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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
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
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