�1���� Ineffective outgoing call
������� 1.1���� Non-return of the call-confirmation and/or proceed-to-select
signal(s)
������� 1.2���� Slow or incomplete selection
������� 1.3���� No response after selection
������� 1.4���� Ineffective attempts followed by service signals
������� 1.5���� Ineffective calls characterized by a clearing signal without a
preceding service signal
������� 1.6���� Reception of an answerback
������� 1.7���� Possible terminal configuration
�2����
Ineffective incoming calls
������� 2.1���� False calls
�3����
Incidents following call set-up
������� 3.1���� Idle circuit without clearing signal
������� 3.2���� No clear-confirmation