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介绍

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.