Voice & Phone Agents

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.

Observe.AI builds customer experience agents that handle voice and chat workflows for enterprise support teams. It focuses on accurate intent capture, policy-controlled execution, and integrations with existing business systems.

Infinitus provides voice AI agents for healthcare teams that need to automate routine calls with patients, payors, and providers. It is aimed at reducing administrative burden while improving access, adherence, and coverage workflows.

PolyAI is a customer-facing voice agent platform built for businesses that want to automate conversations without rebuilding their tech stack. It offers out-of-the-box and custom integrations, plus webchat, so teams can add conversational automation around their existing systems.

Decagon is a customer support AI platform with voice and guardrails built for enterprise use. It helps teams deploy agents across support workflows with authentication, encryption, audit logs, and resiliency controls.

Sales Closer AI helps you automate sales demos, discovery calls, scheduling, and follow-ups with no code required. It’s aimed at businesses that want always-on sales coverage across multiple languages and customer touchpoints.

REGAL helps businesses build and manage voice AI agents for phone-based customer interactions. It is aimed at CX, support, and operations teams that want to automate calls, reduce wait times, and route complex conversations more efficiently.

VoiceFleet provides an AI phone receptionist for businesses that need 24/7 call answering, booking capture, and call summaries. It’s aimed at teams like dental practices, medical clinics, restaurants, and other front-desk-heavy businesses that want to reduce missed calls.

ElevenLabs provides text-to-speech, voice cloning, dubbing, and speech-to-text tools through a web app and API. It is aimed at creators, developers, and businesses that need high-quality synthetic audio and conversational voice workflows.

Retell AI lets you connect an AI call agent to Zoho CRM so it can look up customer details, manage leads, and update records while a call is in progress. The Zoho CRM connection is described as an unofficial connector, typically set up through custom API work or a Retell partner.

Krisp is a voice AI platform for meetings, call centers, and developers. It focuses on noise cancellation, meeting transcription and summaries, accent conversion, and real-time voice tools.

Deepgram provides a developer-first Vietnamese speech-to-text API for real-time and batch transcription. It’s built for low latency, noisy audio, and enterprise-scale use cases.