By Sagar Shankaran, Founder of CallSphere
A cloned voice can release a load of fabricated steel at your gate. The callback rule, the shipment release code and the one question a clone cannot answer.
Key takeaways
It is 3:40 on a Friday afternoon in late September. A hotshot driver is idling outside the gate with an empty flatbed and no paperwork. The phone rings in the shipping office, and the voice on the other end belongs to the general contractor's project manager — the same man who has called your shop nineteen times this summer about the stair stringers for the parking deck. He says the crane window moved up to Saturday, he sent his own truck, release the load, he will sign the packing list Monday.
Your shipping clerk recognizes the voice. In 2026, that is exactly the problem.
Every fabrication and welding shop has a short list of things that happen on a phone call and nowhere else. A load gets released at will-call because the field crew showed up a day early. A verbal change order adds six more embed plates to an open purchase order because the GC does not want to wait on paper. A customer's accounts payable clerk calls to say the remit-to bank details changed, right before your progress billing goes out. A voice that sounds like your purchasing agent draws 40 feet of HSS4x4x1/4 on your account at the service center will-call counter.
None of those four actions requires a wet signature at the moment it happens. All four move value out of your shop. And all four are decided by one thing: whether the person holding the phone believes the voice.
Caller verification in a fabrication shop means one thing: nobody gets finished goods, a scope change, or a change to your remit-to address on the strength of a familiar voice — authority has to be proved somewhere other than the phone call.
The honest version: the clerk confirms the purchase order number is real, pulls the job in E2 or JobBOSS², prints the packing list, watches the driver sign it, and gets back to staging Monday's shipments. If something feels wrong, they walk it out to the foreman. If the foreman is under a hood on the far side of the shop with a helmet down, the load goes.
Most owners will tell you they have a callback rule. Most shops have a callback rule that quietly gets suspended in the last week of the quarter, in the middle of construction season, and any time a crane is on the clock. That is not a discipline problem, it is a design problem. The rule costs three minutes at the exact moment three minutes feels expensive, and it is enforced by whoever happens to be nearest the phone — often a part-time office person who has never met the project manager she is being impersonated to.
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The same weakness sits on your accounts payable side. A caller who sounds like your rep at the service center, who knows your account number and the last three items you bought, is very persuasive on a Tuesday when your controller is closing the month.
Copying a voice used to require a long, clean recording and real money. As of 2026 it needs neither. A short sample is enough, the tools are cheap, and the result holds up over a truck-stop cell connection — which is what your shipping office listens to all day anyway.
The samples are already public. Your foreman's outgoing voicemail greeting. A project manager speaking for four minutes at a pre-bid meeting that the county posted on its website. A jobsite walkthrough somebody put on LinkedIn. A trade show clip of you talking about the new fiber laser.
The second change matters as much as the first. Speech-to-speech systems now answer in roughly two tenths of a second, so a faked caller does not sound like a recording being played at you. They interrupt. They sigh about the weather at the jobsite. They answer a follow-up question about which bay the trailer should back into. The old advice — if it sounds robotic, hang up — expired.
flowchart TD
A["Caller asks to release job 41872 to a hotshot driver"] --> B{"Did the caller give the release code from the shipment notice?"}
B -->|No| C["Clerk takes details and releases nothing"]
C --> D["Clerk calls back the number printed on the customer PO"]
D --> E{"Real PM confirms and names the approved drawing revision?"}
E -->|No| F["Log the attempt, tell the owner and the GC office"]
E -->|Yes| G["Print packing list, driver signs, load leaves the gate"]
B -->|Yes| G
Three controls close most of this, and none of them require new software.
Callback to the number on the paper, never the number they give you. The number on the customer's purchase order, or the number in your customer record in E2 or JobBOSS². If the caller objects to a callback, that is the answer.
A release code tied to the shipment, not to the person. When you generate the shipment notice, put a four-digit code on the copy that goes to the email address already on file for that customer. No code, no release — the truck waits, or comes back Monday. It takes your shipping clerk out of the business of judging voices, which is not a skill anybody hired her for.
One question that is not on the internet. The heat number on the mill test report for the last load you shipped them. The revision letter on the approved shop drawing. The number of the last request for information. A person who has cloned a voice off a public video has none of that.
Where AI helps is on intake, not detection. An answering agent on your main line can be told flatly that it never releases goods and never accepts a remit-to change: it takes the request, reads back the job and purchase order number, sends the callback to the number on file, and writes a timestamped log entry.
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Assumptions, stated plainly: a stainless handrail and stair package, 38 fabricated pieces, shop rate $85 per hour fully burdened, office labor $42 per hour, twelve will-call releases a week across 50 weeks.
| Line | Assumption | Amount |
|---|---|---|
| Replacement 304 material and consumables | sheet, tube, filler, gas, abrasives | $6,900 |
| Expedite premium on replacement stainless | service center counter instead of mill order | $1,400 |
| Re-fabrication labor | 96 shop hours at $85 | $8,160 |
| Outside finishing rerun | passivation, crating, second freight | $1,150 |
| Back-charge for missing the crane window | per the subcontract | $2,500 |
| One event | $20,110 | |
| Cost of the callback rule for a year | 12 releases/week × 3 min × 50 weeks = 30 hours at $42 | $1,260 |
The rule pays for itself if it stops one successful fraud every sixteen years. Nobody in this trade gets sixteen quiet years.
No software can tell you a voice is fake with enough reliability to bet a load on. Detection tools exist and are still wrong often enough that you cannot make them the gate. Build the process so that being fooled does not matter.
Second, judgment stays human on the exceptions. A twenty-year customer whose PM is standing in the rain with a crane and a code he cannot find deserves a decision, not a policy recital. That decision belongs to you or your operations manager, on the record, in writing, and it should be rare enough that you remember each one.
Third, this does not fix your paperwork discipline. If your shop ships against verbal change orders and reconciles them in November, a caller does not need to clone anybody.
They are not targeting your handrail. They are targeting the payment. Fabricators sit in the middle of construction and manufacturing payment chains, invoicing five and six figures on progress billings, which makes the remit-to call worth an afternoon of somebody's time. Shop size is not the filter; invoice size is.
You can, and you should not lean on it. Treat it the way you treat a magnetic particle check on a fillet weld — useful signal, not a substitute for the procedure. The callback and the release code work whether or not the copy was any good.
Send it to their office as a policy change, in writing, once, with the reason: goods leave this yard against a code on the shipment notice, effective the first of the month, no exceptions for anyone including the owner. Contractors deal with credit holds, lien waivers and certified payroll every week. A four-digit code is the least of it.
No, but stop cutting metal against them. Take the call, confirm by email to the address in your customer record, and let the nest wait for the reply. On short-cycle work that is a two-hour delay. On a wrong-authority job it is the difference between a change order and a scrap bin.
If your main line is answered by whoever is closest, that is where this gets decided. CallSphere builds AI voice and chat agents that pick up your shop's phone and web chat around the clock, take the caller's job and purchase order details, book the callback, and log every request with a timestamp — including the ones that ask for something the agent is not allowed to give. It will not judge whether a voice is genuine, and it should not. It will make sure nobody ever gets to skip the step that does.
Written by
Sagar Shankaran· Founder, CallSphere
LinkedInSagar Shankaran is the founder of CallSphere, where he builds production AI voice and chat agents deployed across healthcare, hospitality, real estate, and home services. He writes about agentic AI, LLM engineering, and shipping voice agents that handle real calls in production.
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