18.104.22.168 Receiving a Teardown Request
The server MUST first follow the steps as specified in section 22.214.171.124.
The Teardown request MUST follow the rules as specified in section 126.96.36.199.
The Teardown response MUST follow the rules as specified in sections 188.8.131.52 and 184.108.40.206.
After sending the response, the server MUST close the TCP connection to the client and delete the session state.