I tried 

GET /channels/{channelid}/variable?variable=CHANNEL(pjsip,call-id)


But it responds with

"message": "Channel not in Stasis application"


Since I want to get the call-id for a channel not in stasis I guess that won’t 
work.  Similarly, I can’t force the channel through my own code in the 
dialplan, so the PJSIP_HEADER function won’t work.  So it looks like I’ll have 
to upgrade my Asterisk test system to get the Call-ID from the ARI event.  It 
looks like it was added in Ast 16.


Out of curiosity, I see that call-id is returned in the “protocol_id” field of 
channel data structure.  However, since all channels in the same call must have 
the same Call-ID, how can this data be associated with a channel?  Wouldn’t it 
have to be associated with a bridge?  The Call-ID should not be available until 
two legs are bridged (I think).





From: asterisk-users [mailto:asterisk-users-boun...@lists.digium.com] On Behalf 
Of Joshua C. Colp
Sent: Saturday, June 17, 2023 2:25 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion 
Subject: Re: [asterisk-users] Get SIP Call-ID from ARI


On Sat, Jun 17, 2023 at 2:55 PM TTT <li...@telium.io <mailto:li...@telium.io> > 

Based on postings it should be possible to get the SIP Call-ID header value 
from the ARI.  At what point is this value available ?  As well, how do I 
retrieve that value – something like


GET /channels/{channelId}/pjsip_header?key=Call-Id


But that doesn’t work.


'pjsip_header' is not a valid route. All possible routes are documented on the 
wiki, if it's not there then it doesn't exist.


Instead you would use variable[1] to execute the PJSIP_HEADER dialplan 
function[2] or a better way would be the CHANNEL dialplan function[3] such as:


GET /channels/{channelid}/variable?variable=CHANNEL(pjsip,call-id)


Though I haven't tested that.


Newer versions also include the protocol identifier (Call-ID) in the channel 
ARI structure[4] which would be in events, or explicitly retrieved[5].



[2] https://wiki.asterisk.org/wiki/display/AST/Asterisk+20+Function_PJSIP_HEADER

[3] https://wiki.asterisk.org/wiki/display/AST/Asterisk+20+Function_CHANNEL





Joshua C. Colp

Asterisk Project Lead

Sangoma Technologies

Check us out at www.sangoma.com <http://www.sangoma.com>  and www.asterisk.org 

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