Actually the Profile is testing for when the phone goes idle. It fires every time, but I have not tested a drop call condition (waiting for it to happen.) Since it is checking for when the phone enters an idle condition (line disconnect), it should still notify me when the phone disconnects from the network. I'm going to try just the vibrate function to see if I can notice the diconnect. Maybe the disconnect will be less noisey...
I am really getting back into Tasker! I dropper off for a while to use Motorola SmartActions. However I found it too buggy and causing more issues than it was worth. Since coming back to Tasker, I am more excited and doing more than the last time I used it. I've been spending time searching the web for different ideas to get more out of it. If I see anything else interesting, I will be sure to post it here...