[asterisk-users] question on pri intense debug

[Jerry Geis]

Running asterisk 1.4.26.2

 help pri
           pri debug span  Enables PRI debugging on a span
   pri intense debug span  Enables REALLY INTENSE PRI debugging
        pri no debug span  Disables PRI debugging on a span
       pri set debug file  Sends PRI debug output to the specified file
           pri show debug  Displays current PRI debug settings
           pri show spans  Displays PRI Information
            pri show span  Displays PRI Information
         pri show version  Displays version of libpri
     pri unset debug file  Ends PRI debug output to file


then I type the following command:
pri intense debug 1
No such command 'pri intense debug 1' (type 'help pri intense' for other 
possible commands)

Why is it not understanding my command?

Jerry