This Recommendation provides guidance on the effect of talker echo, and some general rules for the insertion of network echo cancellers. (Talker echo is considered independently of all other impairments.)
ITU-T G.131 SPANISH-2003 Referenced Document
ITU-T G.107-2003 The E-Model@ a computational model for use in transmission planning Series G: Transmission Systems and Media@ Digital Systems and Networks International telephone connections and circuits - General definitions (Study Group 12)
ITU-T G.108-1999 Application of the E-Model: A Planning Guide Series G: Transmission Systems and Media Digital Systems and Networks International Telephone Connections and Circuits - General Definitions Study Group 12; 141 pp; Covering Note December 7 2000
ITU-T G.108.2-2003 Transmission planning aspects of echo cancellers SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits ?General definitions Study Group 12
ITU-T G.109-1999 Definition of Categories of Speech Transmission Quality - Series G: Transmission Systems and Media Digital Systems and Networks International Telephone Connections and Circuits - General Definitions Study Group 12; 11 pp
ITU-T G.168-2002 Digital Network Echo Cancellers (Study Group 15)
ITU-T P.310-2003 Transmission characteristics for telephone band (300-3400 Hz) digital telephones SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Subscribers' lines and sets Study Group 12
ITU-T Q.115.1-2002 Logic for the control of echo control devices and functions SERIES Q: SWITCHING AND SIGNALLING Clauses applicable to ITU-T standard systems Logic and protocols for the control of signal processing network elements and functions Study Group 11