Had some problems with auto re-pairing issue with the PTI. I had to re-pair this manually each time. A software upgrade was not possible due to a faulty module.

Found a useful program (Bluetooth profiler) on the internet to change the default settings (profile) of the paired devices. When this program is installed on your Iphone there is an option to enable the sensor. When sensor is enabled the repairing is done automatically. This program can only be installed on a Jailbreaked
I’m using this now for over a week without any problems with repairing en calls.

Wanted to share this information with you. Its works for me.