flexfax: REMOTE HANGUP: Unspecified Transmit Phase B error (code 20)

["Tnu Samuel" <tonu@spam.ee>]

I cannot get Hylafax working :(

My configuration:
Modem USR Sportster 33,6k external w/o voice
16550 fifos

And this is sending log:
May 05 01:52:03.88: [ 2674]: SESSION BEGIN 00000003 37266406490
May 05 01:52:03.90: [ 2674]: SEND FAX: JOB 2 DEST 6406490 COMMID
00000003
May 05 01:52:03.90: [ 2674]: DELAY 2600 ms
May 05 01:52:06.50: [ 2674]: <-- [17:ATE0V1Q0X4S0=0H0\r]
May 05 01:52:06.64: [ 2674]: --> [16:ATE0V1Q0X4S0=0H0]
May 05 01:52:06.64: [ 2674]: --> [2:OK]
May 05 01:52:06.64: [ 2674]: <-- [32:ATS8=2S7=60&H1&I0&R2S13=1&D2&C1\r]
May 05 01:52:06.78: [ 2674]: --> [2:OK]
May 05 01:52:06.78: [ 2674]: <-- [14:AT+FCLASS=2.0\r]
May 05 01:52:06.93: [ 2674]: --> [2:OK]
May 05 01:52:06.93: [ 2674]: <-- [9:AT+FLO=2\r]
May 05 01:52:07.06: [ 2674]: --> [2:OK]
May 05 01:52:07.06: [ 2674]: <-- [9:AT+FPP=0\r]
May 05 01:52:07.20: [ 2674]: --> [2:OK]
May 05 01:52:07.20: [ 2674]: <-- [9:AT+FBO=0\r]
May 05 01:52:07.34: [ 2674]: --> [2:OK]
May 05 01:52:07.34: [ 2674]: <-- [10:AT+FCT=30\r]
May 05 01:52:07.48: [ 2674]: --> [2:OK]
May 05 01:52:07.48: [ 2674]: <-- [15:AT+FNR=1,1,1,1\r]
May 05 01:52:07.62: [ 2674]: --> [2:OK]
May 05 01:52:07.62: [ 2674]: <-- [9:AT+FIE=0\r]
May 05 01:52:07.76: [ 2674]: --> [2:OK]
May 05 01:52:07.76: [ 2674]: <-- [23:AT+FCC=1,5,2,2,0,0,0,0\r]
May 05 01:52:07.90: [ 2674]: --> [2:OK]
May 05 01:52:07.90: [ 2674]: <-- [5:ATM1\r]
May 05 01:52:08.03: [ 2674]: --> [2:OK]
May 05 01:52:08.04: [ 2674]: <-- [14:AT+FCLASS=2.0\r]
May 05 01:52:08.27: [ 2674]: --> [2:OK]
May 05 01:52:08.27: [ 2674]: <-- [9:AT+FLO=2\r]
May 05 01:52:08.51: [ 2674]: --> [2:OK]
May 05 01:52:08.51: [ 2674]: <-- [9:AT+FPP=0\r]
May 05 01:52:08.75: [ 2674]: --> [2:OK]
May 05 01:52:08.75: [ 2674]: <-- [9:AT+FBO=0\r]
May 05 01:52:08.99: [ 2674]: --> [2:OK]
May 05 01:52:08.99: [ 2674]: <-- [10:AT+FCT=30\r]
May 05 01:52:09.23: [ 2674]: --> [2:OK]
May 05 01:52:09.23: [ 2674]: <-- [15:AT+FNR=1,1,1,1\r]
May 05 01:52:09.47: [ 2674]: --> [2:OK]
May 05 01:52:09.47: [ 2674]: <-- [9:AT+FIE=0\r]
May 05 01:52:09.71: [ 2674]: --> [2:OK]
May 05 01:52:09.71: [ 2674]: <-- [23:AT+FCC=1,5,2,2,0,0,0,0\r]
May 05 01:52:09.95: [ 2674]: --> [2:OK]
May 05 01:52:09.95: [ 2674]: <-- [26:AT+FLI="Tradenet Systems"\r]
May 05 01:52:10.19: [ 2674]: --> [2:OK]
May 05 01:52:10.20: [ 2674]: DIAL 6406490
May 05 01:52:10.20: [ 2674]: <-- [16:ATX3DT06406490@\r]
May 05 01:52:52.28: [ 2674]: --> [4:+FCO]
May 05 01:52:55.02: [ 2674]: --> [25:+FNF:P+FCI:"         +37]
May 05 01:52:55.02: [ 2674]: REMOTE NSF "P+FCI:"         +37"
May 05 01:52:55.02: [ 2674]: -->
[48:6406490"+FIS:1,3,0,2,1,0,0,4ÐFmi5=ݽ늦®“¿˜‡]
May 05 01:53:35.02: [ 2674]: REMOTE HANGUP: Unspecified Transmit Phase B
error (code 20)
May 05 01:53:35.02: [ 2674]: SEND FAILED: Unspecified Transmit Phase B
error
May 05 01:53:35.02: [ 2674]: SEND FAILED: Unspecified Transmit Phase B
error; too many attempts
to send
May 05 01:53:35.03: [ 2674]: <-- [5:ATH0\r]
May 05 01:53:35.26: [ 2674]: --> [4:ATH0]
May 05 01:53:35.26: [ 2674]: --> [2:OK]
May 05 01:53:35.27: [ 2674]: SESSION END


What can be wrong?

    Tõnu