ITU Documents

The following documents are available for a fee from the ITU Web site: http://www.itu.int.

• Recommendation G.711, Pulse Code Modulation (PCM) of Voice Frequencies,
  November 1988
• Recommendations G.726: 40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM), December 1990
• G.726 Appendix II, Digital test sequences for the verification of the G.726 40, 32, 24 and 16 kbit/s ADPCM, March 1991
• G.726 Appendix III, comparison of ADPCM algorithms, May 1994
• G.726 Annex A, Extensions of Recommendation G.726 for use with uniform-quantized input and output, November 1994
• G.726 Annex B, Packet format capability identifier and capability parameters for H.245 signaling, July 2003
• Recommendation G.729, Coding of speech at 8 kbit/s using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP), March 1996
• Annex A to Recommendation G.729: Reduced complexity 8 kbit/s CS-ACELP speech codec, November 1996
• Annex B to Recommendation G.729: A silence compression scheme for G.729 optimized for terminals conforming to Recommendation V.70, November 1996
• Recommendation H.225.0, Call signalling protocols and media stream packetization for packet-based multimedia communications systems, February 1998
• Recommendation H.245, Control protocol for multimedia communication, February 1998
• Recommendation H.323, Packet-based multimedia communications systems, February 1998