said by chagae:
I use voip.ms service for my home phone and iPad. I downloaded Bria apps on my iPad. Setups were completed and it works (in and out calls). However, Bria doesn't stay alive and I frequently missed incoming calls. Bria support knows the problem of with iOS6 and UDP "disconnection" with iPad and suggested to use TCP instead of UDP transport. I wanted to stay with voip.ms, so Bria made the suggestion to add PBxes service to convert from UDP to TCP. Before adding layers of services, I tried another app - Zopier using "forced background operation", with the same problem with incoming calls. Moreover, Bria and Zopier "staying alive in background" option significantly decrease battery life! Questions: 1) Is there an iPad 2 App that "really" works in background without draining the battery? Is TCP transport better than UDP to solve the incoming calls problem? Tks for your advice.
Any SIP app that is running in the background will significantly affect battery life.
The Acrobits app has a feature that will allow you to use APNS instead of having the app run in the background. Acrobits will maintain registration to voip.ms on their servers, then send you a push notification when you receive an incoming call. Since the iPhone is not maintaining the registration directly, this does not affect battery life much at all. When I have tried this feature lately, it worked pretty well.
The only downside with Acrobits is that it is not optimized for the iPad, but it should work just fine scaled up.