VaxVoIP SIP Server SDK: Develop Secure, AI-Enabled VoIP Solutions
VaxVoIP SIP Server SDK provides powerful tools for developing secure SIP (Session Initiation Protocol) based VoIP servers and building a wide range of VoIP services.
- AI-Powered IP-PBX Systems for Smart VoIP
- AI-Driven Auto Dialer and IVR Solutions
- Smart VoIP Multilingual Agents
- PC to Phone VoIP Services
- VoIP Call Center Systems
- Prepaid Calling Card Solutions
- VoIP Call Termination Services

ADVANCED SECURITY SOLUTIONS WITH VAXVOIP SIP SERVER SDK
The VaxVoIP SIP Server SDK is designed to enhance the security of your SIP-based VoIP server, safeguarding it from common cyber threats like SIP scan, flood, and brute force attacks. These attacks can cause service disruptions and compromise communications.
AI-POWERED VOIP SOLUTIONS WITH VAXVOIP SIP SERVER SDK
The SIP Server SDK offers real-time access to audio PCM data from VoIP calls, enabling integration of AI and machine learning into IP PBX systems for enhanced user experiences.
Please click Samples to download the sample code for the Smart Talk Agent and Smart IVR.
WHY CHOOSE SIP CALL AUDIO ACCESS?
Advancing AI Capabilities in VoIP Systems
For on-premises solutions, collect and preprocess PCM audio, train AI models (e.g., Silero, Whisper, LLaMA, NLLB-200, Facebook MMS-TTS) and integrate machine learning to enhance VoIP systems.
Integrate OpenAI and Gemini Speech Models
Access audio PCM data to integrate real-time Speech-to-Speech APIs for building multilingual AI voice agents.
Real-Time Sentiment Analysis of Call Center Agents
Enable real-time sentiment analysis by accessing PCM audio with OpenAI or Gemini APIs. For on-premises solutions, integrate the Twitter RoBERTa model.
DEVELOP A SIP SERVICE WITH 30-DAY TRIAL FOR VOIP COMMUNICATION
Fully functional demo applications and sample code are available for download, helping you understand the development of a SIP server, PBX systems, IVR (Interactive Voice Response), AutoDialer, and integration with other services.
FEATURES
VaxVoIP SIP Server SDK includes advance VoIP (Voice Over Internet Protocol) and IP-Telephony features. It is specially designed for Microsoft Windows operating systems, and works on all Microsoft Windows operating systems.
Highly customizable Solution
The VaxVoIP SIP Server SDK offers a comprehensive package, including sample codes, a technical manual, the COM component (VaxTeleServerCOM.dll), and a demo application. This all-in-one solution empowers developers to create SIP servers with ease.
Enhance Your SIP Based VoIP Server Security
VaxVoIP Server SDK secures SIP-based VoIP servers against threats like SIP scanning, flooding, and brute-force attacks.
AI MACHINE LEARNING AND MODEL TRAINING
VaxVoIP enables advanced AI integration in VoIP systems by providing access to PCM audio for training and inference. Developers can integrate real-time speech-to-speech APIs like OpenAI and Gemini to build multilingual voice agents and perform sentiment analysis during live calls.
On-premises deployments can use models like Silero, Whisper, LLaMA, NLLB-200, Facebook MMS-TTS for secure and localized AI processing.
Easy to understand sample source codes
The VaxVoIP SIP Server SDK includes sample code for various development tools, helping developers understand the SDK and build powerful VoIP solutions with ease.
Boost VoIP Server Performance with Multi-Tasking Support
The VaxVoIP SIP Server SDK leverages multi-core and multi-processor systems to boost performance, enabling high-capacity, reliable VoIP communication with efficient load distribution.
Play wave (.wav) files
Leveraging buffered-based compression technology, VaxVoIP SIP SDK optimizes CPU resource utilization by compressing wave data only once and utilizing buffered data for subsequent playback. This innovative approach significantly reduces voice compression processing load on the CPU, thereby enhancing server efficiency.
Setting up call queues and playing music
Easily create priority, circular, random, or custom queues with music playback during queue calls.
Establishing ring groups
Easily implement ring groups to ring multiple phones simultaneously when one phone is called.
Setting up pickup groups
Easily add call pick-up functionality to answer another person's call with a single action.
Call parking
Easily develop call parking to hold a call at one extension and resume it from any other.
Call barging
Develop call barging to monitor or join live calls for training and supervision in call centers.
Multi-user server side conference rooms
VaxVoIP SIP Server SDK enables server-side multi-user call conferencing and chat rooms by adding multiple calls to a single server-side conference room.
Call Transfer
VaxVoIP SIP SDK with integrated SIP server enables seamless server side call transfers including blind, attended, and regular from any SIP client like softphones, hardphones, or ATAs.
Call Recording
Easily integrate call recording in VaxVoIP SIP SDK integrated SIP server to save conversations as WAV files for call centers, IVR, voicemail, and more.
DTMF tone detection
Real-time DTMF detection with VaxVoIP SIP SDK supports INBAND, RTP (RFC 2833), and SIP INFO methods, ideal for IVR, call centers, and other VoIP applications.
