Voice AI
Retell automation and integration.
A platform for AI phone agents, used for inbound and outbound calls that follow your script and connect to your systems.
- Tool
- retellai.com
- Usually paired with
- Twilio, Cal.com, HubSpot, n8n
- Timeline
- Most builds live in 3 to 5 business days from scope
- Owned by
- You, with accounts, credentials and code in your name.
What we build on Retell
- Build phone agents for a defined call type
- Connect calendars, CRMs and call transfer
- Test on real scenarios before going live
- Review transcripts and tune the agent
What we sync
Workflows we are asked for
- Retell receptionist with calendar booking
- Retell lead qualification into a CRM
- Retell call transfer to a person
- Retell appointment reminder calls
Often paired with
Tools Retell usually needs to talk to.
-
Retell and Twilio
SMS, voice and WhatsApp messaging APIs.
-
Retell and Cal.com
Open scheduling with booking pages, routing forms and workflows.
-
Retell and HubSpot
The CRM and marketing platform most B2B teams of 10 to 1,000 run on.
-
Retell and n8n
The automation platform we build most systems on: code where needed, visual where not, cloud or self-hosted.
In every build
Standards we apply to every build.
Under the hood
- Upserts keyed on the record
Each write is matched on the source ID, so a retry or a re-fired event updates the existing record.
- Retries with backoff
Rate limits and timeouts are retried with increasing delays. If they still fail, they are parked for review.
- Idempotent, loop-safe writes
Two-way flows carry a marker so a change written by the sync does not re-trigger the sync.
- Reconciliation
A nightly job compares counts and totals on both sides and lists any record that differs.
- Audit log
Each run records the input, the mapping result, the action taken and what triggered it. You can search it by record.
For the team
- Slack or email notifications
Alerts go to a named person on your team, by Slack, email or WhatsApp.
- A runbook
One document per integration: what it does, what each alert means, and what to do in the first ten minutes.
- Training
A live session with the people who will use the review queue, recorded for whoever joins later.
- Handover
Admin access, billing and code sit in accounts in your name from the start, so the build keeps running if we stop working together.
- Sixty days of hypercare
The engineers who built it stay on call after go-live, fix what breaks and tune what the team asks for.
Keys and data
- Keys are kept in a vault
API keys and tokens are stored in the orchestration layer's encrypted credential store or the platform's secret manager. None are written into workflows, repos, spreadsheets or chat.
- One credential per connection
Each integration gets its own key, scoped to the objects and actions it needs. A lead sync cannot read invoices. Revoking one key stops one thing.
- Service accounts for connections
Connections use a dedicated service user in your account, so nothing breaks when a person leaves and nothing runs under someone's name.
- Two-factor on every account
Each platform account we set up has two-factor authentication on, and the recovery codes are handed to you.
- Rotation on handover and on request
Keys are rotated when the build is handed over, when anyone with access leaves, and at any time you ask.
The offer
Connect Retell to the rest of your stack.
We agree a fixed scope in a discovery call, and most builds go live in three to five business days. The accounts are in your name, and the engineers who built it stay on call for sixty days after.
- ScopeOne call to agree the workflows, the fields and the owner, written up the same day.
- BuildValidation, upserts, retries, reconciliation and an audit log, on n8n, Make or code.
- Go-liveWe test in a sandbox first, then switch over. It takes longer only where a vendor has to approve something.
- HandoverRunbook, training session, alerts to a named owner, admin access and code in your accounts.
- AfterSixty days of hypercare, then a care plan or run it yourself.
Questions
What people ask about Retell.
Retell, Vapi or ElevenLabs?
All three can run voice agents. We compare them on your call type, latency, voice quality and running cost, and our voice agents page covers how we choose.
Retell
Start with the one Retell workflow your team still runs by hand.
Bring it to a discovery call. You leave with a yes or no on fit, an outline of the build and what we would do first.
Book the call