This action should be used to hang up the incoming call.

The following is an example of the JSON response you would need to provide:

{
"clientActionId":"NumberMaskingId1",
"callflow":[
{
"action":"hangup"
}
]
}

Note: The Hangup action is needed only if you do not want to complete any other action. This action is not necessary if the calling user hangs up the call.