Using text-to-speech in Asterisk
*packages required*
festival
festvox-rablp16k
file: extensions.conf
1 detail 2 exten => 3250,1,Answer() 3 exten => 3250,n,Festival('hello world') 4 exten => 3250,n,Hangup 5
From the command-line type 'festival --server'
Then restart Asterisk