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Download free VoIP SIP server and client for Windows.

OfficeSIP Server

Download Freeware OfficeSIP Server 2.7 (zip - 920 Kb)

ATT: Use Setup-2.x.exe (not .msi) for installation, installer download & install MS SQL Compact Edition (required, freeware).

System Requirements

  • Supported Operating Systems: Windows Server 2003; Windows Server 2008; Windows Vista; Windows XP; Windows 7
  • .NET Framework 3.5 SP1 (free download from Microsoft)
  • SQL Server Compact 3.5 SP1 (free download from Microsoft)
  • RAM: 512 MB (Minimun); 1024 MB (Recommended)
  • Display: 800 x 600, 256 colors (Minimum)
  • Processor: 400 MHz Pentium processor or equivalent (Minimum); 1GHz Pentium processor or equivalent (Recommended)

Tutorials

How to setup SIP server
How to configure DNS server for SIP server
How to configure Service Principal Names (SPN) on Windows Server 2008

OfficeSIP Messenger (Open Source)

Download from SourceForge: Messenger 2.0.1
Download from OfficeSIP: Messenger 2.0.1 (msi- or exe-installer)

OfficeSIP Softphone (Open Source)

Download from SourceForge: Softphone 1.0
Download from OfficeSIP: Softphone 1.0 (msi- or exe-installer)

System Requirements for Softphone and Messenger

  • Supported Operating Systems: Windows Server 2003; Windows Server 2008; Windows Vista; Windows XP; Windows 7
  • .NET Framework 3.5 SP1 (free download from Microsoft)
  • RAM: 256 MB (Minimun); 512 MB (Recommended)
  • Display: 800 x 600, 256 colors (Minimum)
  • Processor: 400 MHz Pentium processor or equivalent (Minimum); 1GHz Pentium processor or equivalent (Recommended)

OfficeSIP TURN Server

Download Freeware OfficeSIP TURN Server 1.0 (msi - 427 Kb)

System Requirements

  • Supported Operating Systems: Windows Server 2003; Windows Server 2008; Windows Vista; Windows XP; Windows 7
  • .NET Framework 3.5 SP1 (free download from Microsoft)
  • RAM: 256 MB (Minimun); 1024 MB (Recommended)
  • Processor: 400 MHz Pentium processor or equivalent (Minimum); 1GHz Pentium processor or equivalent (Recommended)

Freeware 3rd Party SIP Softphones

Old versions: