There is a way to extend the run-on time, done through the phone book entry (I found this while trying to get a 6310i working in my 02' S320, which I still cannot do).
The entry name needs to be in German
"NACHLAUFZEIT" which means RUN-ON TIME I am told, my Germans not that good.
For the phone number, enter a figure between 1 and 60 (I assume this is minutes), which apparently is the max, any thng outside this and it defaults to 10.
I do not know if this works, or how to test it, but it is in the MErcedes documentation that came with my car.
do let me know if this was nonsense or of it does work.
If I can get my phone to work, I would have tried this prior to posting a reply.
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