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Sierra AI

AI phone agents for customer service calls

Sierra Voice brings conversational AI to phone support, with agents that can talk naturally, handle interruptions, and act inside your internal systems. It’s built for customer experience teams that want to replace or augment traditional call flows with a more adaptive voice agent.

Enterprise
iOS
Voice
Integrations
B2B
A2A Support
Fully Autonomous
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About

What It Is

Sierra Voice is an enterprise customer support product for handling phone calls with AI agents. According to Sierra, it’s built to deliver natural, personalized conversations over the phone while fitting into existing call center and support workflows.

What to Know

Sierra positions the product as a governed, enterprise-ready voice agent platform rather than a general chatbot. The documentation emphasizes security, compliance, deterministic system access, and supervisory layers around LLMs to reduce...

Key Features
Natural voice responses with interruption handling
Accesses internal systems to complete customer requests
Connects to major call center platforms, phone systems, and compliance tools
Transfers calls to human agents with AI-generated summaries
Skills-based routing for escalations
Use Cases
Automating inbound customer support phone calls for a contact center
Handling routine questions and account-related tasks over voice
Escalating complex calls to human agents with context and summaries
Agenticness: Adaptive Collaborator

Proposes and executes multi-step plans with your approval.

High evidence
Last evaluated: Mar 31, 2026

Dimension Breakdown

Action Capability
Autonomy
Adaptation
State & Memory
Safety
How agenticness works →

Categories

Voice & Phone Agents
Customer Support
Pricing

Pricing not publicly available

Details
sierra.ai
AddedMarch 31, 2026
RefreshedMarch 31, 2026
Agenticness
Adaptive Collaborator
Quick Facts
DeploymentCloud-hosted
AutonomySemi-autonomous
Model supportMulti-model
Open sourceNo
Team supportEnterprise
Pricing modelSubscription
Interfacevoice, api, web
Sources
WebVoice | Sierra
WebDocumentation
Last updated April 26, 2026
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