I am trying to communicate with a Nokia 6310i phone via Bluetooth. Apparently Nokia doesn't use standard and/or do not sharing sufficient AT-command information for me to connect to the phone in a full mode.

The main problem is to detect the phone state. All other phones support AT+CPAS to detect the state. Most other phones also support a proprietary AT-command so the phone sends an
unsolicited command when the phone changes state. The states are Ready, Calling, Connected.

I have not been able to find any such command for the Nokia 6310i or for that matter the other Nokia phones.