The new ITU-T Rec. G.711.0 is a lossless and stateless compression for ITU-T Rec. G.711 packet payloads typically used in VoIP. This new recommendation was "consented" on July 10, 2009. I brought the concept behind G.711.0 to the ITU-T in 2007 (see picture below) via a prototype that did functionally the same tthing (lossless, stateless compression of G.711) - except at less effective compression.
The new G.711.0 "codec" has been characterized to provide more than 50% average compression in typical service provider environments and over 65% in typical enterprise environments. It has been designed to have low complexity (1.0 WMOPS average, 1.7 WMOPS worse-case) and low memory footprint ( < 5k octets RAM, < 5k octets ROM, < 3.6k basic operations) while effectively compressing the dominant use-case of G.711 encoding of zero-mean acoustic signals (e.g., speech and audio). The lossless design allows for G.711.0-based compression and decompression to be applied multiple times on an end-to-end connection (multiple self-transcodes) with no degradation of voice/audio quality.
G.711.0 may be used as a traditional codec with its use negotiated end-to-end. However, its lossless and stateless design also allows its use as a compression mechanism on any link (or combination of links) where G.711 has been negotiated end-to-end. In this case, explicit use of G.711.0 on any intermediate link need not be signaled to or negotiated by the end systems.
G.711.0 accommodates both G.711 coding laws (µ-law and A-law) and frame sizes typically used in VoIP (40, 80, 160, 240 and 320 samples). It is lossless for all possible G.711 packet payloads.
The G.711.0 standard is the first G-series codec contribution from Cisco. Recommendation G.711.0 is also referenced as " G.711 - Annex 1".
The ITU-T Rec. G.711.0 standard is below, as is G.711 - Ammendment 1 and 2010 ICASSP paper on G.711.0.
Pictures from the G.711.0 development process are below: (Top Left) Ramalho demonstration of our "pre-standard" G.711-LLC phones at the ITU-T in Geneva in 2007, (Top Right) pre-standard G.711-LLC implemented on our IOS gateways (with Wei Wang and Jim Frauenthal), (Bottom Left) collaborators from Texas Instruments, NTT, Cisco and Huawei as well as ITT-T SG 16 dignitaries, and (Bottom Right) the G.711.0 consent gavel at the ITU-T on July 10, 2009.