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MicroSIP

Lightweight and reliable SIP softphone for Windows

MicroSIP is a SIP softphone for Windows designed for everyday business communication and professional VoIP use.

Connect to any SIP provider or PBX system and make high-quality voice and video calls from your desktop. Whether you work in an office, remotely, or manage your own SIP infrastructure, MicroSIP provides a simple and dependable communication solution without unnecessary complexity.

Screenshots

screenshot Main screenshot Calls screenshot Contacts

Why MicroSIP

  • Reliable and actively maintained
  • Lightweight and efficient
  • Compatible with SIP standards
  • Suitable for office communication, remote work, and VoIP environments

Designed for real-world communication

MicroSIP is commonly used with:

  • Office PBX systems
  • SIP service providers
  • Remote and hybrid work environments
  • Customer support and service desks
  • Small business and professional VoIP deployments

Compatibility

MicroSIP works with standard SIP infrastructure, including SIP providers and PBX systems.

Supported and commonly used with:

  • Asterisk-based PBX systems
  • FreePBX deployments
  • 3CX environments
  • Any SIP-compliant provider or server

Built on the proven PJSIP stack and designed for standards-based SIP interoperability.

screenshot Account screenshot Menu

Features

Voice and video communication

High-quality voice calls
  • Video support (H.264, H.263+, VP8, VP9)
  • DTMF support (In-band, RFC2833, SIP INFO)

    • Messaging and presence

  • SIMPLE messaging (RFC 3428)
  • Presence support (RFC 3903, RFC 6665)

    • Security

  • TLS encryption for SIP signaling
  • SRTP and DTLS-SRTP for media protection

    • Audio quality

    Supports a wide range of codecs including:

    Opus, G.711 A-law and μ-law, G.722, G.721.1, G.723, G.729, GSM, AMR, AMR-WB, iLBC, Speex, SILK, and Linear PCM.

    Additional audio features include WebRTC-based echo cancellation and voice activity detection.

    Lightweight and portable

  • Small footprint (from 12 MB)
  • Low memory usage (from 7 MB)
  • No external dependencies
  • Portable configuration stored in an INI file

    • Accessibility and localization

  • Compatible with screen readers such as NVDA
  • Multilingual interface with support for numerous languages
  • Right-to-left (RTL) language support
    • screenshot Settings

    Ongoing development

    MicroSIP is actively maintained and continuously improved to ensure compatibility with modern Windows versions, SIP infrastructure, and evolving communication technologies.

    The project focuses on reliability, standards compliance, performance, and long-term usability.

    If your business relies on MicroSIP, you may consider supporting its continued development to help sustain ongoing maintenance and improvements.