[Freeswitch-users] how do I detect a call has rung once?

[Michael Collins]

On Wed, May 12, 2010 at 11:59 AM, Neil Patel <neilp at cs.stanford.edu> wrote:

> Thanks for the tips.
>
> Where are there examples of using ESL to register and handle events? For
> e.g. I don't see any example of how to register for a change in channel
> variable endpoint_disposition. Or even to check the CHANNEL_STATE event.
>
> -Neil
>
> Neil,

Check out the event socket documentation, specifically the "events plain
all" and "filter" commands. You can listen to all events or just specific
ones:
http://wiki.freeswitch.org/wiki/Event_socket

If you want to experiment with the event socket and the various events then
use fs_cli. Connect with fs_cli and then issue "/log 0" which turns off all
debug messages. Now you have basically a raw event socket. Try some of these
commands:

/event plain all

watch the fun messages fly. :)

You can filter them as well:

/filter Event-Name CHANNEL_STATE
/filter Event-Name CHANNEL_HANGUP

when you apply a filter you will receive only those things you choose. A
it's a "filter in" not filter out. Another way of saying it is "show me
events named CHANNEL_STATE" and "show me events named CHANNEL_HANGUP"

just note that in your script you will be using the ESL abstractions for
these:

http://wiki.freeswitch.org/wiki/Esl#ESLconnection_Object

I hope that helps! Have fun.
-MC
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