[asterisk-dev] call_festival_dialplan

[DOCAS DUDU ZULU]

i am integrating festival with asterisk,i want to know how can i invoke
festival from the dial plans,i when a user is called then festival is
invoked to read the message,this is my dialplan

 exten => 4540,1,Dial(SIP/sihle)

 exten => 4540,1,ReadFile(test=/tmp/test.txt,130)
 exten => 4540,n,Festival(${test})
 exten => 4540,n,Hangup

what i want is when exension 4540 is called then the message from
festival is read to that user,so how can i combine the two,its possible
when i dial 4540 to get the message but that is like pulling the message
but what i want is to send the message when the user is called, i want
the message from festival to be sent to the user "sihle" when that
extensions is dialed.

thanks
docas