Phase B error

[Mario de Mello Bittencourt Neto <mneto@buriti.com.br>]

Hi there, I am trying to help a friend to set a fax server and I have
faced this error while trying to send a fax using senfax
-n -D -d xxx /tmp/foo (/tmp/foo plain text).

    Unspecified Transmit Phase B error; too many attempts to send

    ---- Transcript of session follows ----

Jan 30 17:27:01.65: [  732]: SESSION BEGIN 00000037 55832443849
Jan 30 17:27:01.65: [  732]: SEND FAX: JOB 27 DEST 2443849 COMMID 00000037
Jan 30 17:27:49.11: [  732]: SEND FAILED: Unspecified Transmit Phase B error
Jan 30 17:27:49.12: [  732]: SEND FAILED: Unspecified Transmit Phase B error; too 
many attempts to send
Jan 30 17:27:49.35: [  732]: SESSION END

    ---- Unsent job status ----

        CommID: 00000037
Submitted From: localhost
    Page Width: 215 (mm)
   Page Length: 279 (mm)
    Resolution: 98 (lpi)
        Status: Unspecified Transmit Phase B error; too many attempts to send
       Dialogs: 3 (exchanges with remote device)
         Dials: 0 (consecutive failed calls to destination)
         Calls: 4 (total phone calls placed)
         Pages: 0 (pages transmitted)


I use USR 28.8 Modems. This modem has successfully received fax and sent
messages to pagers (using sendpage).
I connects and then stops. 

Any ideias ?

Linux Box, HylaFAX(tm) 4.0pl1.

Thanks, Mario.