4. One unexpected side effect of porting is the process terminates your account at ATT. This included my DSL. I did not know this. I called ATT and once the account is gone its gone. No way to restore my DSL without starting over. The best ATT could do is create a new account and it take 5 business days to get new service. I called COMCAST and was able to get internet service in two days (it helped that I had a cable modem already). Bye, bye ATT.
When I did research on switching, I found this documented in many places, surprised you missed it. I had gotten rid of AT&T DSL prior, so it wasn't an issue for me, but the local $30 per month bill is now gone.
7. Complicating matters is my monitored alarm system. I had to run the phone line from the OBI into the security system box. That was a simple matter of finding the right two wires from the ATT line into the house and splicing in the wire from the OBI. I don't know if the monitoring still works. I will test that later. Worse case is getting a cell based monitoring system (which of course is more reliable).
Many alarm companies make you sign a statement that you know that VOIP monitoring is not reliable and may in fact not work, as was discussed recently on other posts. The issue is not in getting a dial tone, the issue is that in transmitting the data, VOIP is not reliable to properly connect and transmit to your alarm company's panel.
If you're going to use this setup, you need to ensure you've wired it properly. With an alarm system, the phone wires come in from the outside and usually go into the alarm box, where they are wired onto a block. That block wires into the alarm panel. When the alarm is activated or tests itself, it seizes the internal phones, cutting them off, to get the phone line and make the call. The proper way to wire the OBi would be to have it take the place of the incoming AT&T wires by removing them from the block and attaching the two OBi wires. This is easily done by cutting the end of a regular phone cord and taking the red and green wires and attaching them, then plugging the other end into the OBi.
Keep in mind that you likely have a discount from your insurance company for having a monitored alarm system. Knowingly having a connection that is not tested, or may not in fact work, might be of issue to them should you suffer a loss during the period.