Callab AI

AI voice agents for on-prem telephony stack.

Y CombinatorSpring 2026ActiveB2BOperationsB2BCall CenterAI

What they do

Problem

Call centers running legacy on-prem PBX phone systems cannot easily adopt AI voice automation without costly infrastructure migration.

Solution

Callab AI provides AI voice agents that integrate directly with on-prem telephony stacks (e.g., Avaya, Cisco UCM, Mitel) to automate a large share of call volume without replacing existing systems.

Who it's for

Enterprises and large contact centers using on-prem PBX telephony infrastructure.

Founders

Haithem Kchaou

Co-founder/CEO

Second-time founder; scaled a mobile app to 200K+ downloads. Led a sovereign national AI initiative that provided free LLM access to over 300,000 students. Co-published 2 research papers on LLM fine-tuning and data collection. Thomas Jefferson Scholar (top 2% of applicants).

LinkedIn · X

Chehir Dhaouadi

Founder

- Software engineer who built and scaled telecom and VoIP systems across the Middle East and North Africa. - Co-built a mobile app scaled to 200K+ downloads. - Deployed local LLM instances in a government datacenter to power free student access at national scale. - Co-published 2 research papers on LLM fine-tuning and data collection. - Trained over 300 developers.