Callab AI

Callab AI is a Y Combinator-backed company that aI voice agents for on-prem PBX stacks. The company participated in the Spring 2026 batch of Y Combinator.

Callab AI - AI voice agents for contact centers. Over half the world's contact center infrastructure still runs on legacy telephony (CUCM, on-prem PBX, carrier-grade SIP) - a $70B+ market where current AI voice platforms can't natively integrate.

We plug into these environments without requiring a rip-and-replace. We serve clients across three continents, including brands like DunkinDonut.

Callab AI was part of Y Combinator's Spring 2026 cohort, has a team of approximately 7 employees, and is actively operating.