3.1.6.5 Path Test Retry Timer
When the Path Test Retry Timer elapses, the new client MUST send a new SESS_PATH_TEST message to the source address and port of the existing client for which it is expecting a connection. This message MUST be sent from the same UDP port number on which it is expecting the connection. If fewer than the maximum number of attempts have been made, the timer MUST then be rescheduled so that it MAY elapse again. Otherwise, the retries have been exhausted and the Path Test operation SHOULD be canceled.