17.26. ITRN - Internal traffic restriction group (ITR) network-wide 
Feature:
Intercept to attendant console (ATND), determine company name in calls to attendant
console
(ATND), block connections
Function:
The parameter only works with incoming messages but not with outgoing messages. When
this
parameter is set, the value of the Internal Traffic Restriction group (ITR) is not
taken
from the transferred protocol, but rather from the corresponding trunk for the further
processing of ITR-related features (SETUP -> in the case of the incoming seized trunk,
ALERT, CONNECT, DISCONNECT etc. -> in the case of the outgoing seized trunk).
Irrespective of whether the ITRN parameter is active or inactive, the ITR group of
the
trunk is used even if the protocol transfers no ITR group.
AMO Interrelationships:
ITRGR, TACSU, TDCSU
Device types:
Digital trunks
Protocol variants:
For example, CORNV33, ECMAV2, PSS1V2