I may be wrong, but I believe the VOIPo app is to control the features of your phone, like VPanel. It is not a softphone. However, I agree, Acrobits seems to work fine as a BYOD solution.
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Bria for iPhone rocks! Latest version supports G722 and G729 codecs. Who needs a cordless phone at home? One phone to rule them all . . .
I'm using Whistle Phone with Voipo settings. Is Bria better? This is on an iPad.
I've not tried Whistle. Bria started out as under-featured relative to other VOIP apps but has added features over time. I think it is one of the most feature rich apps now. Prior to bria adding the additional features I found Groundwire from Acrobits (their other app is Acrobits Softphone). I find both Groundwire and bria to be excellent apps.
Disclaimer - I have an iPhone 3GS running iOS 4.1. I have no experience with an ipad or iPhone 4.
I use LINPHONE on my ipod touch and it works great and best of all it's free!
I think the program is a spawn of a lynix version.
Didn't care for the PC version of LinPhone. I think on the PC side X-lite still seems to be the best.