VOIP H323 Phone SDK
VOIP H323 DLL: Simple Soft Phone SDK
VOIP H323 DLL: Simple Soft Phone SDK
T.38 Fax/Voice modem for SIP/H.323/ISDN CAPI
Embedded Windows CE VOIP SIP Developers Kit
Freeware VOIP SIP Soft Phone
Simple, easy to use VOIP Auto Dialer.
Free VoIP Phone. Use with any VoIP Provider
SIP SDK provides tools
VoIP H.323 SDK for .NET and ActiveX
.Net SDK for VoIP call system development
Internet phone to make calls on your Mac OS X