My 8700 works but my wife's does not. Hers has the firewall settings locked by the company she works for. To get mine to work I just turned the firewall off.
On hers things work fine with incomming calls but it drops the hands free connection after about 5 seconds on outgoing calls. (This is all using bluetooth not a cradle)
The system is really neat when it works but I ended up haveing to get a second phone for her car so she now has a blackberry with one number that she carries and a second phone that I have just hidden in the car. It kind of defeats the whole purpose of bluetooth.
I strongly suggest that you take the car and try it first.
I spent about a week figuring out why my wife's wouldn't work and got no useful help from Mercedes, the dealership or Cingular.
Once you try to use a phone that they don't list and their list is several years behind the times, they don't feel any obligation to offer any help other than to buy a phone that you don't want and in my case wouldn't sinc up to her company's computer.
I strongly suspect that even buying an approved Blackberry wouldn't help in my suitation because the problem seems to be the Blackberry Enterprise settings not the hardware. I fully understand the IT peoples position and I wouldn't even ask them to turn the firewall off on her phone even if they were dumb enough to entertain the idea.
Sinse it works for a short period of time I suspect that the Mercedes Puck could be reprogramed to not require a periodic "handshake" with the phone but given my experience with Mercedes I don't think getting phones that they don't sell to work with their cars, is ever going to be a high priority for them so don't hold your breath.
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