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I had the transport mode problem. When I called bmw assist, it just froze, saying 'call active, receiving data' or something. The service dept quickly set it right.
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So it could be that the transport mode is a data bridge between the iBus and the GSM module to allow remote diagnostics.
So what is E-CALL, and why does it have control of the BT?
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he ConnectedDrive system now offers a new service called the BMW Advanced eCall. The BMW Advanced eCall is designed to provide the emergency services with detailed information about the type of collision and injuries in case of a crash probability even before they arrive on the scene of an accident. This gives them the possibility to prepare better for the situation.
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Source. Some sort of dial up modem for the car then.
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Figure 3.1: Summary of procedure modules for e-Call certification
Certification procedures are related to the nature of the product / system to be
considered but also to its step in its life cycle (see the figure 3.2 below).
The nature of the product / system is related to the e-Call system supply chain
organization which distinguishes mainly the five following stakeholders!
¾ The e-Call equipment suppliers which are developping and producing the
Telematics Control Units (called e-Call TCU) in charge of processing the eCall trigerring events and executing the e-Call functions conforming to
standards. Such component will be fully integrated in a car and can become
part of the In-Vehicle system.
¾ The car manufacturers (OEM) or e-Call system suppliers (for the after
market) which are integrating an e-Call TCU in an In-Vehicle system
(connection to the vehicle electronics to detect an incident event; connection
to the vehicle HMI, mainly the audio chain; connection to the roof antennas;
.etc.). OEM are then producing e-Call equipped vehicles...l
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So I wonder if an E-CALL trumps BT for resource from the mic and speakers, hence disabling pairing and connection. Try Shift+F9 and a battery-off reset.