Amendment 1 to Recommendation ITU-T G.711 (1998) introduces Annex A, which recommends the use of Recommendation ITU-T G.711.0 (2009) for applications requiring the lossless encoding of frames consisting of 40, 80, 160, 240 and 320 A-/µ-law log-PCM samples conforming to Recommendation ITU-T G.711.
ITU-T G.711 AMD 1-2009 Referenced Document
ITU-T G.711.0-2009 Lossless compression of G.711 pulse code modulation Study Group 16*, 2009-09-01 Update
ITU-T G.711 AMD 1-2009 history
2009ITU-T G.711 AMD 1-2009 Pulse code modulation (PCM) of voice frequencies Amendment 1: New Annex A on lossless encoding of PCM frames Study Group 16