NEC univerge SV9100 Programming Manual page 417

Issue 4.0
Conditions
When the trunk type is set to 3 (DID) in 22-02-01, the DID Transfer Destination for each DID feature is not
supported. This feature is supported only for DID trunks when assigned as VRS.
Feature Cross Reference

Direct Inward Dialing (DID)
SV9100 Programming Manual 2-377