Hi,
Thanks for answer!
I've read the articles, and realized, that any BT stack doesn't support now any inbound voice streaming (from phone to pda), but does support outbound (from pda to bt headset).
The conclusion is: x50v's bt stack has the technology of transfer data enough for voice stream, but this function is not working, because nobody realized it to be needed.
I have a hope that it will work some day....