problems with fax receiving...

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Hello,
I'm trying to setup fax server on my linux box by  using mgetty+sendfax
package (version 1.1.19 from RedHat 5.1 distributive). Now, I can send
faxes without any problems and I can receive faxes from other modems.
But mgetty can't  make fax connection while trying to receive fax from
fax machines. It waits for connect string and doesn't recognize fax
machine call. That's the content of my mgetty.log file:

01/30 16:52:10 yS0  mgetty: experimental test release 1.1.19-Nov24
01/30 16:52:10 yS0  check for lockfiles
01/30 16:52:10 yS0  locking the line
01/30 16:52:10 yS0  lowering DTR to reset Modem
01/30 16:52:11 yS0  send: at&f1[0d]
01/30 16:52:11 yS0  mdm_send: 'ATI'
01/30 16:52:11 yS0  non-numeric ID string: 'at&f1'
01/30 16:52:11 yS0  mdm_send: 'AT+FCLASS=2.0' -> OK
01/30 16:52:11 yS0  mdm_send: 'AT+FAA=1;+FCR=1' -> OK
01/30 16:52:11 yS0  mdm_send: 'AT+FBO=1' -> OK
01/30 16:52:12 yS0  mdm_send: 'AT+FNR=1,1,1,0' -> OK
01/30 16:52:12 yS0  mdm_send: 'AT+FLI="7 812 2340310"' -> OK
01/30 16:52:12 yS0  mdm_send: 'AT+FCC=1' -> OK
01/30 16:52:12 yS0  waiting...
01/30 16:52:13 yS0  wfr: waiting for ``RING''
01/30 16:52:14 yS0  send: AT+FAA=1;A[0d]
01/30 16:52:14 yS0  waiting for ``CONNECT''
01/30 16:53:34 yS0  timeout in chat script, waiting for `CONNECT'
01/30 16:53:34 ##### failed timeout dev=ttyS0, pid=1576, caller='none',
conn='',

I use US Robotics 33600 Voice modem.
There is ati7 command output below:

Configuration Profile...

Product type           US/Canada External
Options                V32bis,V.FC,V.34+
Fax Options            Class 1/Class 2.0
Clock Freq             92.0Mhz
Eprom                  256k
Ram                    64k

EPROM date             3/20/96
DSP date               3/20/96

EPROM rev              2.0
DSP rev                2.0

OK
AT+FCLASS=?
0,1,2.0

OK
AT+FCLASS=2
OK

What's the difference between fax
machines and fax modems? What parameters in mgetty.config file should I
change to correct fax receiving?
Thanks a lot for replies,
best wishes, Serge.