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The following information is what I have been able to glean from other contributor’s posts; I have not seen this done myself, and would welcome any feedback.

The MY ’03-’04 E Class and ’04 S-Class were equipped with a PSE that combined the Tele-Aid and cell phone support equipment into one unit called the CP-211. All that is necessary in these cars is to “activate” the cell option with STAR diagnosis, and add the proper V60 cradle (kit Q 682 0882 for the S-Class; Q 682 0828 for the ’03 or ’04 E-Class). In addition, the E-Class phone bulletins indicate that a linear compensator and cable are necessary (only for plug-in operation, I would add), and the ’03 E-Class requires an Audio 50 firmware update.

Once the activation is done, a Bluetooth “Puck with Tail” is used for cars with a cradle. This puck differs from the puck used in other ’00-04 cars.

In addition, the new "Cradle replacer" as discussed in the two preceding posts and V60 puck can also be used with the CP-211 platform; this is a particularly easy solution if the car does not already have a V60 cradle.

A caveat for owners of cars other than the E-Class and S-Class discussed in this section: The V60 cradle for the '03-'04 E-Class and '04 S-Class does not use the same connectors as the V-60 cradle for other models, and it should not be substituted unless you can get the adapters that are necessary. In addition, I have no idea what the outcome of adding a CP-211 PSE to an earlier car that still had its original Tele-Aid equipment in place. Although it may be possible to take the OE Tele-Aid out of the fiber optic loop, I don’t know if the CP-211 can be made to work in installations for which it was not designed.