[Freeswitch-users] How to detect if the call is being transferred?

[Gonzalo Gasca Meza]

Hi Anis,

The way I do it is using ESL interface, I use it to initiate the call and
monitor events, in your case you can monitor events and extract variable
information, upon that take action.

For example:

events = "BACKGROUND_JOB " \
         "DETECTED_TONE " \
         "CHANNEL_OUTGOING " \
         "CHANNEL_CREATE " \
         "CHANNEL_ANSWER " \
         "CHANNEL_PROGRESS_MEDIA " \
         "RECORD_START " \
         "CHANNEL_HANGUP " \
         "CHAN_NOT_IMPLEMENTED "

self.connection.events("plain", events)

ev_name = reply.getHeader('Event-Name')

Filter in the event where you get your transfer information and filter
by call channel...

if self.call.uuid == reply.getHeader("Channel-Call-UUID"):

  variable_variable_transfer_time = reply.getHeader('*variable_transfer_time*')

  if variable_variable_transfer_time:

     writedb('transfer_time', variable_variable_transfer_time)

  Take action like write into DB, file, etc..

Hope it helps

You can ping me offline for more details.


-Gonzalo



On Sat, Oct 8, 2016 at 2:29 PM, Anis Bedhiafi <anis.bedhiafi at e-volut.io>
wrote:

> Hello
>
> I am working on application using Freeswitch and SIP.js in which I need to
> detect if the call is being transferred.
>
> The Sip.js application is actually an outbound dialer in which I load a
> list of phone numbers to call.
>
> The application starts by calling people.
>
> It is interesting to detect voicemail boxes. For that I am using mod_avmd.
>
> My problem is when the other end transfers the call, the sip.js client
> should know that the current call is being transferred.
>
> Is there a way that the original caller (sip.js client) knows that the
> call is being transferred?
>
> I was looking at all the channel variables and I found that the RDNIS
> variable and the transfer_time variable are filled up when there is a
> transfer.
>
> Is there a way to listen to the channel variables during the call and
> detect any change? Or is there a better way I can do it?
>
> Thank you for any suggestion.
>
> Anis Bedhiafi
>
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