- "Pulse Code Modulation of Voice Frequencies," ITU-T Rec. G.711, ITU Geneva, Nov. 1988.
- G.. Malkin, "Routing Information Protocol," RIP Version 2, RFC 2543.
- "Packet-based Multimedia Communication System," ITU-T Rec. H.323, ITU Geneva, Nov. 2000.
- "Speech Coders, Dual Rate for Speech, 5.3 and 6.3 kbps," ITU-G.723.1, Multipulse Maximum Likelihood Quantization (MPMLQ), ITU Geneva," 1996.
- "Speech Coders, Algebraic Code-Excited Linear Prediction Coder," ITU-G.723.1, ITU Geneva, Mar 1996.
- "40, 32, 24 and 16 kbps Adaptive Differential Pulse Code Modulation," ITU-T G.726, ITU Geneva, Dec. 1990.
- "Coding of Speech at 16 kbps Low-Delay Code-Excited Linear Prediction (LD-CELP)," ITU-T G.728, ITU Geneva, Sept. 1992.
- "Reduced Complexity 8 kbps CS-ACELP Speech Coder," ITU-T Rec. G.729A, ITU Geneva, March 1996.
- "Megaco Protocol," Version 1.0, RFC 3015, IETF Nov. 2000, www.RFCeditor.org
- "One-way Transmission Time," ITU-T Rec. G.114, ITU Geneva, May 2000.
- Nortel Paper on VoIP Performance, Nortel, Ottawa, Ontario, Canada, Nov. 2000.
- "Digital Network Echo Cancellers," ITU-T Rec. G.168, ITU Geneva, June 2002.
- "Gateway Control Protocol," ITU-T Rec. H.248, ITU Geneva, July 2000.
- "Terminal for Low Bit-Rate Multimedia Communications," ITU-T Rec. H.324, ITU Geneva, March 2002.
- "Narrowband Audio/Visual Communication Systems and Terminal," ITU-T Rec. H.320, ITU Geneva, May 1999.
- "Call Signaling Protocols and Media Stream Packetization for Packet-Based Communication Systems," ITU-T Rec. H.225, ITU Geneva, July 2001.
- "Control Protocol for Multimedia Communication," ITU-T Rec. H.245, ITU Geneva, July 2001.
- "The International Public Telecommunication Numbering Plan," ITU-T Rec. E.164, ITU Geneva, May 1997.
- IEC Reports on-line. www.iec.org/online/tutorials, VoIP, Jan 2003.
- "Media Gateway Control Protocol (MGCP)," Version 1.0, RFC 3445, Jan 2003.
- "Data Protocols for Multimedia Conferencing," ITU-T Rec. T.120, ITU Geneva, June 1996.
- "Internet Protocol," RFC 791, DDDN Network Information Center, SRI International, Menlo Park, CA, Sept. 1981.
- Roger L. Freeman, "Telecommunication System Engineering," 4th ed., John Wiley & Sons, Hoboken, NJ June 2004.
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This was first published in June 2006