A state of the art, easy to use SIP client
Available for Mac, Windows and Linux

Blink Pro for MacOSX

Blink client provides real-time communications including audio, video chat, presence, file transfer and screen sharing using SIP protocol.

Blink Pro is available from the Mac App Store. Changelog is available here.

Blink Pro and Blink Lite differences

Compared to Blink Lite, Blink Pro has a faster release cycle and extra features:


An overview of the implemented standards is available here.


  • Simple use, your father can use it
  • Multiple SIP accounts
  • iCloud account syncing between multiple computers
  • Keychain support for encrypted password storage
  • Built-in SIP account sign-up at
  • Handle TEL and SIP URLs clicked in other applications
  • Voice Over accessibility support

Contacts Management

  • Integrates System Address Book
  • Server Storage (XCAP protocol)
  • Directory search (LDAP protocol)
  • Bonjour neighbours (MDNS protocol)
  • Automatic backups

Audio Sessions

Demo movie
  • Wideband Opus and G722 codecs
  • Narrowband G711 and GSM codecs
  • Answering machine
  • DTMF support
  • Silent mode
  • Call recording
  • Call transfer
  • Call waiting
  • Mute microphone
  • Message Waiting Indicator (MWI)
  • ICE NAT traversal
  • Web page integration with caller information
  • Displays RTP end-point information
  • Displays codec, packet loss and RTT
  • Telephone dialpad
  • ZRTP encryption
  • End-to-end encryption zRTP encryption

Multiparty Conferencing

Demo movie

Blink can conference audio calls locally. For more media types and advanced conferencing features, a conference server is required. Blink supports the following server side conferencing features:

  • Ultra-wideband Audio (using Opus codec)
  • Conference Information (conference-info event package)
  • Add/remove Participants (out-of-dialog REFER method)
  • Instant Messaging (MSRP chatroom support)
  • File Transfers (MSRP file transfer support)
  • Screen Sharing (JPEG streaming over MSRP)

Dialing Out

  • Support for SIP addresses and telephone numbers
  • Strip unwanted characters from telephone numbers: (0) blocks, spaces, - and ()
  • Replace leading + sign from phone numbers with a numeric prefix per account
  • Custom prefix for outgoing calls to phone numbers
  • Automatic DTMF sending after connect with # as delimiter
  • Automatic account section for outgoing calls based on dial plans
  • Automatic fail-over to next next-hop when available
  • Redial for the last call

Accept/Reject Calls

  • Automatic accept calls
  • Displays the caller icon and name retrieved from Address Book
  • Rejects calls with 486 Busy (other devices keep ringing) or 603 Decline (all devices stop ringing)
  • Can accept partial offers when INVITE contains multiple streams
  • Speech recognition for alert panel commands
  • Speaks incoming caller name

Missed Calls

  • History
  • One click Dial from the History menu
  • Growl notifications

Chat Sessions

  • Based on MSRP protocol with TLS and MSRP relay support
  • End-to-end encryption using OTR and SMP protocols
  • Privacy settings for local and remote storage of messages
  • Individual message delivery reports
  • Composing indication
  • Emoticons
  • Rich text support


  • Based on SIP MESSAGE method
  • Emoticons

File Transfers

  • Based on MSRP protocol with TLS and MSRP relay support
  • Displays transfer speed and remaining time
  • NAT traversal using MSRP relay

Screen Sharing

  • MSRP protocol with TLS and MSRP relay support
  • VNC RFB protocol


  • SIP, DNS, RTP, MSRP and XCAP protocols trace to file or window


  • SIMPLE protocol (Presence Agent mode)
  • Policy Management (XCAP)
  • RLS Services
  • Offline status
  • User Icon


  • H.264 codec
  • Resolutions: VGA and HD720p @30fps
  • ZRTP encryption

Note: available features may vary depending on OS type and version.