[asterisk-users] PJSIP add header on forwarded call

[Joshua C. Colp]

On Tue, Nov 27, 2018, at 5:49 AM, Administrator TOOTAI wrote:
> Hi list,
> 
> to manage an external queue agent the only solution I found is to 
> connect a local account and redirect calls to this account using forward 
> features from the phone (SNOM). The problem I face is that before 
> calling the agent I would like to set extra header. Dialplan to call 
> external agent is this one with (Gosub):
> 
> [TOOTAiAudio]
> ;
> ; Call our gateway
> 
> exten = s,1,Set(PJSIP_HEADER(add,X-TOOTAiAudio-CALLED)=${ARG1})
>   same = n,Dial(PJSIP/${ARG1}@TOOTAiAudio,,T)
>   same = n,Return
> 
> exten = h,1,NoOp()
>   same = n,NoOp(Hangup Cause: ${HANGUPCAUSE})
>   same = n,NoOp(Dial status : ${DIALSTATUS})
>   same = n,NoOp(X-TOOTAiAudio=${PJSIP_HEADER(read,X-TOOTAiAudio-CALLED)})
>   same = n,Return
> 
> When a local phone call extension 115 (the one where calls to external 
> agent are forwarded), everything is working well. But if I call the 
> account from a queue I get
> 
> 
> [Nov 27 09:54:08] ERROR[12758][C-0000005f]: res_pjsip_header_funcs.c:513 
> func_write_header: This function requires a PJSIP channel
> 
> Output of queue is
> 
> deblix9*CLI> queue show q301
> q301 has 0 calls (max unlimited) in 'ringall' strategy (6s holdtime, 47s 
> talktime), W:0, C:25, A:3, SL:100.0%, SL2:100.0% within 60s
>     Members:
>        PJSIP/PPermis115 (ringinuse disabled) (dynamic) (Not in use) has 
> taken 8 calls (last was 706 secs ago)
>     No Callers
> 
> where PPermis115 is the local account on a phone who forward calls to 
> extension 115.
> 
> Why can't be PJSIP extra headers setted in this case ?

As documented on the wiki[1] the PJSIP_HEADER dialplan function has to be executed on the PJSIP channel itself, not the calling channel. You need to use a pre-dial handler and invoke it there.

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Function_PJSIP_HEADER

-- 
Joshua C. Colp
Digium - A Sangoma Company | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org