[Asterisk-Users] invalid extension(need help)

[amna saleem]

hi!
I was wondering if the "i" extension works ,i mean i have included
this in my extensions.conf ie
exten => i,1,Answer 
exten => i,2,Playback(pbx-invalid) 
exten => i,3,Hangup

but it doesn`t seem to work,i am getting no announcement when i dial
an invalid no. rather i get the invalid tone (which we usually get on
our analog phones at home)
can someone help???
Thanx