flexfax: Hylafax queueing but not sending

[Christopher Biow <biow@ezmort.com>]

[note--the majordomo "welcome" message is in dire need of updating. It's
last updated April '96, has no explicit mention of "HylaFax" at all, and
points to http://www.vix.com/flexfax/. I'll volunteer to update it, if
nobody else wants to.]

Using hylafax-4.1beta1-1rh6.rpm under RedHat Intel 6.0, USR internal
Sportster Vi 28.8/fax modem. Installed fine, and test faxes worked from
local machine and remotely using WHFC.

Two days later, it still queues new faxes (local or remote) but they simply
don't send. Modem is doing fine and accessible with minicom. The jobs are
even dutifully removed from the queue at the expiration of their "attempt
to send" time. Everything that I can think of looks good--where do I go
from here in troubleshooting?

applicable parts of faxstat looks good:
|-> LIST status
|150 Opening new data connection for "status".
|HylaFAX scheduler on linux.ezmort.com: Running
|Modem ttyS1 (703.478.3807): Waiting for modem to come ready
|226 Transfer complete.
|-> LIST docq
|150 Opening new data connection for "docq".
|
|-rw----   1     root   109149 Nov 19 14:20 doc6.ps.6
|-rw----   1     root     5754 Nov 19 15:00 doc7.ps.7
|-rw----   1     root     5755 Nov 19 15:00 doc8.ps.8
|226 Transfer complete.
|-> RCVFMT
|200 %-7m %4p%1z %-8.8o %14.14s %7t %f
|-> PORT 127,0,0,1,4,16
|200 PORT command successful.
|-> LIST sendq
|150 Opening new data connection for "sendq".
|
|JID  Pri S  Owner Number       Pages Dials     TTS Status
|6    127 W  chris 1 678-441-01  0:0   0:12         
|8    127 W   root 478-3807      0:0   0:12         
|226 Transfer complete.

And it looks like the daemons are running
|[root@linux /root]# ps aux | grep fax
|uucp       522  0.0  1.3  3032 1792 ?        S    15:13   0:00 /usr/sbin/faxq
|uucp       524  0.0  1.0  2800 1372 ?        S    15:13   0:00 /usr/sbin/hfaxd -
|root       657  0.0  0.3  1152  440 pts/0    S    15:21   0:00 grep fax

/var/log/messages shows apparently normal startup during system boot,
SUBMIT, and timeout:

|Nov 19 15:13:45 linux hylafax: HylaFAX:
|Nov 19 15:13:46 linux hylafax:  faxq
|Nov 19 15:13:46 linux FaxQueuer[522]: HylaFAX (tm) Version 4.1beta1
|Nov 19 15:13:46 linux FaxQueuer[522]: Copyright (c) 1990-1996 Sam Leffler
|Nov 19 15:13:46 linux FaxQueuer[522]: Copyright (c) 1991-1996 Silicon Graphics, Inc.
|Nov 19 15:13:47 linux hylafax:  hfaxd (without old protocol or SNPP support)
|Nov 19 15:13:47 linux hylafax: .
|Nov 19 15:13:47 linux rc: Starting hylafax succeeded
|Nov 19 15:13:47 linux HylaFAX[524]: HylaFAX INET Protocol Server: restarted.
|...
|Nov 19 15:26:16 linux FaxQueuer[522]: SUBMIT JOB 9
|...
|Nov 19 17:20:54 linux FaxQueuer[522]: NOTIFY: bin/notify "doneq/q6" "timedout" ""

Where else can I look?