�1���� General
�2����
Rules for alternative routing
�3����
Rules for conversion of TCICs and NICs
�4����
A third COT on type D to allow conversion of NIC to TCIC, and overcome
possible call connected signal and answerback timing problems
�5����
Rules for service signal conversion
�6����
Rules for exchange of line identifications
�7����
Rules for call connected signal conversion
�8����
Rules for obtaining the called subscriber�s answerback when interworking
type D with other signalling systems