*** Featuring Video calls ***
Check out the video tutorial and knowledgeable article at the links below.

http://www.acrobits.cz/hesk/knowledgebase.php?article=62

http://www.acrobits.cz/91/video-calling-on-acrobits-softphone-and-groundwire

Designed from the ground up with the mobile user in mind, Groundwire is the first mobile SIP Client capable of replacing your desktop phone.  Combining all the features business users need (see below) with intuitive features created with the mobile user specifically in mind (number rewriting, address book matching, NAT Bridge and more), Groundwire will quickly have you wondering how you survived without it before.

Check out Acrobits Softphone as well.  Just click on Acrobits Softphone under More iPhone Apps by Acrobits.

Here's a list of our most popular features, visit http://www.acrobits.cz/index.php?id=11 for a full list of features.  

And check out http://acrobits.cz/index.php?id=25 for a side by side comparison of the most popular features of Acrobits Softphone and Groundwire.

*Video Calling - H263 and H264 codecs
*Multi line
*Call conferencing
*Transfer and attended transfer
*Call waiting
*Voicemail Notification and programmable Voicemail dialer
*Push Notifications
*ZRTP support (through in app purchase), the latest in secure calling for SIP
*enterprise support for SMS through SIP SIMPLE
*SMS support for betamax providers, pennytel and sipme
*iOS4 backgrounding support
*Call recording (only available for SIP calls, will not record calls from your GSM line)
*Google Voice integration, requires a Google Voice account and a SIP account with a DID (incoming phone number) to fully use this feature.
*Bluetooth headset support (iPhones, iPad 2 and iPod Touch 4th Generation only)
*NAT Bridge subscription for solving audio issues over 3G
*Customizable ringtones
*Quickdial, your favorite contacts only one tap away
*Number rewriting, edit your existing contacts for SIP dialing without creating additional entries and program specific number to be dialed through specific accounts automatically
*in-call quality indicator, see network quality, packet loss and jitter
*Background noise suppression
*Quick import of accounts from major VoIP providers including sipgate, callcentric, voipcheap and many more.
*TLS support for encrypted SIP
*SIP Proxy Support, VPN Support (configure VPN in iOS settings)
*Excellent sound quality, supports G.722, G.711, iLBC and GSM.  Make an in app purchase to add G.729 for great performance over 3G networks
*SIP Log for troubleshooting

Groundwire fans, please rate Groundwire or leave a review.  

If you have an issue with Groundwire, 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.  Groundwire is highly configurable so problems that seem insurmountable may just require a couple of adjustments to the settings.    

***NOTES - IMPORTANT, PLEASE READ***

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

Google Voice - 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.

VoIP over 3G - Be aware that some mobile network operators prohibit or restrict the use of VoIP 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.