Here is the dial plan
[testInComingCalls]
exten => s,1,Answer
exten => 30953025,1,Dial(SIP/20000,20)
I would like to play an audio file as soon as somebody answered the call..
Please give me some idea how to call a php file, send the input and based on the output forward the call.
Since most of the Dial options act on the called party, not the caller, you have to get a little creative. It is a little odd to do such things to the caller as opposed to the called party, but hey, it's Asterisk: there's usually a way to do whatever you want.
One approach would be to use the lesser known (and somewhat strange) G option. Quoting from the documentation:
If the call is answered, transfer the calling party to the specified priority and the called party to the specified priority plus one.
- context
- exten
- priority
Basically, the G option takes the caller/called channel and - instead of bridging them together - bounces both of them out to the dialplan. You can then get a little creative to perform your Playback operation before putting them in a Bridge together. The following Dialplan should work (caveat: I haven't tested this and I'm sitting on a laptop on a couch, but this should get you close):
[default]
exten => 1000,1,NoOp()
same => n,Dial(SIP/alice,,G(default^bridge_and_play^1))
same => n,Hangup()
exten => bridge_and_play,1,Goto(jump_caller,1)
same => n,Goto(jump_called,1)
same => n,Hangup()
exten => jump_caller,1,NoOp()
same => n,Answer()
same => n,Playback(tt-monkeys)
same => n,Bridge(${bridge_this})
same => n,Hangup()
exten => jump_called,1,NoOp()
same => n,Set(MASTER_CHANNEL(bridge_this)=${CHANNEL})
same => n,Wait(1000)
same => n,Hangup()
Who do you want to play the audio to, the caller or the callee?
You can use the M flag to Dial to run a macro on the call right before it's bridged, it runs on the callee SIP/200000. Example:
[testInComingCalls]
exten => 30953025,1,Dial(SIP/20000,20,M(onanswer))
[macro-onanswer]
exten => s,1,Playback(hello-world)
You need read info about AGI interface, which allow use php via phpagi to control dialplan.
http://www.voip-info.org/wiki/view/Asterisk+AGI
For playback file use STREAM FILE agi command($agi->stream_file in php)
