�1���� Introduction
�2����
Scope
�3����
Related Recommendations
�4����
General principles of interconnection
�5����
Network interconnection scenarios
�6����
Echo control
������� 6.1���� General
� ������6.2���� Location of
echo control devices
������� 6.3���� Network control
������� 6.4���� Implementation considerations
�7����
Roaming
�8����
Handover
�9����
History
Annex A � Alphabetical list of abbreviations used in this Recommendation