Blink Pro is a state-of-the-art, easy-to-use multimedia SIP client. It is elegant, intuitive to use, and feature-full.
For support go to http://projects.ag-projects.com/projects/blinkc/wiki/Help_For_Blink_Pro Features OSX Integration (iCloud, iTunes, Address Book, Keychain, Voice Over) Audio (Opus codec) optimised for full spectrum audio Video (H.264 codec) supporting HD 720 @30fps Acoustic echo cancelation, no headsets needed Presence (SIP SIMPLE RLS and XCAP protocols) Instant Messaging and File Transfers (MSRP protocol) Screen Sharing (Apple VNC over MSRP protocol) Multiparty conferencing (audio, chat and file transfers) End-to-end chat encryption (OTR protocol) End-to-end audio and video encryption (ZRTP protocol) Corporate directory services (LDAP protocol) Compatible with telephony applications (dialpad, call hold, call transfer) Fine-grained settings for SIP experts