[asterisk-dev] Add SIP Header with PJSIP in C module

[Richard Mudgett]

With chan_sip you had to add those headers on the incoming channel.  With
PJSIP you cannot add them to the incoming channel
as you showed.  You MUST add those headers to the outgoing channel for the
outgoing channel to use the headers.

same = n,NoOp(This is the incoming channel which could be
PJSIP/200-xxxxxxxx)
same = n,Dial(PJSIP/101,10,b(my_predial))
same = n,Hangup()
; This pre-dial handler executes on the outgoing channel which would be
PJSIP/101-xxxxxxxx
same = n(my_predial),Set(PJSIP_HEADER(add,X-MyHeader)=valuetest)
same = n,Return()

Richard

https://wiki.asterisk.org/wiki/display/AST/Asterisk+18+Application_Dial

On Wed, Oct 21, 2020 at 12:28 PM Benoit Duverger <bduverger at atwtech.com>
wrote:

> Thanks for your quick answer.
>
> I'm not sure to understand how Pre-Dial Handlers can help my module
> written in C. But if I decide to rewrite this module in asterisk language,
> that could help me. For the moment I hope to fix my C module.
>
> A big resume of what this part of my module do is:
> pbx_exec(chan, "SipAddHeader(X-MyHeader:valuetest)");
> pbx_exec(chan, "Dial(SIP/101 at trunk-test,10)");
> That works in asterisk 1.8, 11 and probably in asterisk 16 if I use
> chan_sip but SipAddHeader is no longer a valid application in my asterisk
> because I don't load chan_sip.so, just all modules related to PJSIP.
>
> So with PJSIP, I try:
> pbx_builtin_setvar_helper(chan, "PJSIP_HEADER(add,X-MyHeader)",
> "valuetest");
> pbx_exec(chan, "Dial(PJSIP/101 at trunk-test,10)");
>
> I didn't have any errors but my header is not added.
>
> Thanks
>
>
> Le mer. 21 oct. 2020 à 12:23, Richard Mudgett <rmudgett at digium.com> a
> écrit :
>
>> You add headers in a similar way as before.  It is just a matter of
>> adding them to the right channel.
>> You must add them to the outgoing channel for PJSIP.  This can be
>> accomplished by using pre-dial handlers [1][2].
>>
>> Richard
>>
>> [1] https://wiki.asterisk.org/wiki/display/AST/Pre-Dial+Handlers
>> [2]
>> https://www.asterisk.org/dialplan-handler-routines-allow-customization/
>>
>> On Wed, Oct 21, 2020 at 10:49 AM Benoit Duverger <bduverger at atwtech.com>
>> wrote:
>>
>>> Hello,
>>>
>>> We have a module written in C which was developed initially for asterisk
>>> 1.4, modified a few years ago to run in asterisk 1.8 then 11. This module
>>> is used to verify user's limits, route calls etc...
>>> Actually, I try to adapt it to run in asterisk 16, I moved from chan_sip
>>> to PJSIP and I don't know how can I add SIP Headers into the channel. With
>>> chan_sip we used that:
>>> sprintf( cmd, "SipAddHeader(command:%s)", command );
>>> res = astcmd( chan, cmd );
>>> astcmd is a custom function wrapped onto pbx_exec().
>>>
>>> I tried to use pbx_builtin_setvar_helper(), with the function
>>> PJSIP_HEADER() but I didn't see any custom headers in SIP... and no errors,
>>> res = 0.
>>> res = pbx_builtin_setvar_helper(chan, "PJSIP_HEADER(add, X-test)",
>>> "test");
>>>
>>>
>>> How can I use PJSIP_HEADER in a C module ?, which libraries should I
>>> need to import ?
>>>
>>> Thanks
>>>
>>> --
>>>
>>> Benoit
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>>
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>
>
>
> --
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