[Freeswitch-users] Problem accessing channel variables

[Steven Ayre]

>
> ... how I listen for these events. Is it just a case of polling the
> socket for them at frequent enough intervals?


You subscribe to the events you're interested in with 'events'
http://wiki.freeswitch.org/wiki/Event_socket#event

There's no polling involved. FS will send all subscribed events through the
socket, you just need to receive them. Use select()/poll()/equivalent to
detect when data has arrived.

Since you already have xml_cdr working that would be the best place to
collect it, if you can add an extra DB insert in the handler.

-Steve


On 29 November 2012 11:58, Richard Gration <richgration at gmail.com> wrote:

> Hi,
>
> Thanks for your reply. I was wondering ...
>
> > If you listen to events then you should be able to reliably receive a
> hangup
> > event containing the variables if you are still connected at that time.
>
> ... how I listen for these events. Is it just a case of polling the
> socket for them at frequent enough intervals?
>
> > If you want a 100% reliable method use CDRs.
> >
> > mod_xml_cdr can submit call CDRs to a webserver just after call hangup.
> The
> > XML is verbose and will contain a full call history and all channel
> > variables. Because it's submitted ASAP you get the results in real time
> and
> > reliable. If the module can't submit the CDRs it writes them to an error
> > folder on disk where you can resubmit them.
> >
> > Real time seems useful for your use-case, as your script would just need
> to
> > check your DB whether the CDR had been submitted yet. The channel UUID
> can
> > either be captured from events or specified in advance in the originate
> > (originate_uuid). There's a uuid api call to generate them for you. I'd
> > suggest looking at this method.
>
> This is all great info, thanks :-) I'm capturing the uuid from the
> response from the originate command, that's no problem.
>
> The box I'm doing this on is being a B2BUA for us at the moment. The
> CDRs are already being HTTP POSTed to a URL, I can't change that as
> our billing depends on it. I can see the channel variable coming
> though in the POST content, so maybe I can frob the CDR script to give
> me what I want.
>
> Thanks again for the info.
>
> Cheers,
> Rich
>
> --
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>
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