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G.726
Last modified: Wednesday, May 07, 2008 


An International Telecommunications Union (ITU-T) standard for for audio (speech) compression and decompression that is used in digital transmission systems, and in particular, used for the coding of analog signals into digital signals.

G.726 is an ITU-T Adaptive Differential Pulse Code Modulation (ADPCM) standard speech codec used for the  transmission of voice at rates on 16, 24, 32, and 40 kbit/s channels. G.726 supersedes both G.721 and G. 723 as it includes both of these standards plus includes the new standard for the 16 kbit/s rate. G.726 was the standard codec used in Digital Enhanced Cordless Telecommunications (DECT) wireless phone systems.

See G.7xx for more information on how these standards are used in telephony networks.
See also ADPCM.

  Related Links

Enterprise VoIP Planet
The IT Manager's Guide to Voice over IP

ITU Recommendation G.726
40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)

Six Steps to Getting Your Network Ready for Voice over IP
Using low bandwidth CODECs helps reduce bandwidth requirements however due to the overhead of IP, UDP and RTP protocols, such reduction is limited.

The International Telecommunication Union
The International Telecommunication Union is an international organization within which governments and the private sector coordinate global telecom networks and services. This home page offers numerous links to highlights and current topics, standardization, radiocommunication, telecommunication, and general secretariat sectors.

Webopedia's Quick Reference Section
Use this Webopedia reference section for information on common Internet and computer facts and occurrences.


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