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Callab AI

YC X26

San Francisco, US · Founded 2024 · 7 employees · Hiring · 13 known investors

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Callab provides AI voice agents for enterprise contact centers that integrate with existing PBX, SBC, and telephony infrastructure via SIP without migration. The platform handles inbound support, outbound campaigns, appointment scheduling, and lead qualification with real-time human supervision, call recording, transcription, CRM integration, and compliance controls.

Also known as Unilabs

AI & Machine LearningEnterprise SoftwareSaaSUnited States of AmericaAmerica / CanadaPartly Remote

Founders & leadership· Y Combinator alumni (X26)

Callab AI was founded in 2024 by Haithem Kchaou and Chehir Dhaouadi.

HKHaithem Kchaou
Haithem KchaouCEOHaithem Kchaou is a second-time founder who previously scaled a mobile application and led a national AI initiative providing large language model access to students. He has co-authored research on large language model fine-tuning and data collection methods.
CDChehir Dhaouadi
Chehir DhaouadiCTOChehir Dhaouadi is a software engineer with experience building telecommunications and VoIP infrastructure across the Middle East and North Africa, and has co-developed a mobile application that reached over 200,000 downloads. He has also deployed machine learning infrastructure for educational access and co-authored research on large language model fine-tuning.

Investors · 13

P1 Ventureslisted by P1 VenturesGrand Cayman · $100K – $1M

How we know: Y Combinator's founder network · Not right? Tell us

Rebel Fundlisted by Rebel FundSan Francisco · $100K – $5M

How we know: Y Combinator's founder network · rebelfund.vc · Not right? Tell us

Zero Indexlisted by Zero Index

How we know: Y Combinator's founder network · Not right? Tell us

216 CapitalreportedTunis

How we know: Y Combinator's founder network · Not right? Tell us

DFS LabreportedParis · $50K – $1M

How we know: Y Combinator's founder network · Not right? Tell us

Flourish VenturesreportedSan Francisco · $100K – $5M

How we know: Y Combinator's founder network · Not right? Tell us

Go Big PartnersreportedAriana

How we know: Y Combinator's founder network · Not right? Tell us

JN Ventures GmbHreported

How we know: Y Combinator's founder network · Not right? Tell us

RobinhoodreportedMenlo Park

How we know: Y Combinator's founder network · Not right? Tell us

Sandwith Ventures, LLCreported

How we know: Y Combinator's founder network · Not right? Tell us

Start Equity Venturesreported

How we know: Y Combinator's founder network · Not right? Tell us

Team IgnitereportedFolsom · $15M

How we know: Y Combinator's founder network · Not right? Tell us

Images

Callab AI photo

Related companies · 2

ElevenLabsElevenLabs is an AI research and product company that builds voice generation and audio processing platforms for creating human-like voice interactions with technology. The company serves individuals with accessibility needs, nonprofits, and general users across healthcare, education, and culture.
CleanlabCleanlab develops machine learning tools for data quality and model improvement, serving enterprises and ML practitioners across industries. The company provides automated solutions for identifying and fixing data errors using confident learning technology.

Companies working in the same space as Callab AI.

Legal entities · 1

corporate structure
Unilabs

In the news

Callab AI - AI voice agents for legacy phone systems.ycombinator.com · May 2026

Frequently asked questions

What does Callab AI do?
Callab provides AI voice agents for enterprise contact centers that integrate with existing PBX, SBC, and telephony infrastructure via SIP without migration. The platform handles inbound support, outbound campaigns, appointment scheduling, and lead qualification with real-time human supervision, call recording, transcription, CRM integration, and compliance controls.
Who founded Callab AI?
Callab AI was founded by Haithem Kchaou, Chehir Dhaouadi in 2024.
Who are Callab AI's investors?
Callab AI's investors include Y Combinator, P1 Ventures, Rebel Fund, Zero Index, 216 Capital, DFS Lab, Flourish Ventures, Go Big Partners and 5 more.
Where is Callab AI headquartered?
Callab AI is headquartered in San Francisco, US.