About & Pics


Acrobits Softphone, the perfect app for entry into the world of SIP.
*** Featuring Video calls over Wi-Fi and full CallKit integration.

Check out the video tutorial and knowledgeable article at the links below.



With loads of preconfigured providers and an extremely intuitive user interface, Acrobits Softphone is simple to configure and a delight to use. Designed for ease of use but still extremely customizable, Acrobits Softphone is both the perfect Softphone to ease new users into the world of SIP and a reliable, feature rich client for veteran VoIP users.

Business users and veteran VoIP users should also check out our business caliber SIP Client, Groundwire. Just go to More iPhone Apps by Acrobits and click on Groundwire. It contains all the features of Acrobits Softphone and more.

“Acrobits Softphone is one of the best designed VoIP on the iPhone applications available today.”

Read more: http://bit.ly/vB6dQ9

“Acrobits Softphone is my New Favorite VoIP SIP Client”

Read more: http://bit.ly/a69OZP

For the list of providers and VoIP services tested with Softphone, see http://www.acrobits.cz/about-us/partners#tab_verified-voip-operators

- Push Notifications, a reliable way to receive calls when Acrobits Softphone is closed or in the background
- WiFi Finder add-on lets you search for a nearby wifi in a database of many millions of wifi hotspots around the world
- Call recording (only available for SIP calls, will not record calls made from your GSM line)
- Backgrounding support
- Bluetooth headset support (iPhones only)
- Customizable ringtones
- Video calls, H263 and H264 codecs
- Quickdial, your favorite contacts only one tap away
- Quick import of accounts from major VoIP providers
- Excellent sound quality, supports Opus, G.722, G.711, iLBC and GSM. Make an in app purchase to add G.729 for great performance over cellular networks
- Highly configurable settings
- Native Contacts Integration
- SIP traffic diagnostic log for troubleshooting

Acrobits Softphone fans, please rate Acrobits Softphone or leave a review.

NOTE: WiFi Finder add-on is a subscription which will auto-renew monthly at the same price as your initial monthly payment (USD 0.99 or equivalent). Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period. Your auto-renewal can be turned off and your subscription can be managed by going to your Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. See https://www.acrobits.net/addons/terms.php?id=addon.wififinderautorenew for Terms of Use.

If you have an issue with Acrobits Softphone, please contact our support even if you leave a review stating the problem. We are unable to respond to reviews so even if your issue is simple to resolve, we have no way of letting you know. Acrobits Softphone is highly configurable so problems that seem insurmountable may just require a couple of adjustments to the settings.


SIP - Acrobits Softphone is a SIP Client, not a VoIP service. You must have service with a VoIP provider that supports use on a standard SIP client to use it.

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

 $6.99 in iOS App Store


Acrobits Softphone screenshot 1Acrobits Softphone screenshot 2Acrobits Softphone screenshot 3Acrobits Softphone screenshot 4

Version History

Launched Jul 02, 2009 (about 10 years ago).

Releasing new versions every about 2 months, on average.

May 16
Version 5.9.15

Maintenance release. Fixes a bug when calling a number from history tab.

May 14
Version 5.9.14

- the delay before audio is connected after an incoming call is answered is significantly reduced
- fixed an audio issue which might have caused a helium-voice effect after a switch between Wifi and cellular network
- bug fixes, stability improvements

Mar 25
Version 5.9.13

Maintenance release. Minor bug fixes and stability improvements.

Mar 08
Version 5.9.12

- fixes an issue with wrong caller id displayed in case the incoming call contains Diversion header

Mar 04
Version 5.9.11

- improved Opus codec quality.
- DTMF digits can be sent when call is on hold
- added support for Diversion: SIP header
- emoji keyboard now showing properly
- improved translations
- many small GUI, performance and stability improvements

Dec 05
Version 5.9.10

maintenance release. No new features, only fixes for several gui glitches and stability improvements.

Nov 30
Version 5.9.9

- customisable fonts (Settings->Preferences->Appearance)
- fixes for several GUI glitches, mostly related to iPhoneX screens (with notch)
- work-around for a bizarre iOS12 bug where a recent voice call makes system camera app unable to focus (!)
- various small fixes and stability improvements

Oct 14
Version 5.9.8

maintenance release. Fixes for several bugs introduced in the previous update:
- proximity-based speaker phone was not working - fixed.
- DTMF tones were not sent correctly when using CallKit and native in-all screen
- history search string is remembered between app restart, but after restart, the field is not populated. This makes the history filtered, but search string is not visible, which is confusing.
- iPhone X, XS layout issues fixed

Sep 26
Version 5.9.7

Maintenance release. Fixes for a few bugs introduced by the previous update:
- creating new quick dial items fixed
- SIP display name was not shown on incoming call screen
- long press on quick dial page not handled properly

Sep 23
Version 5.9.6

- iOS 12 compatibility
- GUI facelift
- small bug fixes and stability improvements

Jul 25
Version 5.9.5

- additional ipv6 compatibility improvements
- balance checker was not working reliably after app start - fixed
- vibrate effect on 3D touch
- correct sending of images in messaging (no cropping)

Jun 27
Version 5.9.4

improved ipv6 compatibility. This update should fix calling issues in mobile networks in Canada and USA.

May 24
Version 5.9.3

- fixes an occasional problem with speakerphone button during the call
- GDPR compliance

Apr 24
Version 5.9.2

Maintenance release. Fixes some minor bugs and stability issues caused by the previous update.

Apr 15
Version 5.9.1

WiFi Finder add-on: Search for a free wifi around you in a database of many millions of wifi hotspots around the world.

