Blink Pro is a state-of-the-art, easy-to-use multimedia SIP client. It is elegant, intuitive to use, and feature-full. It can be used without an account on the LAN, or can be configured to use SIP accounts from any service provider. Free account sign-up to SIP2SIP free service is also provided in case you don't have a SIP account.

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