External modem issues with 5.3 - serial interface there, butaccessing it locks tip/cu up.

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Hi all,

I'm trying to get an external modem working under 5.3, without success. 
FBSD is detecting the serial port, and the device is in /dev (as cuaa0). 
  When I try to access the modem using cu or tip, as per the Handbook, 
both lock up.  I have not made any changes to /etc/ttys because I do not 
intend to have dial-in access (am I correct there?, and /etc/remote 
looks fine.  Any suggestions?

-- Stephen.