This read-only integer counts the number of status enquiry messages received by the unit, meaning the far end is asking this unit about the state of a call. An administrator uses it to see how often the remote party is having to proactively check on this unit's call state, which can indicate the far end is missing expected status updates from this unit. For example, a rising statRxStatusEnquiryMessages count would prompt the administrator to check why this unit isn't sending expected status updates on its own.