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.

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)

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Using low bandwidth CODECs helps reduce bandwidth requirements however due to the overhead of IP, UDP and RTP protocols, such reduction is limited.

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