Migrating 60 phone numbers to Aircall — and lifting answer rates past 90%

For a law firm, a missed call isn't a missed call. It's a worried client who didn't get an answer, or a potential case that goes to the firm down the street. Yet most firms can't even see the calls they miss — they're scattered across a phone system that was never built to show them.

We moved a firm's roughly sixty numbers onto Aircall, made every missed call visible, pushed the answer-rate SLA above 90%, and unified calling, texting, and AI summaries into one place. Here's the arc of that project — and where it's heading next with AI voice agents.

Start with visibility: you can't fix what you can't see

The firm's old setup spread calls across systems that didn't talk to each other. Nobody could reliably answer a basic question: how many calls are we missing, and who's missing them?

Step one was simply making that visible. Once calls ran through one platform, missed calls generated alerts and follow-up tasks instead of vanishing — a documented workflow where every unanswered call gets a follow-up assigned within a day. That single change reframed the phone from a black box into something you can manage, measure, and improve. Answer rates climbed past 90% not because people suddenly worked harder, but because the misses finally had somewhere to go.

Port carefully — don't drop a client mid-transition

Moving ~60 numbers is where consolidations go wrong if you rush. Clients are already calling the numbers in their welcome letters and email signatures; a botched port means a real person reaches a dead line at a bad moment.

So we ported deliberately and kept continuity through the change — forwarding numbers as needed during the transition until each team was trained and ready on the new platform, rather than flipping everything at once. The team got set up in the Aircall dashboard ahead of the port date, so when numbers moved, people were already prepared to take calls. Done this way, the cutover is invisible to clients: they keep reaching the same people.

Unify the conversation in one log

Once the calls lived in one place, we connected Aircall to HubSpot so every interaction — calls, SMS, and MMS — logs automatically against the client record. A case manager opens a contact and sees the whole conversation history in one timeline, no matter the channel.

Two details made this genuinely useful. First, AI call summaries mean someone picking up a matter doesn't have to listen to a recording — they read what happened. Second, we logged automated and outbound calls under a clear automation identity so the record owner stays accurate and the team isn't confused by calls that look like they came from a colleague. The result is context: every client touch, captured and attributed, in the system the team already uses.

Extend with AI voice agents (AIVA)

With the foundation clean, the firm is now layering AI voice agents on top — and this is where it gets interesting.

When a call goes unanswered, an AI agent picks up instead of sending the client to voicemail: it greets them, handles the basics, and logs the interaction so a human has a tracked follow-up. We're extending those agents beyond missed calls into outbound outreach — reaching leads to complete an intake — and case updates, where the agent can give a client a status update based on where their matter stands. The phone stops being a bottleneck and becomes another way the firm shows up for clients around the clock.

The sequence matters, though: none of this works bolted onto a tangle of disconnected numbers. Consolidate and unify first, then add intelligence.

What changed

Sixty-odd numbers became one managed platform. Missed calls became visible, then rare. Calls, texts, and summaries landed in a single client timeline. And the same clean foundation now supports AI agents that answer, follow up, and update clients. That's what a phone system looks like when it's built to serve clients instead of just connect them.

Why migrate a law firm's phones to Aircall?

To consolidate scattered numbers into one platform, make missed calls visible, and unify calls and texts into the CRM. The payoff is higher answer rates, better client follow-up, and a single conversation history per client.

How do you migrate dozens of phone numbers without missing calls?

Prepare the team in the new platform before the port date, forward numbers during the transition, and cut over team by team rather than all at once. Handled carefully, clients never notice the switch.

Can AI handle calls a firm misses?

Yes. AI voice agents can answer unanswered calls, complete intakes through outbound outreach, and provide case-status updates — turning missed calls into tracked follow-ups instead of lost clients.