I'm Zarko, an engineer in Belgrade, Serbia. For years I did voice infrastructure the normal way: a SBC in a rack or a VM, certificates renewed by calendar reminder, remote workers behind whatever router their ISP shipped, and pricing that charged clients per seat forever because that's how the vendors priced it to us.

The same three tickets kept coming in, from every client, on every stack:

  • A certificate expired and a whole office went dark — the 90-day renewal trap, at 3:00 AM, the night before someone's board meeting.
  • Calls dropped at exactly 32 seconds — Timer H expiring under RFC 3261, because a $79 home router was rewriting SIP headers and eating the ACK.
  • A client's margin vanished into a per-seat tax the incumbent collected simply because it could, with a $1,000/month minimum that locked out the small accounts entirely.

None of these are hard problems. They're process problems that vendors left as manual chores because manual chores bill hours, and because the people who felt the pain weren't the people signing the contracts.

So I built the thing I wanted to exist: VoipFlow — multi-tenant cloud infrastructure orchestration software that lets an MSP run Teams and Zoom voice for its whole client book under its own brand. Certificates issue and renew themselves in about 12 seconds. Signaling runs on port 5062 so residential SIP ALG rewriting stops mattering. Every client is an isolated tenant partition. And the price is flat — $399 or $799 — because the per-seat tax never bought anyone anything.

People have started calling it "The Stripe for MSP Voice." I take that as the compliment it's meant to be: infrastructure so automated that the boring parts disappear, and pricing that says the number out loud.

We publish our prices, our limits, and our proxy-media fallback budget (20%, stated plainly) because the engineers we build for would find them anyway — and because the fastest way to be trusted is to not require trust in the first place. The free tools on this site run with no signup because they're useful, and useful is the whole point.

If you run voice for clients, try the 14-day sandbox — no credit card, no sales follow-up unless you ask for it. If you're up at 2:00 AM with a 32-second drop, start with the troubleshooting pages — the manual fixes work, whether or not you ever become a customer.

— Zarko, Serbia