Groundwire, the first full featured mobile SIP client for the iPhone! Acrobits' latest addition to the App Store is the first mobile SIP client capable of replacing your desktop phone. Jam packed with all the features youve come to expect from SIP devices and desktop softphones, you may find yourself using it more often than your office and GSM lines combined. Supporting both the new iOS4 multitasking functionality of Apple mobile devices and the original Acrobits Softphones reliable Push Notification Service, youll be able to customize Groundwire to fit your precise needs. Features: Multitasking background support for iOS4 Transfer and attended transfer Push Notifications, a reliable way to receive calls when the Softphone is closed Multi line Call waiting Call Grouping Conference calling Customizable ringtones, choose from our selection or pick something from your media library shake gesture support, the most convenient way to switch between active calls without even looking HD Wideband audio through G.722 excellent sound quality, includes the G.711, GSM and iLBC audio codecs. Make an in app purchase to add G.729 Annex A for great quality over 3G networks Completely redesigned audio optimized for the best VoIP experience on the iPhone Number rewriting, enabling you to utilize your existing contacts without having to create new entries to satisfy the dialing requirements of your PBX or SIP provider Address Book Matching, make sure incoming calls match the correct contact TLS support for encrypted SIP Bluetooth support for iPhones with OS 3.1 and higher (please note that the iPad and iPod Touch do not support Bluetooth Hands Free) audio codec manipulation, enabling you to prioritize the codecs used and disable ones you dont want to use call recorder and player, seamlessly integrated into the call history comfortable and super-smooth user interface, fine-tuned specially for the iPhone full localization (currently English, Chinese, Danish, Korean, Norwegian, Polish, Portueguese, Swedish, French, German, Italian, Russian, Spanish, Czech and Slovak) very easy configuration simultaneous registration of multiple SIP accounts, have multiple accounts registered to receive incoming calls and switch the account used for outgoing calls without leaving the keypad iPhone contacts integration. Easy to call anyone in your contacts via SIP Contacts search function, search your contacts by name or number add new contacts directly from the softphone Quickdial, your 12 favorite contacts are one touch away ability to generate DTMF tones while in call, to control various PBX features or automated systems (use audio, rfc 2833 or SIP INFO) speakerphone support detailed call history, with intelligent call grouping for an easy overview support for sip:username URLs in phonebook configurable RTP port range SIP Proxy support, VPN support STUN server support, automatic service discovery using DNS SRV queries quick import of accounts from major VoIP Providers, like Gizmo5, Voipcheap, TerraSIP and others phone number resolution. We present the phone numbers in a convenient format with grouped digits, display the flag and country name and even region/city name for some countries, including USA Check out the videos below to see this amazing SIP client in action. http://www.acrobits.cz/tutorials/call-waiting-and-conferencing-on-groundwire/ http://www.acrobits.cz/tutorials/transfer-and-attended-transfer-on-groundwire/ Questions, comments, experiences, feature requests, bug reports etc. are welcome in this thread.