Rec. ITU-T Q.118 (03/1993) … ABNORMAL CONDITIONS - SPECIAL RELEASE ARRANGEMENTS
FOREWORD
CONTENTS
1 Answer signal not received by an outgoing exchange after receiving a number-received signal or ...
2 Delay in clearing by the calling subscriber in automatic service (arrangements made in the outgoing country)
3 Clear-forward signal not received by the incoming exchange after sending a clear-back signal