Not all activities or telephony providers support all events. For example, the Reject activity ends the call before the caller connects so the onNoAnswer function is never invoked from this activity.

The following table describes available event handlers and lists the Notify workflow activities that can invoke each handler.

Table 1. Event handlers

Handler	Description	Activities
onExecute	Runs when the activity first runs.	All call-related activities
onUpdate	Runs when the call record associated with the workflow is updated.	All call-related activities
onCompleted	Runs when a call ends.	All call-related activities
onRinging	Runs when a call starts ringing.	Forward call, call, join conference call, forward to notify client
onInProgress	Runs when both parties are connected on a call.	Forward call, call, join conference call, forward to notify client
onNoAnswer	Runs when a call is not answered.	Forward call, call, join conference call, forward to notify client
onBusy	Runs when a called number is busy.	Forward call, call, join conference call, forward to notify client
onFailed	Runs when an error occurs.	All call-related activities