Thanks Mango and drgeoff,
After reading Mango's post, I realized that I forgot to disable the ObiTalk Service. I had disabled ObiTalk Provisioning, but not the ObiTalk Service. I had previously disabled it, but when I turned on ObiTalk provisioning recently to check for the firmware update, the portal provisioning must have turned the ObiTalk Service back on. I didn't think to look for it, so thanks for the reminder. Once I disabled it by unchecking the box, I rebooted and the device then showed off-line.
I haven't yet added the "!**5S0|" string to the DigitMap as it didn't seem like it was needed. What does that string do?