From NCH Software:
Express Talk lets you make VoIP sip video calls to users anywhere in the world. Call PC to PC for free, all you need is Express Talk installed on each machine, a webcam plus a microphone and speakers. This easy to use softphone lets you see and speak to family and friends all over the world for free. Upgrade to the Business Edition for 6 lines, call recording and more. Features: Supports computer to phone via a VoIP SIP gateway provider.Supports caller ID display and logging. Includes a phone book with quick dial configuration. Integrates with Microsoft Address Book. Supports emergency numbers calling (such as 911, 999, 000). Includes data compression (GSM, uLaw, ALaw, PCM and G726), echo cancellation, noise reduction, and comfort noise. Supports video (H263, H261) for Webcam and Video IP phones.
Version 3.10 improves tooltips for toggled sidebar buttons, general layout to make UI more friendly/easy on the eyes, and conference mode to handle mute, hold, and record.