[answerwait]
    exten => answerwait,1,Answer()
    exten => answerwait,1,Wait()

[read_text]
    exten => s,1,Answer( )
    exten => s,2,Dial(SIP/113)
    exten => s,100,System(echo '${text}' | /usr/bin/espeak  --stdout |sox -t  wav - -r 8000  /tmp/voice.wav)
    exten => s,n,Playback(/tmp/voice)
    exten => s,n,System(rm /tmp/voice.wav)
    exten => s,n,Hangup( )
----------------------
call file:
Channel: Local/answerwait@answerwait
Context: read_text
CallerID: alerts
Extension: s
Priority: 1
Set: text="Test"