• CCITT Rec. Q.115 (11/1988) – CONTROL OF ECHO SUPPRESSORS AND ECHO CANCELLERS BY INTERNATIONAL SWITCHING CENTRES
    • 3.1 General
    • 3.2 Terminology
    • 3.3 Compatibility of echo control devices and signalling equipment
    • 3.4 Operation without signals
    • 3.5 Analysis of information at an outgoing international exchange
    • 3.6 Decision to be taken at the outgoing international exchange
    • 3.7 Decision to be taken at an international transit exchange
    • 3.8 Decision to be taken at the incoming international exchange
    • 3.9 Other considerations
  • ANNEX A – Call processing logic - Echo suppressor control
  • ANNEX B – Echo suppressor control on inter-ISC circuits within a single country
  • References