Initiate call from extension - asterisk

Question

It is possible to initiate call from extension? My extension is look like the following:
[read_text]
exten => s,1,Answer( )
exten => s,n,Dial(SIP/1,G(99))
exten => s,n,Dial(SIP/2,G(99))
exten => s,n,Goto(1)
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( )
So if SIP/1 or SIP/2 answers, It plays text and hangup, if nobody answer it continues to Dial
I tried to make call file, but it requires some channel to be setup, I tried to use Local, but unsuccess.
I also found that there are queues, but can't find a way to initiate call to queue from call file. I'm very new to asterisk.

Answer 1

What your trying to do can get pretty messy from the dialplan. Try something along these lines:
[call_read_text]
exten => s,1,Dial(SIP/1,gG(read_text,s,1))
exten => s,n,Dial(SIP/2,gG(read_text,s,1))
exten => s,n,Goto(1)
[read_text]
exten => s,1,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()
Dont answer the call before you start!
g will continue in the dialplan if the call isn't answered, and call the next extension
G() will jump to read_text,s,1 if the call IS answered, and end the hunt
You can jumpstart all this with a call file, by connecting the first context with the second (will happen on answer).
Something along these lines:
Channel: Local/s#call_read_text
Context: read_text
Extension: s
Priority: 1
More on call files here: http://www.voip-info.org/wiki/view/Asterisk+auto-dial+out. Use Set: foo=bar in the call file to set ${text}