mgetty ppp stallion problem

[User Ernie]

Something I have been meaning to post about but kept forgetting.

I have a FreeBSD 4.9-STABLE machine with a stallion card 
stl0: <EC8/32-PCI> port 0x7400-0x7403,0x7800-0x7807,0x8000-0x8003,0x8400-0x8407 irq 11 at device 12.0 on pci0
stl0: EC8/32-PCI (driver version 5.6.0b1) unit=0 nrpanels=1 nrports=16



It's acting as a modem server running mgetty+sendfax from the ports collection
MD5 (mgetty1.1.30-Dec16.tar.gz) = 4b80c418bc58add3e40de3be0ac6c02a

mgetty is set to spawn off a user ppp session which it does quite well, but 
every now and then when the caller hangs up the ppp session stays active so 
the serail port is unusable. If I do a kill on the ppp session the ppp
process dies but the sertial port on the stallion card does not free up and 
a reboot is required.

The megetty.config is as follows:

debug 6
data-only YES

 speed 57600
 port-owner uucp
 port-group network
 port-mode 0666
 toggle-dtr YES
 toggle-dtr-waittime 500
 direct NO
 blocking NO
 modem-type data
 init-chat "" ATS0=0Q0&D3&C1 OK
 modem-check-time 3600
 rings 2      
 answer-chat "" ATA CONNECT \c \r
 answer-chat-timeout 80 
 autobauding NO
 ringback NO
 ringback-time 30
 ignore-carrier false
 prompt-waittime 500
 login-prompt @!login: 
 login-time 240

It's almost as if ppp is not sending the right signal to release the serial 
port back to mgetty.

Any ideas?

- Ernie.