The packaged getty won't answer the phone for you (like, say, Gert 
Doering's mgetty package will) -- set your modem parameters using 
ats0=1 
(for one ring, ats0=2 for two...) and store the
settings in your non-volatile ram with 
at&w0 
finally, make sure your modem uses configuration 0 when it starts
at&y0

these work for most modems I've seen.  Your mileage may vary.

-l

   Date: Fri, 7 Jul 1995 08:08:30 -0300
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    and neither one of them were able to make the modem answer to the external call. The modem's behavior was just light the led (auto answer I think) when the phone rings.

    Thanks for some hints ! :)

    Ricardo Ferraro