Blink is the best real-time communications client using the SIP protocol.
You can use it with many SIP providers, on the LAN using Bonjour and with SIP2SIP, a free service.
Elegant, simple to use and feature-full
Available for Windows and Linux and on the Mac App Store for OSX
Get the addressbook plugin for OSX
Mobile Versions
Blink for Mobile is available for iOS and Android, this version only works with SIP2SIP.
Features
Voice and Video
- Studio Audio Quality (Opus codec)
- HD Video (H.264 codec)
- Acoustic Echo Cancellation
- End-to-end Encryption (ZRTP)
IM & Presence
- Chat Sessions (MSRP)
- End-to-end Encryption (OTR)
- Presence (SIMPLE)
- Server Storage (XCAP)
File Transfers
- File Sessions (MSRP)
- Encryption (TLS)
- Progress Reports
- Delivery Confirmation
Screen Sharing
- Help Family Remotely
- Collaboration at Work
- Surf Internet Together
- Integrated with Audio
Conferencing
- Manage Participants
- VoIP, IM and Presence
- File Transfers
- Screen Sharing