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Project Description
CallButler is a FREE Windows-based open source PBX, IVR and Auto-Attendant Phone System built on .NET. It was a commercially available product, but is now being put into Open Source.

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Recommended Phone Service
We recommend the following Internet/VoIP phone service providers for CallButler:



If you would like your VoIP business listed here, please send us an Email and let us know.

  • PBX
  • Auto-Attendant
  • IVR
  • Voicemail
  • Music On Hold
  • Text to Speech
  • Find Me/Follow Me
  • Call Forwarding/Transfer
  • Call Recording
  • Conferencing
  • Call Personalization
  • Unified Messaging
  • Windows Based
  • Outlook Integration
  • CRM/SFA/ERP/Database Integration
  • 10 Minute Setup





Compilation/Debugging Notes
  • Requires VS.NET 2005 (with SP1)
  • In order to debug CallButler in VS.NET you'll need to start the CallButler Service.exe with the command line argument, "-a" (without the quotes). This will start CallButler as a desktop application as opposed to a Windows Service. You can specify command line arguments in the Properties for the CallButler Service project.

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Last edited Aug 20, 2009 at 10:40 AM by Alphamacaroon, version 14