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Bluetooth Hands Free - Some Answers

52050 Views 61 Replies 28 Participants Last post by  DBSLK
Okay. Thanks to everyone that replied, it helped make this information quest a little easier. After numerous enquiries around the Internet, I think I have all the answers I need. If I've made any mistakes, please feel free to chip in. Mods, I'm not sure if this is worth a sticky, but it might help clear up some of the questions on here! Here goes.....

New 2008/2009 Models

1. These cars come with Bluetooth as standard. This means you can, without ordering any special extras, take any Bluetooth compatible phone and enjoy some level of functionality, be it simple hands free or extensive use of the cars controls and COMAND interface.

2. The level of functionality available for some phones and the standard Bluetooth fit is listed at this website:

Select your country, then car class, then "Bluetooth Connectivity", then "Compare All" to see a list of features

3. The Bluetooth protocol used for this standard Bluetooth fit is HFP. This simply means that your car will talk to your phone and share some of its features. Using this system, phone calls are made through the phones antenna, not the cars. The phone is effectively 'live'. This integrated system replaces the functionality of the Bluetooth HFP cradle:

4. If you wish to use the cars antenna to make calls (this way the signal is boosted) you can do one of two things. Either a) Buy the correct cradle for your phone (if it exists) - a decent list of available cradles can be found here:

or B) use a different sort of Bluetooth. By purchasing one of these:

your car will use the SAP Bluetooth protocol (be aware that there are two generations of this product. You want Version 2). The difference being that the car will take ownership of your phone, and place it into a hibernation state. The car effectively downloads all the information from the SIM card in the phone and uses it to conduct telephony. Again, be aware that not all phones support the SAP protocol. It is part of the Bluetooth Version 2 specification which is becoming standard amongst newer phones. Nokias seem to be the best supported. To the best of my knowledge, Apple hasn't adopted it yet. Another point to note is that irrespective of who makes your phone, 3G models will not work with the SAP protocol. They can still be used with the HFP protocol however - that is to say, the standard Bluetooth fit.

Both methods will allow the use of the cars antenna and maximise the feature set available to you in the car. This should include, amongst others, reading and replying to text messages on the COMAND interface should you have it. To view a list of features available when using a phone specific cradle, visit:

Select your country, then car class, then "Comfort Phone System", then "Compare All" to see a list of features.

5. To use either of the cradle types, you must have Optional Extra 386 - Telephone Pre-Wiring installed. Mercedes assures me you do not need any of the other options (388 - Universal Interface, for example) installed.
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I've read somewhere there's some menu to adjust bluetooth receiving and transmitting volumes. (-2, -1, 0, +1, +2). It should be used to compensate for the variety of bluetooth devices and their "default" volumes.

I have a pre-facelift ntg1 comand. Does anyone know where i can find this?

I know i can adjust the volume on the device itself and with the volume control on the radio. It seems it isn't enough to get an acceptable volume.

If there is a menu then I guess it is somewhere in an engineering mode menu. Don't have a NTG1 anymore but when i had I can't remember I ever ran across that option. Do a Google search with "engineering mode NTG1" and you will get lots of hits how to enter engineering mode.

Besides, the NTG1 does not support BT for telephone, only for attaching a BT headset to make calls more or less private.
Your phone has a BT connection with the puck so if there is a adjustement it should be there. I seem to remember that the ViseeO MB2 had that option.
Your Comand knows not better then that there is a phone installed in the UHI cradle. It has no knowledge of a BT connection with the phone.
Hmm.. that's a shame. It sounds quite logical. The bluetooth is comming from the puck.

I tried engineering mode. Don't know what to do with it. It only shows information and stuff like "flash memory". I see no options to change anything specific.

I ordered some cables for my viseeo mb-2 and will try to update it.

Thank you for your insights.
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