Moving Your Office to VoIP: A Migration Checklist for Small Businesses

What Must Your Network Handle Before You Switch?

How much bandwidth do you need?

Each active VoIP call uses a predictable amount of bandwidth in each direction, roughly 100 Kbps for a standard call, and the figure varies with the audio codec. Multiply by the number of simultaneous calls at peak, then add headroom for everything else on the connection. Calculate for peak hours, not average usage.

Will your current internet connection hold?

Run a speed test during business hours with the office at normal load. Look at upload speed as closely as download, because voice traffic depends on it. Ask your provider about latency and jitter, not just the advertised speed. A connection that is fast but unstable will still produce choppy calls.

Does the router prioritize voice?

Quality of service settings give voice traffic priority over file transfers and streaming. Confirm that the router supports this, and configure it before go-live. Without it, a large backup can degrade every call in the office.

Is there backup power and a backup connection?

VoIP phones lose service when the network or power fails, unlike a traditional landline that often keeps working. Plan for uninterrupted power on the router, switch, and phones. Decide how staff will take calls during an outage, such as failover to mobile phones or to a second line.

What Does the Phone System Migration Involve?

How do you port existing numbers?

Number porting moves your existing phone numbers from the current carrier to the new provider. The process requires account details that match your carrier records exactly, and it can take several weeks. Start the port early. Keep the old service active until the port completes, or your numbers can go dead during the transfer.

Which devices and lines need attention?

Inventory every line: desk phones, conference phones, fax machines, alarm and monitoring systems, elevator phones, and door intercoms. Some of these work poorly over VoIP or need a separate analog adapter. Test each one before cutover, not after.

How do you configure call flows?

Map the business logic before you configure the system: auto-attendant menus, hunt groups, after-hours routing, voicemail, and call forwarding. Build it as a document your team can read, then configure and test it. Most go-live problems come from call flows that worked in the old system but were never written down.

What about emergency calling?

For VoIP service, emergency calling depends on the address registered for each phone. Register the correct address for every location and every device that moves. Confirm the registration in writing with your provider before go-live. Treat this as a legal and safety requirement, not an admin task.

What Should the Cutover Plan Cover?

When should the switch happen?

Choose a low-volume window, typically after hours or on a day with few client calls. Avoid month-end, tax deadlines, and launch dates. Schedule the cutover only after the number port is confirmed complete.

What is the rollback plan?

Define the exact steps to return to the old system if the new one fails. Keep the old service active during the first weeks where possible. Name who makes the rollback decision, and the conditions that trigger it.

Who is trained, and when?

Train staff on the new phones and call flows before cutover, not on the day. Provide a one-page reference for the most common tasks, such as transferring a call, checking voicemail, and forwarding to mobile.

How do you measure success?

Track dropped calls, call quality complaints, missed calls, and voicemail delivery for the first thirty days. Review the data weekly. Small problems found in week one are cheap to fix. The same problems found in month three have cost you clients.

FAQ

Do we need new phones to switch to VoIP?

Not always. Many desk phones work with VoIP through configuration, though some older models will not. Check compatibility with your provider before buying hardware.

How long does a migration take?

Porting numbers is usually the longest step and depends on the carrier. Plan several weeks from start to cutover for a typical small office, and longer if you have many lines or special devices.

Is VoIP cheaper than a landline?

It often costs less per line, but the total depends on the internet connection, hardware, and support you need. Compare full monthly costs, including any connection upgrades required to run voice reliably.

Conclusion

A VoIP move succeeds when the network is tested, the number port is planned early, every line is accounted for, and the cutover has a rollback. Skip one of these and the cost shows up as dropped calls and missed clients. SPARK Services can assess your network and plan the migration with you. Contact us to start.