NAT and firewall friendly
Reliable NAT/firewall compatibility with VaxVoIP SIP Server SDK ensures effortless connectivity for SIP clients without requiring STUN, E-STUN, or port forwarding.
Supported SIP based client and phones
Universal SIP protocol support with VaxVoIP SIP Server SDK ensures compatibility with all SIP-based clients for registration and two-way call communication.
SAMPLE CODES
After downloading, unzip the files, review the ReadMe.txt for instructions, and refer to the TECHNICAL MANUAL for detailed guidance.
IP-PBX BASIC
Visual cSharp .NET
Visual Basic .NET
Visual C++
Delphi
IP-PBX ADVANCE
Visual cSharp .NET
Visual Basic .NET
Visual C++
Delphi
SMART AUTO DIALER & IVR (INTEGRATED WITH OPENAI)
Visual cSharp .NET
Visual Basic .NET
AUTO DIALER & IVR
Visual cSharp .NET
Visual Basic .NET
We're delighted to offer a 30-day free trial of our product. You're welcome to download any of our sample code samples and give them a try. This trial period allows you to explore the functionality and capabilities of our product firsthand.
DEMO APPLICATIONS
Take advantage of a 30-day trial period to download and utilize these demo applications.
DOCUMENTATION
TECHNICAL MANUAL (EXPORTED FUNCTIONALITY)
HOW TO INTEGRATE OPENAI WITH YOUR VOIP SYSTEM
ACCESS AUDIO DATA (AI MODEL TRAINING & SPEECH PROCESSING)
SIP SERVER SECURITY (THREAT DETECTION AND PREVENTION)
SIP SERVER PERFORMANCE (LOAD TESTING)
SIP CLIENT REGISTRATION PROCESS
SIP PHONE TO SIP PHONE CALL PROCEDURE
HOW TO CONNECT TO PSTN/GSM NETWORK
HOW TO CONNECT TO IP-TELEPHONY SERVICE PROVIDER (ITSP)
HOW TO ACTIVATE YOUR LICENSE KEY
DOWNLOAD SIP SDK
VaxVoIP SDK: Your SIP Server Development Solution. Our SIP Server SDK, inclusive of sample codes, a technical manual, the COM component (VaxTeleServerCOM.dll), and a demo application, provides a comprehensive set of tools for your development needs.
Download VaxVoIP SIP Server SDK v8.6
Take advantage of our 30-day free trial by downloading VaxVoIP SIP Server SDK to experience its capabilities firsthand.
PRICING
We offer single product/software-based licenses for the VaxVoIP SIP Server SDK. This licensing model allows you to use one license with a single product or software solution.
VaxVoIP SIP Server SDK (LICENSE PRICING)
Our SDK has no mandatory maintenance fees, and all users receive free technical support, access to updated versions, and bug fixes.
However, we also offer optional support and maintenance packages for customers who prefer dedicated, high-priority assistance. These packages provide responsive, expert-level support. In the event of major issues, our technical team will collaborate closely with you to analyze crash dumps, memory usage, and system diagnostics to ensure a fast and effective resolution.
FREQUENTLY ASKED QUESTIONS
How to get a trial?
Download the SDK, Demo Application, or any of our sample codes and feel free to explore them for a trial period of up to 30 days.
How to develop a SIP Server?
Explore our website for accessible SAMPLE source codes, demo applications, and a comprehensive TECHNICAL MANUAL covering exported functions and events.
How Can I Secure My SIP Server built with the VaxVoIP SDK from external VoIP threats?
The VaxVoIP Server SDK offers methods and events to detect and mitigate external threats. For more information, visit the SECURE SERVER SIP page. Sample source code also demonstrates how to use methods and events to secure your SIP server.
How can I access the PCM audio data of a call?
VaxVoIP offers two ways to access the audio data of a VoIP call in real time. For details, see the ACCESS AUDIO PCM page. Sample source codes also include implementations for accessing call audio data in real time.
Which audio codecs are supported?
We offer support for a variety of audio codecs, including GSM, iLBC, G711u-Law, G711a-Law, and G729.
Which operating systems are supported?
VaxVoIP SIP Server SDK is designed exclusively for Microsoft Windows, supporting all Windows Server and Desktop versions.
Optimized for Multi-Core and Multi-Processor Systems
VaxVoIP SIP Server SDK is optimized to utilize all CPU cores, efficiently distributing workloads across multi-core and multi-processor systems for enhanced performance.
Is Call Recording Supported?
Yes, VaxVoIP SIP Server SDK supports call recording and saves conversations in standard WAV file format.
Can I Connect It with Other SIP Servers?
Yes, VaxVoIP SIP Server SDK can easily connect with other SIP servers, PSTN gateways, and gatekeepers. See our TECHNICAL MANUAL for details.
Can we use it in call centers?
Yes, it’s ideal for developing call center services such as dialing, reception, queuing, call transfers, call parking, call pick-up, barge-in, and silent monitoring.
Can I develop stealth listening feature?
For a comprehensive understanding of developing the stealth listening feature in your VaxVoIP SDK-integrated SIP Server, Please refer to the SAMPLE source code.
Do you sell the source code of SDK?
Yes, the source code of our SDK can be provided with user rights only. Additionally, training on the source code can also be provided.