I am using the Acrobits SIP client with an Asterisk pbx here at work. We do not allow access from outside of the LAN, so I cannot register with your push server. I have been using it with moderate success with Backgrounder, however. The problem is that when Acrobits is active, it takes complete control over the phones system sounds, so that no other programs (IM, email, sms, etc) notification sounds work. Is there anything that can be done about this? Other programs that work in the background don't have this behavior - ie. if Pandora is running in the background I still get notification sounds.
I realize that this is not really a supported use, but it goes a long ways towards making it a fully usable program for me.
Though Acrobits Softphone is not tested with jailbroken phones, we have been notified of this issue from several users with jailbroken phones and hope to have a solution for our 3.1 release.