VaxVoIP SIP Phone SDK — Develop your Own VoIP Softphone

The VaxVoIP SIP Phone SDK is a robust development toolkit designed to help you quickly build branded, cross‑platform VoIP softphones. It provides full control over features and UI, letting you deliver tailored communication apps for desktops and mobile devices.

Key Capabilities

• Multi‑Account & Multi‑Line Handling: Seamlessly support multiple SIP accounts and concurrent calls.
• Rich Media Features: Includes audio and video conferencing, call hold/transfer/forwarding, and integration with any SIP server, gateway, or ITSP.
• Advanced Audio Processing:
  • Supported codecs: G.711u, G.711a, GSM 6.10, iLBC, G.729
  • Features like acoustic echo cancellation, automatic gain control (AGC), adaptive jitter buffer, and packet loss concealment (PLC) ensure clarity and smooth performance.
• Communication Enhancements:
  • Record calls in WAV format, play pre‑recorded audio files during calls
  • Voice changer effects (e.g., robot, chipmunk, helium voice)
• Instant Messaging & Presence: Built-in support for SIMPLE (SIP Instant Messaging and Presence Leveraging Extensions) including chat and status capabilities.
• Automated Calling Enhancements: Include intelligent answering‑machine detection for use in auto‑dialers.
• Do Not Disturb (DND): Ability to block incoming calls when needed.

Try It Before You Buy

The SDK includes a fully functional 30‑day free trial, giving you access to sample code, demos, and documentation for easy evaluation.

Why It Stands Out

With its comprehensive feature set, seamless multi-platform functionality, and complete codec and media support, the VaxVoIP SIP Phone SDK dramatically accelerates softphone development. It is ideal for businesses seeking full flexibility, rich communication features, and high-quality VoIP performance.