[Khairullah]

at first i need to say sorry for my english which is not that good to describe my problem i think. but i will give my best in hope to get some help here.
i got a mercedes e200 w212 with aps 50 anda nokia n900. i read that though sap profile does not exist calling through bluetooth should work. unfortunately it does not for me and maybe someone here got a clue about what the problem is. 
connecting the phone to the aps50 works without any problems. but the moment i try to make a phone call the connection starts to get something like hiccups. i can hear the voice through the speakers of the car but there are lots of hiccups. i mean some words just get lost. the other side can hardly me and most times can not hear me at all. i tried it with my old htc p3600 phone and it works perfectly. but as explained the moment i try it with my n900 handsfree speaking is no longer possible. 
please help me out. i searched google as crazy and i tried several german forums where no one could help me. 

please help me obi-wan you're my last hope...

[Khairullah]

hello???

[Mick_H1]

Hi Khairullah.

I did read your first post, but as I'm not lucky enough to own a Merc of any type I decided not to answer. And I guess no one else on here has that model vehicle, which is probably why they haven't answered.

It's a common problem that one phone will work with a certain model of car and not with another.

An N97 user reported, on another forum, that his Bluetooth worked faultlessly with his Ford hands-free, until he updated his phone to the latest firmware. Turns out he needed to update his in-car Bluetooth. A quick visit to a Ford dealership solved his problem.

The problem you describe sounds like something in the car's electronics/ignition system is causing the problem. Have you contacted Mercedes to see if they can throw some light on the issue? With the N900 being a relatively new device it takes time for the device updates to filter through the industry.