[Asterisk-Users] Odd problem with asterisk

[info at ipfonia.com]

Hi!
I've been using asterisk for 1 year now, however since yesterday 
something odd happened. From my office i dial extension 125 and it 
wont work, it sounds as a busy tone, and in the x-lite gives 
me "call failed 404 not found, however if i dial from my house to 
that same extension then  it will connect me, can someone please 
help me?

Thanks