An unique value, greater than zero, for each
DNIS phone number. The value ranges from 1 to
'dnisMgmtGlobalNumEntries' and identifies which
DNIS phone number is associated with.
It is recommended that the value are assigned
continuously starting from 1. The value must remain
constant at least from one re-intialization
of the entity's network management system to the next
re-intialization.
Note:
This attribute is no longer used as an index
in this table. It always returns 1.