SRS Output and SRS Output Status Message Tags
Note: Many values, names and usages are configurable and vary between implementations. The details and description of configuration options are outside the scope of this document.
Note: For performance reasons the type 20(TRBL_ERT_UPDATE) message contains limited information. The available fields are: <srsOutputMsgType>, <eventIdx>, <estRestTime> and <estSource>. Other fields are either NULL or 0.