Engineering
How we built business calling on Telnyx (and why we didn't roll our own SBC)
Why Hey Quad runs on Telnyx instead of bare metal - call control, SIP trunks, multi-tenant routing, and the trade-offs of building voice in 2026.
7 min read
Engineering
How Hey Quad is built — VoIP internals, SIP, infrastructure, and the trade-offs behind it.