Send fax using hylafax about modem or capi
faxsend
faxsend works as switch between the both ways: modem oder CAPI. If /dev/faxCAPI does exist it uses CAPI, otherwise it uses modem for sending a fax.
/usr/share/doc/capi4hylafax/README.html.
c2recv(1), capi4hylafaxconfig(8), hylafax(5)