I try to use bluetooth to connect to my mobile sony ericsson T610 to
connect to my office network using dial-up networking. I can see that
the mobile is trying to dial to my office number, but drops quickly
and my dial-up networking in my PC always shows error 678. Is there
any configuration to be set (e.g. adding a init string?)

See More: Error 678 when using bluetooth to connect to T610