Blink Lite is an easy to use SIP client with wide-band VoIP, Chat, File Transfer and Screen-sharing capabilities. For OPUS codec, iCloud account synchronisation, iTunes pause and resume, unlimited number of accounts, call history, call recording, call transfer and more usability features see Blink Pro. * High Definition VoIP (G.722 and speex codecs) * PSTN Telephony (G711, GSM and iLBC codecs) * Speakerphone with echo cancellation * Support for external USB microphones and speakers * Address Book integration * Telephone Keypad interface * Presence (RLS and XCAP) * Instant Messaging (MSRP protocol) * File Transfers (MSRP protocol) * Contacts Management (XCAP protocol) * Screen Sharing (VNC over MSRP) * Multi-party conferencing * Keychain password storage * Voiceover support Known interoperability issues: http://projects.ag-projects.com/projects/blinkc/wiki/KnownIssues Beware that there is no upgrade path between Lite and Pro versions of Blink, they are different applications.