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@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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