2010IEEE Std 269-2010 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets - Redline
2003IEEE Std 269-2002 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
1993IEEE Std 269-1992 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets
1983IEEE Std 269-1983 IEEE Standard Method for Measuring Transmission Performance of Telephone Sets
1971IEEE Std 269-1971 IEEE Standard Method for Measuring Transmission Performance of Telephone Sets
1966IEEE 269-1966 Methods for Measuring Transmission Performance of Telephone Sets