Asterisk Subroutine Call : Pre-Dial Handlers
Pre-dial handlers allow you to execute a dialplan subroutine on a channel before a call is placed but after the application performing a dial action is invoked. This means that the handlers are executed after the creation of the caller/callee channels, but before any actions have been taken to actually dial the callee channels. You can execute a dialplan subroutine on the caller channel and on each callee channel dialled.
There are two ways in which a pre-dial handler can be invoked:
- The ‘B‘ option in an application executes a dialplan subroutine on the caller channel before any callee channels are created.
- The ‘b‘ option in an application executes a dialplan subroutine on each callee channel after it is created but before the call is placed to the end-device.
Uses of pre Dial handler:
[default]
exten => s,1,NoOp()same => n,Dial(SIP/bar,,B(default^caller_handler^1))same => n,Hangup()exten => caller_handler,1,NoOp()same => n,Verbose(0, In caller pre-dial handler!)same => n,Return()
[default]
exten => pre_dial_handler,1,NoOp()
same => n,Verbose(1, Channel is ${CHANNEL})
same => n,Return()
exten => dial_example,1,NoOp()
same => n,Dial(SIP/alice,,b(default^pre_dial_handler^1)
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