### 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
- Recommendation G.722, 7 kHz Audio-Coding within 64 kbit/s, 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