e39 Euro 900mhz gsm phone by motorola pinout.

[Bnn747]

Hi Bmw e39 1996 520i.Euro.
The wiring of the gsm phone I look for the pinout to understand the i-bus function.
25 pin transceiver 8 pin handset + interface for i-bus function?
Connection (telephone + mid multi information display + cluster) pinout schema connection.
I believe the connection is the same also for American versions as well.
Thank you.