Callab AI builds voice agents for enterprise contact centers. The company is backed by Y Combinator (P26 batch), with deployments across North America, Europe, and the Middle East.

Most voice AI platforms depend on cloud telephony and third-party middleware, which breaks down inside large enterprises running on-premises systems such as Cisco CUCM, Mitel, and legacy SIP infrastructure. Callab AI built a proprietary carrier-grade telephony stack that connects natively to this infrastructure, so enterprises can deploy voice agents without migrating anything to the cloud.

Engineers at Callab AI work at the intersection of real-time voice AI and carrier-grade telecom infrastructure, an area where very few teams operate. The team is small and deeply technical, and every engineer owns systems end to end.