These are a special form of a virtual node number to manage connections to systems or facilities (e.g. servers) which do not recognize node numbers. It is possible to enter the fictitious node number as the ONNO of the remote system(e.g. CO connections , VMS, Dictation equipment, PSE, Foreign system, analog Tie, digital Tie circuits to a foreign node). The number is assigned to a circuit with the AMO TACSU, TDCSU and TSCSU (activation by means of COT parameters) and an accompanying entry in the AMO KNDEF (under type = FOREIGN with the required codes )is also required.