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

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开发者_如何学编程.

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.

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Here's the approach I used:

I found the table QUSRSYS/QAFQSND, which contains the complete list of faxes as they can be seen in CHKFAXSTS.

With a SQL query, I can now check if there are faxes on the "Sending" status for too long.