http://www.freepbx.org/book/export/html/2030
Change to the Asterisk CLI
To change to the Asterisk command line interface (CLI), at the root prompt type:
root@pbx~$ asterisk -rvv (r and two v’s)
The prompt should change to
CLI>
Asterisk will display all activity that occurs on the command line. You will see information about the extensions each time they connect. It will show the dialplan commands as they are being executed – another great troubleshooting tool! You can type help at the Asterisk CLI to view the CLI commands available.
To return to the Linux prompt, type
CLI> exit
How to Make a T1 Crossover Cable
http://www.ldfacts.com/faq_files/How-to-Make-a-T1-Crossover-cable.htm