Jan 09
Version 5.9

- improved iPhoneX compatibility
- changed logic of picking 20ms vs. 30ms iLBC mode
- T9 search bug fix: some search results were not clickable
- several missing translations added
- improved h264 video quality

Oct 31
Version 5.8.7

- iOS 11 Compatibility
- iPhoneX Compatibility
- other minor bug fixes and improvements

Aug 24
Version 5.8.6

- improved battery consumption when using "Standard" incoming call mode
- several minor bug fixes and stability improvements

Jul 10
Version 5.8.5

- new, ultra low-bandwidth voice codec: Codec2
- improved reliability of "Standard" incoming call mode on IOS 10.3 (for those who can't use push notifications)
- translations improvements and additions
- several small GUI improvements

May 22
Version 5.8.4

Maintenance release. Several small user interface fixes and improvements, stability improvements, some new translations.

Feb 16
Version 5.8.3

- CallKit fix: incoming calls arriving when the app was not running sometime had one-way audio
- correct way to disable CallKit support
- allow system ringtones for CallKit calls
- fixed: incoming VP8 video was broken on "plus" devices
- fixed: when switching contact sorting order from "first-last" to "last-first", the sections were wrong
- opus codec speed optimisations

Dec 13
Version 5.8.2

- CallKit and SiriKit integration improvements
- fix dialling of numbers which have DTMF codes appended after a pause (",") character
- fixes an occasional bug which led to a crash when entering history panel
- smooth animation of T9 search results (Settings->Preferences->Controls, T9 search)
- a separate button for dismissing in-call keypad. Swiping it away still works, but it may lead to an unwanted digit to be sent

Nov 14
Version 5.8.1

- SiriKit integration. Try "Hey Siri, call Mom using Groundwire"!
- CallKit improvements (like conferencing using iPhone GUI)
- Simplified incoming call modes. "Backgrounding" mode is no longer supported in iOS10+, so we now only have two: Push Notifications for extra battery efficiency (recommended) and Standard.
- Accessibility improvements (in-call keypad screen)
- Fixed some cases of no-audio when calling from native GUI
- Keypad was deformed on 5,5'' displays when using zoom mode. Not anymore.

Sep 23
Version 5.8

This version brings support for iOS 10 CallKit. It's now possible to call directly from iPhone contacts or history and quickly accept incoming calls right from the lock screen.

Sep 12
Version 5.7

- longer delays between DTMF digits for more reliable detection
- iOS7 compatibility improvements
- better handover between wifi and cellular networks
- ipv6 compatibility improved
- many minor improvements and fixes

Apr 24
Version 5.6.9

- GRUU support was not working in previous update. This is now fixed.
- some minor stability improvements

Apr 13
Version 5.6.8

Maintenance release: The previous versions of the app didn't handle situations when the device had more than 8 different IP addresses. This is becoming common with VoLTE. It made the app shut down when making or receiving a call and it's now FIXED.

Apr 05
Version 5.6.7

Maintenance release. The previous app had problems with date values read from address book. If you had anyone with two-digit year in birthday filled in (like 76 instead of 1976), the app failed to start. This has been fixed.

Mar 28
Version 5.6.6

- faster contacts tab, better integrated with the app
- improved T9 contact search when dialing
- 3D touch support!
- up-to-date with latest iOS versions, many small bug fixes and improvements

Oct 18
Version 5.6.5

- support for iPhone 6 and iPhone 6+ displays
- several iOS9 compatibility improvements
- improved ipv6 compatibility
- extended configuration of Opus codec options

Jul 26
Version 5.6.4

- improved voice quality when using G729 codecs on iPhone 5 and older devices

Jun 03
Version 5.6.3

+ support for higher video resolutions (up to full-HD 1920x1080)
bugfix: correct behavior when the app is launched to background

May 14
Version 5.6.2

- new contacts panel, which should solve various issues with previous system contacts

Feb 25
Version 5.6.1

- native support for 64-bit CPUs

Jan 28
Version 5.6

Bug fixes, stability improvements. Improved iOS8 compatibility.

Aug 03
Version 5.5.3

minor bug fixes, stability and design improvements

Jul 20
Version 5.5.1

- show account balance for providers which support it
- other minor bug fixes and improvements

Jul 07
Version 5.5

Version 5.5 brings new, modern, flat user interface

Feb 02
Version 5.4.3

- added support for GRUU
- minor bug fixes and stability improvements

Dec 04
Version 5.4.2

Maintenance release - bug fixes and performance improvements:
- preserves appearance settings between restarts

Sep 22
Version 5.4.1

- improved compatibility with latest iOS versions
- bugfix: betamax SMS
- other minor bugfixes and optimizations

Sep 12
Version 5.4

+ improve compatibility with latest iOS versions
+ modern app icon
+ minor stability and performance improvements
+ Updated settings for Pennytel users. Please delete and recreate your Pennytel account from the list of providers.

Apr 11
Version 5.3.3

- fixes in H264 video codec negotiation
- improved video quality
- improved performance of Opus voice codec

Jan 17
Version 5.3.2

- fixed credit balance for Betamax and Pennytel providers
- configurable dial actions (tap, long-press, double-tap)
- increased compatibility of Opus NB and WB codecs
- Japanese phone numbers properly formatted, with geographical information
- country picker is now showing after you dial "+"

Nov 14
Version 5.3

- support for iPhone5 screens
- new audio codec - Opus narrowband and wideband
- support for H264 video codec
- video over 3G now supported
- improved video compatibility with some VoIP providers
- zrtp speedup - up to 3 times
- bugfixes in zrtp multi-stream mode

Jul 02
Version 5.2

NAT Bridge is back!

May 16
Version 5.1.1

- ICE support
- video GUI improvements
- SIP stack bugfixes
- updated to the latest Pennytel SMS API

Previous 3 versions


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