APIs & SDKs
VaxVoIP Agent AI SDK
SIP-to-OpenAI gateway for building real-time multilingual AI voice agents
An SDK that bridges SIP servers and IP-PBX systems with OpenAI real-time AI models to build multilingual voice agents for live phone calls.
Overview

A look at vaxvoip.com
VaxVoIP Agent AI SDK is a software development kit that connects SIP servers and IP-PBX telephone systems directly to OpenAI's real-time speech-to-speech AI models. It acts as a communication bridge, handling the complex SIP audio integration so developers can focus on building voice agent applications. The SDK processes live SIP call audio in real-time and enables natural, multilingual conversations between callers and AI agents. It includes working sample projects in Visual C# .NET, Visual Basic .NET, and Delphi, plus technical documentation and a 30-day fully functional trial.
Feature notes
- SIP server and IP-PBX integration
- OpenAI real-time speech-to-speech models
- Multilingual voice interaction
- Real-time SIP audio processing
- Sample source code in C#, VB.NET, and Delphi
- 30-day fully functional trial
- Simplified OpenAI integration
- Commercial B2B deployment licensing
Pricing
Pricing model: Paid
Annual commercial licensing: 10 concurrent calls $1,480, 20 concurrent calls $2,620, 40 concurrent calls $4,420, 80 concurrent calls $6,420, 160 concurrent calls $8,860, Unlimited concurrent calls $10,680, Unlimited services and unlimited concurrent calls $16,860 (all USD, one year, contact sales)
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FAQ
- What does VaxVoIP Agent AI SDK do?
- It works as a SIP-to-OpenAI gateway between a SIP server or IP-PBX and OpenAI real-time AI models.
- Do I need to manage the OpenAI integration myself?
- The SDK is designed to avoid the need to handle complex OpenAI APIs, AI protocols and low-level integration details directly.
- Can it process live SIP call audio?
- Yes. The SDK processes live SIP call audio, enabling real-time conversations between callers and AI voice agents.
- Does it support multiple languages?
- Yes. It supports multilingual AI voice agents that can respond naturally to callers in multiple languages.
- Which sample-code languages are available?
- Sample projects are available for Visual C# .NET, Visual Basic .NET and Delphi.
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