cgashlin01,
To switch to SIP mode, power up the endpoint with the buttons 1 and 2 pressed on the dialpad. To switch back to ITP mode, hold down 5 and 6 on the dialpad while powering up. After that you can change the settings in the Web Interface and upload new firmware via a TFTP server.
If I remember correctly you need to put :8080 at the end of the IP Address that the 8622 got from your DHCP server in order to get into the web interface. The default username [IPT], which can't be changed, and password [iptpassw], which hopefully was not changed at any point.
Thanks,
TE