asterisk users - Jul 2023 - Get channel variables via ARI/AMI

I think that’s getting me close.  I’m trying to get (or recreate) the FROM and
TO lines of the header, from a system running PJSIP.  I think if I use CHANNEL
to get local_uri and local_tag I can recreate a FROM line like:

FROM=<URI>;tag=TAG

 

And if I use CHANNEL to get remote_uri and remote_tag I can recreate a FROM line
like:

TO=<URI>;tag=TAG

 

Would it be correct to assume that with this info (and ip:port info) I should be
able to send a UDP SIP message from the PBX to the UA which appears to be part
of the current call dialog?  I realize this is an odd thing to do, but I’m just
interested in technical feasibility at this point.  Before I try to code this I
want to ensure I’m not missing something stupid.

 

Thanks

Brian

 

 

From: asterisk-users [mailto:asterisk-users-bounces at lists.digium.com] On
Behalf Of Joshua C. Colp
Sent: Monday, June 26, 2023 3:08 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users
at lists.digium.com>
Subject: Re: [asterisk-users] Get channel variables via ARI/AMI

 

On Mon, Jun 26, 2023 at 4:04 PM TTT <lists at telium.io <mailto:lists at
telium.io> > wrote:

It looks like if I call Getvar and pass PJSIP_HEADERS() I can get the entire SIP
header for a channel.  I also read (on stackoverflow) that the PJSIP_HEADER
function will only return the headers from the INVITE of the inbound channel.

 

If that’s correct, how would I get the headers from the outbound channel (second
leg of the bridged call) INVITE ?  Or will PJSIP_HEADERS() in fact return the
header from either inbound out outbound legs?

 

The answer is, you can't. There are SOME protocol level things accessible
using CHANNEL[1] but that's it.

 

[1] 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 <http://www.asterisk.org>

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On Mon, Jun 26, 2023 at 4:35 PM TTT <lists at telium.io> wrote:
> I think that’s getting me close.  I’m trying to get (or recreate) the FROM
> and TO lines of the header, from a system running PJSIP.  I think if I use
> CHANNEL to get local_uri and local_tag I can recreate a FROM line like:
>
> *FROM=<URI>;tag=TAG*
>
>
>
> And if I use CHANNEL to get remote_uri and remote_tag I can recreate a
> FROM line like:
>
> *TO=<URI>;tag=TAG*
>
>
>
> Would it be correct to assume that with this info (and ip:port info) I
> should be able to send a UDP SIP message from the PBX to the UA which
> appears to be part of the current call dialog?  I realize this is an odd
> thing to do, but I’m just interested in technical feasibility at this
> point.  Before I try to code this I want to ensure I’m not missing
> something stupid.
>
Probably not. Sequence number also matters.

-- 
Joshua C. Colp
Asterisk Project Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
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>> There are SOME protocol level things accessible using CHANNEL[1] but
that's it.
>> [1]
https://wiki.asterisk.org/wiki/display/AST/Asterisk+20+Function_CHANNEL
 

 

I am trying to use the CHANNEL function listed above from the AMI.  Since it is
not an AMI “action”, but rather a dialplan “function”, I’m trying to figure out
how to call this from the AMI.  Using a telnet session to the AMI I’ve tried
variations of:

 

action: command

actionid: id123

command: channel(PJSIP/240000-1a)

 

but they don’t work.  Is the basic concept correct that I can using the
“command” action to run a statement that would work in the dialplan?  If not,
how would I call “channel” from the AMI ?

 

Thanks

Brian

 

 

 

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