Memox stopped renting its phone agent at $0.09 a minute

What Memox got back: a dialler that waits when a number is outside its lawful window and drops suppressed numbers before a dial, and a per-minute rate that is no longer a vendor’s list price. That is the outcome for sale here: the vendor bill you stop paying. Autonomous Technologies is the engineering firm that built it. We build and run the systems behind online stores and software products for the people who own them after launch. Memox is our own product, not a client brief. A business feeds it documents, puts it on its website, and it answers customer questions. Two paying customers, roughly $50k a year as of September 2026, none of it from the phone channel.

The rented tool went in on 11 September 2025 and kept taking repair work into February 2026. It broke twice in four days that December. The next vendor on the list cost $0.05 a minute, with the same limits.

If your product lets a customer upload numbers and dial them, you ship an outbound calling machine. A suppression list is the set of numbers you must never call. A calling window is the hours local law lets you call them. Before April 2026 the code had neither.

Most of AI voice agent development is not the model. It is the call path: the phone line, the sound bridge that carries audio between the line and the model, and the rules. A lead backend engineer wrote 83 of the 122 changes. The founder wrote 27 and kept the hardest sound problems. Abdullah, a founding engineer, wrote 12.

The phone company choice removed work. Telnyx is the carrier that connects the calls. It sends sound in the shape the model expects, so the converting step is one line. A second choice bought back the worst second of any call. The model connects and the greeting is ready while the phone still rings.

Between picking a contact and dialling it, two checks run: the suppression list, then the calling window. Neither can be skipped.

The window rules are code, not a policy document. Eighteen state rules are stricter than the federal default. Twenty-seven automated tests hold the values. Maine is weekdays only. Rhode Island bans Sunday calls.

The system works out which state a number sits in. It maps 316 area codes to states, and 51 states and districts to timezones. A number outside its window waits for the next lawful moment.

No campaign starts until someone records that consent was obtained. Outbound calling stays locked until a business verifies itself. The launch screen makes the operator read who carries the legal risk.

When a list is uploaded, the import step checks each number’s format. It scrubs the list against the suppression list and removes duplicates before a single dial. Two dialling processes on the same campaign cannot dial one contact twice. A contact is locked the moment one of them picks it up. The rented dialler gave us no way to prove any of that. Source: Memox voice-app import and campaign code, read 20 September 2026.

The echo and noise filter is real work, and it is switched off. A sample is one slice of sound. The filter hands sound back in blocks of 256 samples, but a phone line feeds it blocks of 160. Wired together directly, most of the sound comes back empty and the call goes silent.

A holding step now evens the two sizes out, at about 16 milliseconds of delay. That closed one of four activation gates. An activation gate is a named test a feature must pass before it is switched on. Three stay open: measured echo, a speed ceiling, and a tested rollback.

One outage is on the record. The phone company’s software dropped the helper that checked incoming call events were genuine. Inbound calls stopped. Abdullah wrote the check himself and merged it at 14:30 on 15 June 2026. Nobody recorded how long it was down.

Put a source, an owner and a review date on every state rule. Today nothing says who sourced each rule.

Wire the opt-out, a caller asking never to be called again, straight to the suppression list. Today it travels through the job that syncs to the customer database, which stops early when no such database is connected.

Record a cost and delay baseline on the first real call. The $0.030 a minute is a model nobody has held against a bill.

Build this if you place calls into a regulated market and carry the liability. Build it if your vendor cannot show where the check runs. What you buy back is the unlawful call you never place and the rate you stop paying: work worth owning rather than renting. Related: the embedded team on this platform.

Do not build this if you need a line answering next week, or place a few hundred calls a month. Rent one.