So, weird one here.

Older 7100 MP10.

Out of the blue, the lines are getting tied up. Lines 1 and 2 start to ring at the same time. Try to pick up and it's just regular dialtone. If you don't pick up, it goes to voicemail and there is a short message that is just dialtone and it disconnects fairly quickly but then it happens again. Over and over.
Tried monitoring the line and the calls aren't originating from outside. When the trunks are disconnected from the pbx, no ringing. Flattened the database and it still does it.
Put the database back and it stopped for about 10 minutes but then started up again. Eventually I replaced the trunk card and that seems to have done the trick.

Anyone encounter something like this before?

-W