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.

We need your help! Show your support for CallButler and donate now.


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.

Search for things that are hard to describe at

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