This Recommendation specifies the elements of DCME using 16 kbit/s LD-CELP, Digital Speech Interpolation (DSI) and Facsimile Demodulation/Remodulation in order to achieve interworking of such equipment. It specifies extensions and deviations for Recommendations G.763 and G.766 which specify a 32 kbit/s ADPCM DCME, and Facsimile Demodulation/Remodulation.