The phone number that will be called first. Preferably in E.164 format. If not set, our system will try to match it with a country and make a call. If landline number, prefix it with STD code; Ex: 0XXXXXX2400

This is your ExoPhone (pick one from here)

http://my.exotel.com/{your_sid}/exoml/start_voice/{app_id} where app_id is the identifier of the flow (or applet) that you want to connect to once the From number picks up the call. You can get the app_id from your Exotel Dashboard

trans – for Transactional Calls

The time limit (in seconds) that you want this call to last. The call will be cut after this time

The time (in seconds) to ring the called parties (both first and second call leg)

When the call completes, an HTTP POST will be made to the provided URL with the following four parameters:

CallSid – an alpha-numeric unique identifier
Status – one of: completed, failed, busy, no-answer
RecordingUrl – link to the call recording (if it exists)
DateUpdated – time when the call state was updated last

Any application specific value that will be passed back as a parameter while doing a GET request to the URL mentioned in your Passthru Applet or Greetings Applet.