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1,000 - 5,000 downloads

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Groundwire, the leading Business SIP Client is now available on Android. Packed with all the features a business user needs, Groundwire makes taking your office line with you everywhere a breeze. Check out all these great features, with more coming soon.

•Push Notifications for incoming calls for improved battery life
•Call Conferencing
•Transfer and Attended Transfer
•Call Forwarding
•Bluetooth headset support
•Secure calling through SRTP (SDES)
•ZRTP support (through in app purchase), the latest in secure calling for SIP
•Support for use on wifi and 3G networks
•backgrounding support with status bar notification; check your email or other tasks while still available for calls on the Softphone
•GoogleVoice interface, originate and complete GoogleVoice calls all from one app (requires GoogleVoice account and SIP Account with incoming U.S. numbers)
•quick import of accounts from major VoIP Providers
•call recorder and player, seamlessly integrated into the call history
•Bluetooth headset support
•HD Wideband audio through G.722
•excellent sound quality, includes the G.711 (ulaw and alaw) and GSM audio codecs. Make an in app purchase to add G.729 Annex A for great quality over 3G networks
•TLS support for encrypted SIP
•audio codec manipulation, enabling you to prioritize the codecs used and disable ones you don’t want to use
•comfortable and super-smooth user interface, fine-tuned specially for Android
•easy, intuitive 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
•Android contacts integration. Easy to call anyone in your contacts via SIP
•add new contacts directly from Groundwire
•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
•configurable RTP port range
•SIP Proxy support
•STUN server support, automatic service discovery using DNS SRV queries
•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

The Android Market does not make paid apps available in all countries.  If you're unable to purchase Groundwire, please visit for an alternate method to download and install.

Groundwire is a SIP Client, not a VoIP provider. It needs to be used in conjunction with a VoIP provider that supports use on a SIP Client to work. Check out our list of verified VoIP operators at

VoIP over 3G - Be aware that some mobile network operators prohibit or restrict the use of VoIP (Voice over Internet Protocol) over their network. They may prohibit the use of VoIP or impose additional fees and/or charges when using VoIP over their network. By using Groundwire over 3G, you agree to abide by any restrictions your cellular carrier imposes and agree that Acrobits will not be held responsible for any charges, fees or liability imposed by your carrier for using Groundwire over their 3G network.

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Recently changed in this version

- improved audio compatibility on Android 4.3 and newer
- power optimizations for better battery life
- design changes: new icons, cleaner design
- many small bug fixes and improvements

Comments and ratings for Groundwire
  • (53 stars)

    by Aaron Botti on 23/10/2014

    The phone works very well, as advertised. However even though it is not running it causes a error every time I use my mobile phone to make a call. Unfortunately once I'm connected on my mobile I cannot hangup or do anything else on my phone until I clear the error.

  • (53 stars)

    by Carl Chernih on 23/10/2014

    Works well on Samsung Galaxy Note II, Sony Xperia LT26i, Samsung Galaxy SIII, Samsung Galaxy Note 10.1, Sony Xperia Z1, but crashes on Samsung Galaxy SII Plus. As a notice to developers: in previous versions it was more comfortable to see if app fails to connect to SIP server (I mean green and red icons in Android status bar). It looks nice, but not clear to understand instantly if there is any pr

  • (53 stars)

    by Jan Mahoney on 16/10/2014

    Groundwire + SIP enables me to free myself from mobile networks outrageous charges

  • (53 stars)

    by Rajpreet Singh on 05/10/2014

    after updating android to 4.4.2 new version close every time while receiving call on gsm

  • (53 stars)

    by Allan Jaslow on 29/09/2014

    Really time for a Material Design refresh to the interface. Menu key and sometimes cryptic methods of performing actions, like deleting a SIP account, should be revised. As should last image showing version number in Play Store. Also, the ability to disable the confirmation exit dialog box via one time checkbox should exist, especially for those who have push notifications enabled. From a function

  • (53 stars)

    by Ahmed Elayan on 29/09/2014

    A new update yet still the same old lousy design.. This app used to be the best in SIP communication, now not so good. One of the simple things that needs to be updated is the menu key on 4.3 and above which I've emailed then about long time ago. And the design is very old which should be updated. Call quality isn't as good as I used before. Finally there should be away that I get the app which I

  • (53 stars)

    by Stan Grishin on 17/09/2014

    Decided to check back on the app which I've bought in the beginning of 2014 and submit a review. As I don't use ZRTP nor G.729, for me the biggest feature of Groundwire or a smaller sibling from Acrobits -- Softphone was the push notification. It works very well if you're not concerned about sending your SIP credentials to a small company in Czech Republic. Ultimately tho, the push notifications