3CX Phone System for Windows Free
Free VoIP PBX - 3CX Phone System for Windows
Free VoIP PBX - 3CX Phone System for Windows
WiFi Phone,screensaver,Home Phone Service
T.38 Fax/Voice modem for SIP/H.323/ISDN CAPI
Embedded Windows CE VOIP SIP Developers Kit
Freeware VOIP SIP Soft Phone
Free VoIP Phone. Use with any VoIP Provider
SIP SDK provides tools
VoIP H.323 SDK for .NET and ActiveX
Speaking answering machine
Internet phone to make calls on your Mac OS X