How can I monitor Facsimile/400 and know when it stops sending faxes?

["Danny Lacerte" <danny_lacerte@xxxxxxxxxxxx>]

Hello everyone, here's my situation:
We are using Facsimile/400 on a IBM System i and sometimes it just
stops sending faxes. Everything seems in order but the faxes just pile
up with a "Sending" status. 
This is an intermittent problem that cannot be provoked manually so I
want to come up with a program that checks that the fax is still
running.
Here are the problem's symptoms when it happens:
In CHKFAXSTS, all the faxes have the "Sending" status
The QFFSNDFAX output queue is empty
The QFFSNDERR output queue is filled with the currently sending faxes
and the previous faxes in error

Now how can I know that the fax is still sending faxes?
I can get the list of the spooled files in QFFSNDERR and check if a
spooled file is lingering there too long, but how can I know it's status
is "Sending"? - I don't want to catch the faxes that have a wrong fax
number etc.
Thanks, every suggestion is welcome.