This may be a dumb question, but I'm trying to understand what the purpose of the CTEL module is in the W221. I recently scanned my car and I have a fault code stating that this module is faulty. I do have the bluetooth puck in the armrest and my phone pairs fine with the puck and works through the system as it should. My voice command works also. The only thing I do notice is in the Navigation screen, under Data/Connection there is an option for Bluetooth which I can't seem to do anything with. Any input?

Thanks!

 

I know its a complicated module and I have exhausted my research online in regards to this module. I've only asked because I really haven't noticed anything not working in the car. Bluetooth pairs properly with the puck and works just fine with all controls. Phone system shows my contacts and recent calls as it should. Attached is a picture of what the fault code says.