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I'm trying to forward a specific incoming header to the other leg of the call, but can't figure out how to pass the value of the header in the incoming leg to the pre-dial handler

[addheaders] exten => addheader,1,Verbose("Setting header") exten => addheader,1,Verbose(${somevar}) ; The 'somevar' variable doesn't exist anymore exten => addheader,n,Set(PJSIP_HEADER(add,X-MyHeader)=test) exten => addheader,n,Set(PJSIP_HEADER(add,X-MyHeader2)=${somevar}) exten => addheader,n,Return() [incoming] exten => _+4600.,1,Ringing exten => _+4600.,n,Set(somevar=${PJSIP_HEADER(read,TheHeaderIWantToForward)}) exten => _+4600.,n,Verbose(${somevar}) ; Prints the correct value exten => _+4600.,n,Dial(PJSIP/${EXTEN:1},,b(addheaders^addheader^1)) exten => _+4600.,n,Hangup

I have successfully managed to add the X-MyHeader to the outbound call leg (as the asterisk documentation shows how to), but how do I actually pass the value to the other context? I can't read the variable in "[addheaders]", and I can only read the headers in "[incoming]"

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3 Answers 3

Reset to default
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You can use _VARIABLE: https://wiki.asterisk.org/wiki/display/AST/Variable+Inheritance

[handler] exten => addheader,1,NoOp(Value is ${somevar}) same => n,Set(PJSIP_HEADER(add,X-myheader=${somevar}) same => n,Return() [internal] exten => 6010,1,NoOp(Test) same => n,Set(_somevar=${PJSIP_HEADER(read,X-myheader)}) same => n,NoOp(Value is ${somevar}) same => n,Dial(PJSIP/6010,,b(handler^addheader^1)) same => n,Hangup()
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Don't know if this was the 'correct' way of doing this, but i solved it by accepting wildcard extensions in the addheaders context:

[addheaders] exten => _.,1,Set(PJSIP_HEADER(add,X-header-to-be-forwarded)=${EXTEN}) exten => _.,n,Return() [incoming] exten => _+4600.,1,Ringing exten => _+4600.,2,Set(customheader=${PJSIP_HEADER(read,X-header-to-be-forwarded)}) exten => _+4600.,3,GotoIf($["${customheader}"=""]?7:) ; Skip adding the header if it is empty exten => _+4600.,4,Dial(PJSIP/${EXTEN:1},,b(addheaders^${customheader}^1)) exten => _+4600.,5,GoTo(9)) exten => _+4600.,6,Dial(PJSIP/${EXTEN:1}) exten => _+4600.,7,Hangup

This has some limitations, for example "." or "," cant be used, but it solved our problem.

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You can also pass arguments to the Dial applications b option:

b([[context^]exten^]priority[(arg1[^...][^argN])]): Before initiating an outgoing call, Gosub to the specified location using the newly created channel. The Gosub will be executed for each destination channel.

Like this:

exten => _+4600.,n,Dial(PJSIP/${EXTEN:1},,b(addheaders^addheader^1(${somevar})))

Then use it:

exten => addheader,n,Set(PJSIP_HEADER(add,X-MyHeader)=${ARG1})
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