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

[Neil Patel]

I played around with a couple options and found that issuing a hupall
normal_clearing on the initiated call after a few seconds was the most
reliable way to do this. The next best option I found was hanging up after a
few seconds of receiving CS_EXECUTE state update, though this seemed to
cause the timing to vary.

Are there other events that come over ESL on a PRI call that are good to
anchor to? For some of the suggestions above like "progressing", it isn't
clear what event that corresponds to.

On Thu, May 13, 2010 at 5:14 PM, Neil Patel <neilp at cs.stanford.edu> wrote:

> Thanks Michael, I was looking for code examples to receive events over ESL,
> and found them in libs/esl/.
>
> I'm still not clear on the following:
>
>    1. I have a controller script that originates calls; it runs "show
>    channels" between calls and parses out the number of active channels. If
>    below threshold, originate next call. If not, wait a couple seconds and run
>    "show channels" again, repeating till below threshold. Is this the best way?
>    Can this be done more efficiently through events? How?
>    2. For placing missed calls to SIP endpoints, it sounds like* *I can
>    wait for a signal 180 or 183 to know when to hang up. How do I check for
>    those signals? Is this another job for events?
>    3. For placing missed calls over openzap/PRI, it sounds like I can
>    check for call states PROGRESS or ALERTING? Where are those states from, and
>    how do I check them? Again, can I use events? The other option you gave is
>    checking for endpoint_disposition. This is in the cdr, but how do I use it
>    for detecting when I should hang up for a missed call? Is there an event
>    associated with it? What are the call states it goes through?
>
> -Neil
>
> On Wed, May 12, 2010 at 2:47 PM, Michael Collins <msc at freeswitch.org>wrote:
>
>>
>> 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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