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Acrobits Softphone is a VoIP client which uses Session Initiation Protocol, developed by Acrobits, a software development company based in Prague, Czech Republic. Acrobits Softphone is the leading SIP Client on the App Store, featuring push notifications and the G.729 Annex A audio codec, multitasking, Google Voice integration and encrytped calls through ZRTP.

History
The first version of Acrobits Softphone was released on the App Store in April 2009. Version 1.0 supported only a single SIP account and G711 and GSM codecs. During the following months, new updates were released rapidly, adding new features, and the app became quickly the most downloaded paid SIP app for iOS worldwide. Support for push notifications for incoming calls was added to Softphone in September 2009, shortly after push notifications were introduced in iOS3. The G729 codec was added in Apr 2010. In August 2010, a business-caliber version of Softphone called Groundwire was released on the App Store, adding support for conferencing, voicemail, call transfers, call forwarding and other advanced features of business-grade phones.

With the release of Groundwire, the app reached the level of maturity and completeness and attracted lots of interest from VoIP providers, who asked for white-label versions of the app, optimized and fine-tuned for their network only. Until now, around 50 different white-label versions were created. (apps per provider in App Store).

Later, these features were added to Softphone: ZRTP support (December 2010), NAT Bridge to help NAT traversal in difficult networking conditions (July 2011), support for video calls (Dec 2011), support for ICE (Mar 2012)

Acrobits Softphone for Android was released in Feb 2011, followed by Android Groundwire in Apr 2012. Android apps are now on par with their iOS counterparts, with the exception of video calls, which are not yet supported on Android.