Callab AI
AI voice agents for the call centers still running on-prem phone systems. Callab connects to legacy PBX hardware like Avaya, Cisco UCM and Mitel over a SIP trunk, routes calls to AI agents, and goes live in about a week with no rip-and-replace. It handles routing, scheduling, order status and inquiries. YC 2026.
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Our take
Voice AI agents for call centers still on legacy, on-prem phone systems. Callab connects to PBX hardware like Avaya, Cisco UCM and Mitel over a SIP trunk and goes live in about a week with no rip-and-replace, automating up to 70% of inbound calls. YC 2026; serving brands like Dunkin'. Agent; outcomes vendor-reported.
Best for
Call centers on legacy on-prem PBX hardware that want AI call handling without replacing their stack.
Pros
- Connects to legacy PBX (Avaya, Cisco, Mitel)
- Live in about a week, no rip-and-replace
- Automates routing, scheduling, order status
- Targets the unserved on-prem segment
Cons
- Telephony focus, not full CX suite
- HIPAA/regulated use still on the roadmap
- Early-stage (YC 2026)
How it compares
Where Vapi and Retell target cloud-native voice, Callab's wedge is the 58% of the call-center market still on on-prem hardware that those tools don't reach.
Full review
Callab AI puts AI voice agents on the phone systems most contact centers still run: on-prem PBX hardware. It connects directly over a SIP trunk to platforms like Avaya, Cisco UCM and Mitel, so calls route to an AI agent, get handled, and return without the business migrating to a new cloud system.
It automates up to 70% of inbound volume across routing, appointment scheduling, order status and customer questions, and the company says it can go live in about a week. Part of Y Combinator's 2026 batch, Callab serves clients across three continents, including brands like Dunkin', and is expanding into hospitality, logistics, retail and property management. As an agent its automation figures are vendor-reported, so Outcome is scored conservatively.
Cloudkart Trust Graph
3.6/5- Actual Utility4/5
Source: Initial LLM-authored rubric (backfill)
- Ease of Use4/5
Source: Initial LLM-authored rubric (backfill)
- Pricing Fairness3/5
Source: Initial LLM-authored rubric (backfill)
- Reliability3/5
Source: Initial LLM-authored rubric (backfill)
- Differentiation4/5
Source: Initial LLM-authored rubric (backfill)
Scored as of . Each score is versioned and auditable; vendors cannot buy it.
How this score is set
- Editorial rubric
- Primary signal — five dimensions, 3.6/5 average.
- Community reviews
- None yet.
- Pricing verified
- Not yet verified
- Independence
- Score set by our editorial team before any affiliate relationship is considered. No vendor can buy it.
Frequently asked questions
- Is Callab AI free, and how much does it cost?
- Callab AI is a paid tool.
- Who is Callab AI best for?
- Call centers on legacy on-prem PBX hardware that want AI call handling without replacing their stack.
- How is Callab AI rated on Cloudkart.ai?
- Callab AI scores 3.6 out of 5 on the Cloudkart.ai rubric, which weighs actual utility, ease of use, pricing fairness, reliability and differentiation. Scores are set editorially and can never be bought.
Community reviews
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