AI Voice Agent

An AI voice agent is a software system that can hold a natural spoken conversation with a human caller, understand their intent, take actions based on what they say, and respond in a human-sounding voice — all in real time, without a human agent being present. It is the convergence of large language models, speech-to-text, text-to-speech, and telephony infrastructure into a single experience that is indistinguishable from a well-trained human agent for a growing range of use cases. AI voice agents are transforming business communications at speed. They can operate 24 hours a day, handle unlimited simultaneous calls without queuing, maintain perfect consistency of tone and information across every call, and hand off to a human agent the moment the conversation requires it. Vobiz provides the telephony infrastructure that connects these AI agents to the public phone network, making them accessible from any phone in India or around the world.

Human agents are expensive, limited in availability, inconsistent under pressure, and unable to scale instantly. Every business that operates a call centre knows the pain of peak-hour queues, agent attrition, training costs, and the difficulty of maintaining quality at scale. AI voice agents address all of these simultaneously. But building an AI voice agent requires more than just an LLM. You need to connect the AI to a phone number, stream audio in real time from the call to the AI and back, handle the low-latency requirements of natural conversation, and manage the lifecycle of the call — including holding, transferring, recording, and ending. This is the layer that Vobiz provides.

The foundation of Vobiz's AI voice agent capability is the WebSocket audio stream. When a call arrives at a Vobiz number, the platform streams the raw audio to your AI agent's WebSocket endpoint in real time. The AI processes the speech, generates a response, and sends audio back through the same bidirectional WebSocket connection. Vobiz plays that audio to the caller. The entire loop — caller speaks, AI processes, AI responds, caller hears — happens in under a second. Vobiz supports multiple audio codecs and sample rates for this stream, allowing AI providers to select the format that gives their speech-to-text models the best accuracy. The stream can carry both inbound and outbound audio simultaneously, giving the AI full context of the conversation from both sides. Vobiz has documented integrations with the major AI voice agent platforms currently available. VAPI allows you to configure a Vobiz number as the telephony provider and have VAPI's AI orchestration layer handle the conversation. Retell AI connects through the same WebSocket mechanism, with Retell's agent logic processing the audio and generating responses. LiveKit uses a room-based model where Vobiz connects the phone call as a participant in a LiveKit room where AI agents are already present. ElevenLabs provides ultra-realistic voice synthesis, and Vobiz carries that synthesised voice to the caller's phone. Pipecat, OpenAI Realtime, Ultravox, and Bolna are all supported through the same underlying stream infrastructure. This means your choice of AI platform is not constrained by your telephony provider. You can use the best AI model for your use case, plug it into Vobiz, and have it speaking to real phone callers within hours.