Idle: initial state of the call
Inviting: state after sending INVITE
Redirected: received a 3XX response on the INVITE
Unauthenticated: received a 401 or 407 response on the INVITE
Incoming Call: Received an initial INVITE
Incoming Call Accepted: state after accepting an initial INVITE
Connected: Call is established
Disconnected: state after receiving a BYE request from the remote part
Disconnecting: state after sending a BYE request on the connected call
Terminated: call is Terminated, final state
Canceled: state after receiving a CANCEL request a Incoming Call
Canceling: send Cancel request on Proceeding state
Proceeding: the call assumes the PROCEEDING state when it receives a provisional response in the INVITING state
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