under what a traditional hardware installation would run — with lower ongoing costs after that.

Hardware is optional. Softphone apps on computers and mobile devices work for most teams. If you want physical desk phones, budget $80 to $150 per unit. A hybrid approach — desk phones for reception, apps for everyone else — often makes the most sense.

Most setups are operational within a few weeks. Cloud providers handle number porting, and your team can be trained on the new system before it goes live. An advisor can identify which providers are built for small office accounts and which offer the features you need without enterprise pricing.