The status of a call on Plivo is sent to the request URLs under the CallStatus key. Decisions can be made by your app to process a call based on this status.
Plivo will send one of the following values under the CallStatus parameter.
The call has been answered and is currently in progress. Calls under this status can be explicitly terminated using the Hangup API.
The call has been completed. It’s either terminated using the Hangup API or ended by one of the parties in the call.
The call is currently ringing. This status is sent to the Ring URL.
The call hasn't been answered by the callee. Your application must have the logic to parse this parameter and take actions based on this.
The callee is busy on a different call. You should retry after sometime.
The call has been cancelled by the callee without answering.