Call Connection Notification:

Field	Type	Description
type	string	The type of notification.
Payload Data
call_id	int	The ID of the call the notification is for.
phone_number	string	The phone number of the caller.
number_called	string	The Inbound Number which was dialled by the customer, this will only be present on inbound calls.
reference_id	string	The external reference ID.
call_direction	string	The direction of the call either inbound or outbound.
user_id	string	The ID of the user.
campaign_id	int	The ID of the campaign.
list_id	int	The ID of the list.
call_type	int	The ID for the type of call.