Overview

For the complete documentation index, see llms.txt.

xAI’s Grok Voice Agent API is available in Voximplant as a native VoxEngine connector, so you can build real-time voice agents with telephony-grade audio streaming and call control.

Benefits

• Built-in WebSocket connector: Voximplant handles WebSocket media, audio formatting, sample rate, and packet sizing so you can focus on call logic. https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• Real-time voice interactions: Grok streams responses as they’re generated for low-latency conversations. https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• All-in-one speech stack: STT and TTS are part of the Grok Voice Agent API (no separate providers required). https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• Context-aware responses with file_search, web_search, and x_search. https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant

Prerequisites

• xAI account with Voice Agent API access.
• xAI API key from your xAI account.

Demo video

Outbound calling with xAI’s Grok Voice API demo:

Video link: How to Use Grok Voice Agent for Outbound Calls

Architecture

Voximplant’s Grok Voice Agent API integration uses a WebSocket connection to stream audio between VoxEngine and Grok. The Voice AI connector handles connection establishment, media conversion, playback, and audio capture.

Tool calls detected by Grok are signaling in events where you can implement custom logic and provide a response in your VoxEngine scenario.

Development notes

• The Grok Voice Agent API uses WebSockets only; Voximplant manages the connection. https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• Load the module with require(Modules.XAI) and create a VoiceAgentAPIClient inside VoxEngine. https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• Use VoxEngine.sendMediaBetween(call, client) to bridge call audio to Grok. Grok Voice Agent API client guide
• For barge-in, clear the media buffer on InputAudioBufferSpeechStarted. https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• Store your xAI API key in Voximplant Secrets under XAI_API_KEY. Grok Voice Agent API client guide
• Choose the Grok voice model with the optional model parameter in XAI.createVoiceAgentAPIClient(...). The examples explicitly use grok-voice-think-fast-1.0; change GROK_MODEL if your xAI account should use another Voice Agent model. https://docs.x.ai/docs/guides/voice/agent#model-selection

Links

• Blog post: https://voximplant.com/blog/grok-voice-agent-api-now-available-in-voximplant
• Grok Voice Agent API client guide
• Grok VoxEngine module reference
• xAI Grok Voice Agent API announcement: https://x.ai/blog/grok-voice-agent
• xAI Voice Agent API docs: https://docs.x.ai/docs/guides/voice/agent
• Example repository: https://github.com/voximplant/grok-voice-agent-example