I updated my DIR-615 to the latest firmware. Little did I know I was going to ruin my day, my week and now a couple weeks.
My Alarm company NextAlarm.com lets me use a ABN (It's a Linksys PAP2)
A couple hours after I updated the firmware my Alarm started beeping with a trouble code. The code was a comm error.
This is where I started to learn about SIP....
I tried lots of things and finally I swapped out my DIR-615 for an old Linksys G I had laying around. Everything started working great! Put the DIR-615 back and it went offline again.
I have tired Enabling SIP in the ALG settings. I disabled it. I opened ports, I closed them. I tried everything.
Right now that PAP2 is sitting in the DMZ. Even that does not work!!!! How that can be is beyond me.
I want to stress that everything worked great before the firmware upgrade. I wanted to downgrade and was amazed to find out that I can't. Oh man. Now this is starting to Suck.

If anyone has any Ideas I would be willing to try anything. Even if it runs a chance of bricking my router, I could care less.
Thanks!