You're welcome Donald. The cradle is the issue, at least as far as the M-B "workaround" or conversion to Bluetooth is concerned. I think if you have the Timeport phone system, you will need to look at the Argos system.
By the way, I have a Motorola Razr too, and everything that the car has for phone functions work perfectly (steering wheel volume and answer/hangup controls, keypad on my COMAND, microphone/speakers, mutes radio or CD when you dial or answer, download of phonebook entries - I think that is all).
I have forgotten where you buy the Argos systems, but if you look on the Audio & Telematics sub-forum here, you will find MORE than you ever wanted to know about M-B phones!