If you are a Gizmo5 and Google Voice subscriber, this app will basically turn your iPad/iPod touch into a phone, realistically for outgoing calls. Add your Gizmo SIP account, then add your Google Voice account. This app will then use the callback method when you use the keypad, quickdial favorites or contact list (from within the app). No need to set up backgrounding. I've made free calls back to the United States from overseas using this app. It's not a telephone replacement (you can't dial 911 from this setup), however paired with a pay-as-you-go dumbphone, it's an effective way to cut your phone bill massively.This review is identical to the one I'm giving to Acrobits Groundwire. I didn't realize the two apps were so similar; for the scenario described above Acrobits Softphone is quiet adequate. There is no difference in call quality.

Clearly abandonware - very unfortunate.—-****How about an iPad formatted, universal version, upgrade?****---Upgraded to 5 stars for g.729 support, and a slew of additional, excellent enhancements - not to mention the developer keeps improving and supporting an excellent VoIP client. I wish I could give him more $$$ ;-)---Upgraded to 4 Stars for supporting calling straight over 3G. Woohoo!----I run my own PBX in a Flash home and office PBX, and have been looking for an appropriate client on iPhone. This does the job, and it does it very well. Some suggestions for enhancements that would catapult this well into 5 stars territory:- support for the G.729 codec for even better quality. Yes, G.729 costs money to license - make it an in-app purchase. I would gladly pay an additional $5 or so for that feature. - allow customizing the ringtones- add custom quick-buttons for VM, for example. - aesthetic changes of the look and feel to bring it more in line with the native look of an iPhone phone app, than some avant garde retro design experiment (allow selection of different skins, to appease avant garde retro afficionados). Maybe make skins an in-app purchase. ;-) Do these, and a shining 5 stars, and more money, will be yours ;-)

I spent a lot of time looking for the best SIP client for my iPhone 4S and I can honestly say that I did the right thing choosing Acrobits. Even though it is not cheap compared to other apps, it is worth every penny. The number rewriting feature is amazing, I can't believe I ever lived without it.Most of the negative reviews seem to be from users without much VoIP or SIP knowledge. If you are an advanced user or just know enough to understand how to set up your SIP account and that the call quality depends on how good your network is, I definitely recommend this app. I don't think there is a better SIP client for iOS and they are always releasing new versions.

I’ve tried almost every Softphone in the IOS ecosystem. While some have slightly better GUI’s than others, few actually have working reliable push features to notify you when your phone is sleeping or locked. This is one of themI do see regular updates come thru, so development and patching is still happening, which is nice to see. I could see the devs improving the gui a little, and allow ringtone uploads, but overall, this Softphone mostly fits my needs and works well

This has proven to be immensely useful while traveling. While in the U.S. I have a local SIM with unlimited voice&data, and can easily point my "native" number to SIP calls, and have Acrobits Softphone notify me when I have an incoming call to my native cell - without hanging in the background and eating battery. Purchasing g.729 codec might seem to be expensive but 100% worth it. One missing feature I'd like to see is ability to set "route to SIP" in the app (e.g. for Megafon). Otherwise really appreciate the amount of work put in this truly useful app.

Well, I have been using this app a quiet a long time and I realized that it has less then 5 star and got surprised. Incoming calls with Push is amazing. You get to use your VoIP on 3G flawless (maybe they are the first one offered this). I recently purchased Bria to see if there is anything exciting because of their star rating, but honestly nothing new or better. So I decide to write this review. I would highly recommend this app over other paid apps. I wish there was iPad specific version.

I was trying to find an app that would let me record incoming and outgoing phone calls. A lot if the apps that claim to do that don't work at all. Found a website that mentioned this app and it had the best reviews. Also said it worked with Google voice. After downloading I tried to add my Google voice account but it continually told me my email and password were wrong; they weren't though. Frustrated I looked online to see if I was doing anything wrong and found out I HAD to have a SIP provider in order to use Google Voice with this app. It's probably my own fault I didn't realize this to begin with but everything else I read lead me to believe I could use this with only a Google Voice account if I chose to do so.

Kudos to Acrobits devs for fixing the crashing on iOS 3.x fairly quickly. We've been using this app for a while and although I find startup is slower than iSIP (can be an issue on incoming push calls), the UI is more polished and the options are more than we will ever use. Voice quality is great as always. And the continued support for older versions of iOS is very welcome. Great product and my choice over other SIP applications.

Excellent call quality. The g.729 add on is well worth the cost if you have a marginal wifi connection, nobody could tell that I was using VoIP. Google Voice integration is excellent and seamless. This is my back up phone when the cell signal goes away in a few of our buildings. Highly configureable settings, so if it doesn't work, it is most likely that the pre-set settings don't work for your case. Watch the videos, especially on how to configure google voice to work with your SIP account.

The best SIP softphone ever. Excellent debug logs solved many problems (of my own making) related to NAT and codecs. Most feature-packed softphone available! Great work! I've even paid for your g729 codecs. I'm a SIP expert, and you've done it right!I almost left 4 star because it's not universal app for iPad. Please make this a universal app! Basic things like orientation have been lacking for a long time. Cosmetic, I know, but it isn't that hard. It's what's under the hood that counts, so I still gave 5. Great app nonetheless!