VOIP H323 DLL Soft Phone SDK brings H.323 protocol support for ActiveX. With this SDK one can create a simple program to connect and start speaking with anyone with a direct IP Address or use the Gateway or the Gatekeeper to connect to /or from PSTN lines. Now VOIP open source projects have made it easier to implement a customized VOIP Solution eliminating costly PSTN lines.

Telepati SIP Phone Freeware allows you to make PC-PC phone-phone calls over the Internet. Developed using Research Labs VOIP SIP Phone SDK, this free soft phone brings SIP protocol support for ActiveX. With this phone once you set the gatekeeper proxy with the username and password from your providers, you can connect and start speaking with anyone on the internet.

Add life to chat! Loco4chat is a free add-on software for any chat & VoIP application. It lets you play over 150 funny sound clips during chat and VoIP (Voice over IP) conversations. You can add any of your audio files and even record your own funny voices. Loco4chat is 100% free and supports Live Messenger, Yahoo Messenger, Skype, AOL AIM, ICQ, QQ, GTalk, Xfire, TeamSpeak, Ventrilo, Camfrog, Sipphone, Express talk & Paltak. Have fun :-)

Embedded Windows CE VOIP Developers Kit is your embedded telephony solution for developing software/hardware to enable device to device phone calls using SIP/H323 phone right at the electronics level. The design is based on Hybrid Combination of RFC SIP Protocol and Windows RTC and is today successfully ported to Windows CE/Pocket PC/Smart Phone.