A few weeks ago Counterpath released a version of their Bria SIP soft phone specifically for the Android platform. This was one of the factors that influenced my purchase of a T-Mobile G2. I’ve had the G2 for a few weeks and have been mostly very pleased with the device. My twitter stream has reflected various experiments using it during recent travels.
Counterpath was good enough to provide a licence for their Bria SIP soft phone which dovetails nicely with my employers OnSIP hosted PBX. As I have been travelling a bit these past few weeks I’ve not made much use of Bria until very recently.
For an in depth look at Bria on Android you should look at the OnSIP site as the staff over there have posted a nicely detailed review. They report some crashing of the application, which has not been my experience but I expect that the user experience varies with hardware platform.
Around my home office, and on my local Wifi, I find that Bria Android Edition is stable and reliable. It seems to handle calling extensions local and remote without any NAT issues.