It talks over your callers.
- Why it happens
- Turn detection tuned for a quiet room, not a car, a kitchen or someone who pauses to think.
- How I fix it
- Tune when the agent decides you’ve finished, and let callers interrupt it cleanly.
For agencies building on Retell
Your client’s agent is failing on real calls? I fix it in 72 hours.
Missed bookings, talking over callers, dead air. I find the real cause across Retell, your webhooks and the calendar, then fix it. One agent, $700 fixed. You pay when it passes the test we agreed.
- 48-hour rush when a client is about to leave
- Can work on a copy, not your live client
- Your client never hears from me
Mahad NaveedApplied AI engineer · Co-Founder & CTO at BIMxAI
Talk to my demo agent
Ask it what a fix costs, or try interrupting it.
Your browser will ask for your microphone. Calls are recorded so I can improve the agent. Privacy
The problem
Where voice agents break on real calls
Your client doesn’t care why. They just hear it. These are the four I fix most.
It goes quiet for two seconds.
- Why it happens
- A slow webhook, a bigger model than the job needs, or a prompt that’s far too long.
- How I fix it
- Find the slow step in the real call logs, speed it up or trim it, and add a short filler line while a tool runs.
It says it booked, but the calendar is empty.
- Why it happens
- A call to the calendar, GoHighLevel or an n8n webhook failed silently, and the agent confirmed anyway.
- How I fix it
- Trace the booking from Retell through the webhook to the calendar, check every result before the agent says “done”, and add a fallback.
It worked yesterday.
- Why it happens
- A prompt or model change with no test calls behind it.
- How I fix it
- A set of scripted test calls that runs before every change, so you hear about breaks before your client does.
Case studies
Real agents, real fixes
What broke, what I tried and what worked, from client agents. Clients stay anonymous.
The agent knew the opening hours. It couldn’t tell if the office was open.
A client’s phone agent read the opening hours back perfectly, then forwarded calls at the wrong times. A bigger model fixed it but made every reply 1.5 seconds slower. The fix kept the model, the speed and the cost.
- Latency kept. GPT-5.1 took 2.1 s
- 0.6 s
- Model and API cost per call
- Same
- Small workflow, on the client’s own n8n
- 1
The flow had a node for everything. That was the problem.
A receptionist agent was split into 12 nodes, one for each department and request. It passed every test, then went live. Replies took over 3 seconds and the agent started making things up. The fix was fewer nodes, not more.
- Nodes in the flow, before and after the fix
- 12 → 4
- Latency on live calls before the fix
- 3 s+
How it works
From broken demo to a passing test
One agent, one fixed price, and a test we agree on before I start.
Audit
Send me your demo link. I test it and send you a 3-minute video of what breaks and how I’d fix it.
Agree the test
Which calls are in scope, and what passes. For example: “reply under 1 second on 20 test calls” or “20 out of 20 bookings land in the calendar”.
Fix
I fix the agent, on a copy if you prefer, and run the test calls until it passes. Need it in 48 hours? There’s a rush option.
Handover
Before and after recordings, the test results and a short note on what changed. Pass it on to your client as your own.
Voice agent fix
$700 fixed, per agent
No hourly billing and no surprises. The audit comes first and is free.
Start with a free auditYou pay when it passes the test we agreed.
- A fix for one agent: talking over callers, slow replies, failed bookings or tool calls, prompt clean-up
- The whole call traced: Retell, your n8n or GoHighLevel webhooks and the calendar
- A written test agreed before I start, like “reply under 1 second on 20 test calls”
- A set of scripted test calls, run until the agent passes
- Before and after recordings, the test results and a short note on what changed
- Delivered in 72 hours, or 48 with the rush option
About
I make things work after the demo
I’ve been building software since 2019, when I started taking web projects on Fiverr. Since then I’ve been CTO at three startups, and today I’m Co-Founder & CTO at BIMxAI.
Voice agents are the hardest thing I’ve shipped. In a demo, nobody interrupts, the Wi-Fi is perfect and the calendar always answers. On real calls, none of that holds. Closing that gap is my job.
- Building software since 2019
- CTO at 3 startups
- Antler Entrepreneur in Residence (2025)
- Voice agents on Retell, Vapi and Pipecat
- n8n workflows behind live phone agents
FAQ
Questions agencies ask
Is the audit really free?
Yes, for the first few agencies. Send me your agent’s demo link and I send back a 3-minute video showing what breaks and how I’d fix it. No call needed.
How fast is the fix?
72 hours from when I have access and we’ve agreed the test. If your client is close to leaving, there’s a 48-hour rush option for an extra fee.
Which platforms do you work with?
Retell is where I do most of my work. I’ve also built voice agents on Vapi and Pipecat. If yours runs on something else, send the demo link anyway: the free audit shows whether I can fix it before you pay anything.
What if the problem is in GoHighLevel or n8n, not Retell?
That’s often where it is: a webhook that times out, or a calendar call that fails without telling anyone. I trace the whole call, from Retell through your webhooks to the calendar, not just the prompt.
When do I pay?
You pay when it passes the test we agreed. We write the test down before I start, then I fix the agent and re-run the test calls until it passes. Nothing is due before that.
Do you need access to my client’s live account?
No. I can work on a copy of the agent in a separate Retell workspace, with a test calendar or a GoHighLevel test sub-account. I use test calls and fake data. Your client’s data stays yours.
Will my client know you were involved?
No. I work behind your agency and never contact your client. The handover notes are yours to pass on as your own.
What about time zones?
I work from Islamabad (UTC+5), in English. For US agencies, that means I’m working while you sleep, and updates are waiting when you wake up.
Get a free audit of your voice agent
Send me your agent’s demo link. I’ll test it and send you a 3-minute video showing what breaks and how I’d fix it. Free for the first few agencies.
This opens your email with the link filled in. No call, no commitment.
Rather talk first? Book a 15-minute callOr email [email protected]