Why Asterisk 1.4.4 cli dose not support "sip show peers

I freshely installed asterisk 1.4.4 on Fedora Core 6, kernal 2.6.18. when I try sip show peers in cli, it give me out the command dose not supported.

Any fellow run into this problem before.

It works fine on my asterisk 1.4.4, but for some reason when you load asterisk 1.4.X or do a reload it takes a while for the sip module to start and at that time none of the sip cli commands seem to work sometimes even for a minute or longer