ITU-T E.500 Traffic Intensity Measurement Principles - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors Quality of Service Network Management and Traffic Engineering - Traffic Engineering - Measurement and Recording of Traffic*, 1998-04-19 Update
ITU-T E.501 Estimation of Traffic Offered in the Network - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors Quality of Service Network Management and Traffic Engineering - Traffic Engineering - Measurement and Recording of Tra*, 1997-05-01 Update