Acrobits - softphone

One App to rule them all

Amir Hanan

Groundwire, Business Caliber SIP for the iPhone

Our latest addition to the App Store is the first mobile SIP client capable of replacing your desktop phone.  Jam packed with all the features you've come to expect from SIP devices and desktop softphones, you may find yourself using it more often than your office and mobile phone lines combined.  Supporting both multitasking functionality of Apple mobile devices and the original Acrobits Softphone's reliable Push Notification Service, you'll be able to customize Groundwire to fit your precise needs. 


  • New - Video Calling Click here for a demonstration
  • Multitasking background support for iOS4 and later
  • Transfer and attended transfer
  • Push Notifications, a reliable way to receive calls when Groundwire is closed
  • Multi line
  • Call Waiting
  • Conference Calling
  • Voicemail support, be advised of waiting voicemail and call your voicemail with a single touch
  • Enterprise SMS support through SIP SIMPLE
  • SMS Support for betamax providers, pennytel and sipme
  • Call Forwarding
  • Web Callback and Call through for your native GSM number
  • GoogleVoice integration
  • Customizable ringtones, choose from our selection or pick something from your iTunes library
  • HD wideband audio through G.722
  • Support for Opus codec, narrowband and wideband
  • 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
  • NAT Bridge Service, for solving audio issues over 3G
  • Background noise suppression and echo suppression
  • In-call Quality Indicator, see network quality, packet loss and jitter
  • 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 to automatically format your incoming numbers to match your existing contacts
  • TLS support for encrypted SIP
  • SRTP, both SDES and ZRTP for secure audio on SIP calls, check out our knowledgebase article for more details
  • Bluetooth support for iPhones iPad 2 and iPod Touch 4th Generation
  • Audio codec manipulation, enabling you to prioritize the codecs used and disable ones you don't want to use with separate settings for wifi and 3G
  • 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 contact via SIP
  • Contacts search function
  • Add new contacts directly from Groundwire
  • 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, rfc2833 or SIP INFO)
  • Speakerphone support
  • Detailed call history, with intelligent call grouping for an easy overview
  • Support for sip:username URIs in contacts
  • Configurable RTP port range
  • IPv4
  • SIP Proxy support, VPN support
  • Quick import of accounts from major VoIP providers, including Gizmo5, sipgate, voipcheap and many more
  • Phone number resolution, we present the phone numbers in a convenient format with grouped digits, display the flag and country name and even the region/city name for some countries, including USA

Remember, Groundwire is a SIP client.  You will need to have service with a VoIP provider or PBX that supports use on a standard SIP client to use it.

GoogleVoice users:  Though we have integrated GoogleVoice, Groundwire's main use is as a SIP client.  You can set up Groundwire to initiate GoogleVoice calls through other types of numbers, but to get the full functionality of Groundwire, you need to have GoogleVoice linked to a SIP Account.