AI Voice Agent Development Company
We build voice agents that answer your phone line, hold a real conversation, and write the outcome straight into your systems — then hand the call to a person the moment it needs one. No menu trees. No per-minute reseller margin.
24/7
Call coverage, no rota
<800ms
Target response latency
90%
Less manual call entry
4.7★
Average client rating
The Agent
What an AI voice agent actually does
It picks up the phone. It transcribes the caller as they speak, works out what they want, asks only for the details still missing, performs the action in your systems, and confirms it back — all inside the call.
Voice is a harder problem than chat, and the difference is timing. Everything in the pipeline has to stream, or the agent sounds broken by the second exchange.
Inbound call · connected
+1 (604) ••• 2210 · no queue, no menu
01Picks up
Answers on the first ring — any hour, any number of calls at once.
02Transcribes
Speech to text streams while the caller is still talking, not after silence.
03Understands
Resolves the intent and works out which details are still missing.
04Asks the gap
Requests only what it does not already have. Nothing gets asked twice.
05Acts, then confirms
Writes to your system mid-call and reads the result back to the caller.
No scrollback
A caller cannot re-read a detail they missed, so the agent has to hold context and repeat it back unprompted.
No typing indicator
Chat excuses a pause. On a call, two seconds of silence reads as a dropped line — timing is the whole product.
Constant interruption
People talk over each other. Barge-in has to cut the agent off mid-word the way a person would stop talking.
Build time
10–14 weeks
Team
3–4 engineers
Telephony
Twilio, SIP, or your PBX
Languages
Multilingual from day one
Handoff
Warm transfer to a human
Four ways calls cost you revenue
Calls after hours go unanswered
Roughly half of inbound calls to service businesses arrive outside staffed hours. A voicemail box is not a safety net — most callers hang up and dial the next number on the search results page.
Someone re-types every conversation
A booking is taken by phone, then keyed into a sheet, a CRM, or a dispatch board. The transcription step adds delay and introduces exactly the errors that cause a missed pickup or a double booking.
Robotic IVR menus make it worse
Press-one-for-sales trees were tolerated because there was no alternative. Callers now abandon them at high rates, and the ones who stay arrive at your team already irritated.
Generic bots fail the hard calls
An off-the-shelf voice bot handles the easy 60% and then dead-ends. Without a clean escalation path the caller repeats everything to a human, which is worse than never automating at all.
The Pipeline
What happens in the 800 milliseconds between turns
Six stages, all streaming. Any one of them running batch-style instead of continuously is enough to make the whole agent sound wrong.
Call arrives
Inbound through Twilio, a SIP trunk, or your existing PBX. Number, time, and any CRM match are resolved before the agent speaks a word.
Speech to text, streaming
Audio transcribes continuously rather than waiting for silence. That streaming step is what makes the agent feel responsive instead of walkie-talkie.
Intent and slot filling
The model works out what the caller wants and which details are still missing — date, address, service, account — then asks only for those.
Response synthesis
Text to speech with a consistent voice, streamed as it generates. Barge-in is handled, so a caller interrupting stops the agent mid-sentence like a person would.
Action and write-back
Booking created, record updated, ticket raised — written to your CRM, calendar, or ops sheet during the call, not queued for later.
Handoff when needed
Ambiguity, high value, or an explicit request routes to a human with the transcript and collected details already on screen.
Capabilities
What we put on your phone line
Platform vs Custom
Off-the-shelf voice bots vs a built agent
How We Work
From recorded calls to live traffic
Listen to real calls
We review recordings and transcripts from your actual inbound traffic. Scripts written from imagination fail on contact with real callers.
Design the conversation
Intents, required fields, escalation triggers, and failure paths get mapped — including what the agent does when it does not understand.
Build and tune
Telephony, speech pipeline, and integrations are built together, then tuned against recorded calls until latency and accuracy hold up.
Shadow, then switch
The agent runs on a subset of calls first, with humans reviewing transcripts daily. Volume increases only as the numbers justify it.
Why Ethersofts
Why teams trust us with the phone line
Latency is the whole game
Streaming at every stage of the pipeline. A voice agent that pauses for two seconds gets hung up on, no matter how good the answer was.
Handoff designed first
We map escalation before happy paths, because the calls that go wrong are the ones that damage your reputation.
Multilingual without a second build
One agent handling several languages, switching to whatever the caller uses, rather than a separate number per language.
Write-back that actually lands
Structured data into your CRM, calendar, or sheet during the call, with validation so bad input is caught while the caller is still on the line.
Recording and consent handled
Disclosure, consent capture, retention windows, and redaction of sensitive fields built to your jurisdiction’s rules.
You own the prompts
Full source, prompt library, and provider accounts in your name. Swap speech or model vendors later without rebuilding.
“We needed a HIPAA-compliant telehealth platform fast — video visits, e-prescriptions, EHR sync over HL7 FHIR. Ethersofts shipped it in 11 weeks, passed our security audit on the first pass, and onboarded 4,000 patients in month one.”
Dr. Anita Rao
Chief Medical Officer · CareBridge Health · Toronto, Canada
AI voice agents, answered
If your question isn't here, ask it. You'll get a real answer from an engineer within 24 hours — not a sales pitch.
An AI voice agent answers and holds real phone conversations. It transcribes the caller in real time, works out what they want, asks for any missing details, takes the action — booking, updating a record, raising a ticket — and hands off to a human when it should. Unlike an IVR, the caller speaks naturally instead of navigating a menu.
Voice has constraints text does not. There is no scrollback, so the agent must hold context by memory; there is no typing indicator, so any pause reads as a failure; and callers interrupt. That means streaming speech recognition, barge-in handling, and sub-second response targets. A chatbot ported to a phone line sounds broken within two turns.
We target under 800 milliseconds from the caller finishing to the agent beginning to speak, which is roughly the pause length people expect in conversation. Hitting that requires streaming transcription, streaming synthesis, and keeping the model call on the critical path as short as possible.
It transfers to a human — warm, not blind. The person receiving the call gets the transcript and the details already collected, so the caller does not repeat themselves. Escalation triggers are configurable: explicit request, repeated misunderstanding, high-value account, detected frustration, or any topic you flag as human-only.
Twilio most often, but also Vonage, Telnyx, a direct SIP trunk, or an existing PBX such as Asterisk or FreeSWITCH. If you already have numbers and a carrier relationship, we build onto that rather than asking you to port everything.
Yes, and usually on the same number. The agent detects the language the caller is using and continues in it, including mid-call switches. This works far better than routing each language to a separate line, which callers rarely navigate correctly.
Ten to fourteen weeks for a production agent: telephony, speech pipeline, conversation design, integrations, escalation, and monitoring. A narrow single-intent agent — appointment booking only, for example — can be live in six. We shadow real calls before taking any live traffic.
You pay the underlying providers directly — telephony per minute, speech recognition, model inference, and text to speech. For most deployments that lands well under the cost of the equivalent staffed coverage. We do not resell those services or add a per-minute margin, and the accounts stay in your name.
Let's Put An Agent
On Your Phone Line
Send us a handful of recorded calls and we'll tell you honestly what can be automated and what should not be. Written scope within two working days.
