Bluetooth (with SAP) - wiring harness - Audi A5 8T

The data of the SIM card are read via SAP and used by the interface while the cellphone is in standby mode.
The call is to be arranged by the phone interface with stronger transmission.

Comparison to cenventional in car telephone:

• Minimal use of the battery of the cellphone, also while talking.
• No harmful radiation inside the car.
• In comparison with a cellphone the integrated GSM module is obviously stronger and more reliable, especially at high speed.
• Strong digital processing of signals reduces echo and noise interference.
• You don't need a 2nd SIM card like with a conventional in car telephone.
• Shows SMS messages in the MMI. 
• The call is to be arranged by the phone interface with stronger transmission.