SipLine icon
SipLine icon

SipLine

Free, native Windows SIP softphone with HD audio, SRTP encryption, multi-account support and a C# Plugin SDK. Works with any SIP provider.

SipLine screenshot 1

Cost / License

  • Free Personal
  • Proprietary

Platforms

  • Windows
SipLine screenshot 1
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SipLine screenshot 3
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Features

  1.  VoiP Calls
  2.  SIP client
  3.  SIP
  4.  Call recording
  5.  Encrypted VoIP calls
  6.  Voice Chat

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SipLine information

  • Developed by

    FR flagFeelAutom

  • Licensing

    Proprietary and Free Personal product.

  • Pricing

    One time purchase (perpetual license) ranging between $9 and $19.

  • Alternatives

    0 alternatives listed

  • Badge

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  • Supported Languages

    • English
    • French
    • German
    • Spanish
    • Italian
    • Portuguese
    • Dutch
    • Polish
    • Romanian
    • Russian
    • Ukrainian
    • Swedish
    • Turkish
    • Arabic
    • Hindi
    • Indonesian
    • Chinese
    • Japanese
    • Korean
    • Vietnamese

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SipLine was added to AlternativeTo by Franck Pichard on and this page was last updated .
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What is SipLine?

SipLine is a free, native Windows SIP softphone built with .NET 9 WPF for professionals who need reliable, secure VoIP communication. Unlike browser-based or Electron alternatives, SipLine starts in under 0.5 seconds with minimal CPU usage.

It features HD audio with Opus and G.711 codecs, military-grade encryption (TLS for signaling, SRTP for voice, DPAPI for credentials), and works with any SIP provider or IP-PBX — 3CX, Asterisk, FreePBX, OVH, Twilio, RingCentral, Keyyo, and more.

SipLine supports up to 5 simultaneous SIP accounts, professional headset integration (Jabra, Poly, Sennheiser, Logitech) with HID controls, call transfer via SIP REFER, and real-time call quality monitoring (MOS Score, Jitter, Packet Loss, RTT).

What sets SipLine apart is its C# Plugin SDK — developers can build custom integrations for CRM systems, call recording, SMS messaging, and automation. A built-in Plugin Marketplace offers community and premium extensions.

Enterprise features include silent MSI installer with GPO support, JSON-based centralized configuration, white-label option, and GDPR-compliant EU hosting (France/Germany). Plans range from free (Community, no time limit) to custom Enterprise with unlimited workstations.