COR Operation

Two definitions are critical to understanding COR operation. In mathematics, a set is a list of numbers or labels. A subset is a set whose members are wholly contained in another set. Applying these concepts makes understanding COR operation simple. Calls succeed as long as the outgoing COR list is a subset of the incoming COR list. Table 12-1 shows the relationship between incoming and outgoing COR lists.

Table 12-1. COR Operation

Incoming COR List	Outgoing COR List	Result
None	None	Call succeeds
None	Applied	Call succeeds
Applied	None	Call succeeds
Applied	Subset of incoming COR list	Call succeeds
Applied	Not a subset of incoming COR list	Call fails

Note

If either the incoming dial peer or the outgoing dial peer does not have a COR list applied, the call succeeds.