Description: A value that distinguishes this entry from another entry. Entries in this table are referenced from other objects which identify call parameters.

It is impossible to know which other objects in the MIB reference entries in the table by looking at this table. Because of this, changes to parameters must be accomplished by creating a new entry in this table and then changing the referencing table to identify the new entry.

Note that an agent will only use the values in this table when another table is changed to reference those values. The number of other tables that reference an index object in this table can be found in x25CallParmRefCount. The value of the reference count will affect the writability of the objects as explained above.

Entries in this table which have a reference count of zero maybe deleted at the convence of the agent. Care should be taken by the agent to give the NMS sufficient time to create a reference to newly created entries.

Should a Management Station not find a free index with which to create a new entry, it may feel free to delete entries with a reference count of zero. However in doing so the Management Station much realize it may impact other Management Stations.