Choosing a voice for your phone line

Most people choose the wrong way round

They open the list, play ten seconds of each voice through good speakers in a quiet room, and pick the one they'd like to listen to. It's a perfectly reasonable thing to do, and it tests for the wrong thing.

Nobody will hear this voice in a quiet room. They'll hear it on a mobile pressed to one ear in a van, or on a shop phone with the radio on, or on speaker with a dog barking. And they won't be listening to it like a podcast. They'll be talking to it, which means talking over it. So the two questions that matter are these: what happens when a caller interrupts, and how clear is the voice on an actual phone?

Those two questions are, more or less, the two sets of voices.

38 voices, two sets

A CosVoice line has 38 voices to choose from, in two sets: the new ones and the classic ones. The difference isn't mainly about who sounds nicer. It's about how they behave in a conversation.

New voices can be interrupted. Talk over one and it stops and listens, the way a person does. They sound more natural. The cost is that they take about a second longer to answer, and on some phone lines they're a little less crisp.

Classic voices are the clearest on a phone line and the quickest to answer, usually under a second. But they finish the sentence before they listen. A caller who cuts in has to wait for a pause.

When a new voice is the right choice

When the calls are conversations. If your line rings restaurants, chats to contractors, or takes calls from people who think out loud ("it's the, hang on, the back door, no, the side gate"), the caller is going to interrupt. People do. A voice that plows on to the end of its sentence while someone is trying to correct it feels like a machine. One that stops and listens feels like it's paying attention.

That extra second before it answers is real, but in a back-and-forth it reads as someone thinking. For a personal line, or any line where the calls wander, we'd start with a new voice.

When a classic voice is the better pick

When clarity and speed matter more than flow. A busy front desk is the obvious case. Callers want the hours, or a price, or to leave their details and get on with the day. The answers are short, so there's less to interrupt, and a quick, crisp reply is worth more than a natural pause.

Think about who's calling as well. If a lot of your callers ring from job sites or cars, or are older and a bit hard of hearing, the clearest voice wins.

Match the voice to the name

This one sounds too obvious to say. We're saying it because it gets missed. The line introduces itself by name on every call. If the name is Lloyd and the voice makes callers picture someone else entirely, they notice, and for the first few seconds they're thinking about that and not about why they rang.

So choose the name and the voice together. If you've already named the line, filter the voices in your head by that name before you press play on anything. If you fall for a voice that doesn't fit, change the name. That's in Settings too.

The same goes for a business. A line named after a company that fits gutters can sound different from one that answers for a wedding photographer. Neither needs to sound like a radio advert. Pick the voice you'd hire to answer your phone.

Test on a real call, not a preview

Every voice has a play button, and that's the right way to get from 38 down to three. After that, stop previewing and start calling.

• Use "Hear it". It calls your mobile so you hear the voice on a phone. Take the call wherever your callers will be. If that's a truck, go and sit in the truck.
• Ring the line and interrupt it. Cut in halfway through a sentence. Change your mind mid-request. See how it copes.
• Get someone else to ring it. Pick someone who'll be honest, don't tell them what to listen for, and ask afterwards what they noticed.
• Try it on speaker. Plenty of callers will have you on speaker, and a voice that's fine against the ear can turn to mush across a kitchen.

The settings that sit around the voice

A voice isn't only a voice. A few other settings change how it comes across, and they live in Settings, under Voice.

Speaking pace. If callers keep asking the line to repeat itself, slow it down a touch before you change the voice. Pronunciations. You can teach the line up to 20 words to say your way. Your surname, your street, the name of the business, that one supplier. The greeting. The first thing callers hear, so it's most of the first impression. Rings before it answers. Picking up instantly can feel abrupt. A ring or two feels more like a desk with a person at it.

Give it a week of real calls before you fiddle. The transcripts will show you where callers asked it to say something again, and that tells you more than any preview.

You're allowed to change your mind

Nothing here is permanent. Switching voice takes one click, and it applies to the next call. Nothing needs re-recording or setting up again. If you're torn between two, run one for a week and the other the week after.

If you'd like to hear how a call sounds before you have a line of your own, our number is answered by an AI agent called Lilly, on (949) 368-9902. There are full recordings on the demo page, and the FAQ has our short answer on which set to choose. Whichever voice you land on, the line says it's an AI whenever a caller asks.

Common questions

More on setup guides

• Conditional call forwarding, explained without the jargon
• Set up an AI phone agent in ten minutes
• Connect Claude to a phone line
• Get ChatGPT to make a phone call