Founder · Fonoster · Voice AI

It's time to rethink how voice is built.

I help engineers and operators ship modern Voice AI without drowning in legacy stacks. Join 8,000+ builders getting one hard-won lesson every week.

Pedro Sanders
8,000+ BUILDERS READING
Voice AI · 2026 Build what's next
01 / ABOUT

Hi — I'm Pedro.

I help engineers and operators ship modern Voice AI — without drowning in the legacy stack.

For 15 years I've worked at the edge of communications infrastructure — SIP, RTP, media servers, and now Voice AI. I built Routr because the open-source telephony stack needed something easier to operate. I'm now building Fonoster to make programmable voice approachable for the next million developers.

Most companies don't need an entire PBX to ship a great voice experience. They need clarity. They need patterns that work. They need someone who's been on the other end of a 3 AM Asterisk crash and lived to tell about it.

That's what I write about. That's what I teach. And it's why 8,000+ builders open my emails every week.

More about me
FREE · 3-PAGE GUIDE

Start with The Voice AI Stack. Three pages mapping how modern voice systems actually fit together.

From the carrier edge to LLMs. SIP, media, ASR, TTS, and agent orchestration. What they do, what they don't, and how to pick.

Get the guide 4,200 downloads
02 / OFFERS

Three ways to work with me.

From a $49 handbook to a hands-on embed — built from real production incidents, not slides.

WORKING SESSIONS · LIVE

Voice AI Infrastructure Roadmap

Three sessions. You walk away with a documented plan for what to build, what to skip, and in what order.

3 sessions Written roadmap ~2–3 weeks
$1,200 one-time
See how it works
EMBED · BY APPLICATION

The Embed

I join your team to architect and de-risk your voice infrastructure — as the person who's actually built one at scale.

Fixed scope 8–12 weeks 1–2 at a time
$15K starting
See how it works
03 / WRITING

Recent essays.

Read all essays

KARMA was right. Until it wasn't.

At millions of calls a day, the cracks in the classic voice stack show — and why I'm choosing less in 2026.

Read essay

Stop pitching the demo. Ship the outcome.

Most Voice AI demos are theater. Here's what actually matters when a real customer answers.

Read essay

Why Routr is boring (on purpose).

A SIP server should be invisible. The lessons from 4 years of building one in the open.

Read essay