Call failed, 404 not found

I just installed Asterisk@Home and signed up with Sipdiscount. Followed instruction how to configured Sipdicount with Asterisk. When I tried to made call with X-lite, and Asterisk CLI does show my extension has been registed, but got following error. What could be the problem? Please help.

how the heck can we tell? you posted no configs and no log info!