NEC SL1100 DID intercept

DID Intercept Destination for Each DID Number
With this feature the system allows you to program a DID Intercept destination for a DID number which receives no answer or busy call. The system can be programmed to use a trunk ring group, the VRS or the voice mail as the programmed destination. Each vacant number intercept for a DID number can have two destinations. The first destination is for an invalid DID number, busy or no answer extension. The second destination is for a no answer trunk ring group.
If the first programmed destination is a Ring Group and the second Destination is Voice Mail, the call does not forward to VoiceMail.
For busy or no answer intercept calls, a third destination can be defined in PRG 22-12. If the first and third destinations are programmed but the second destination is not, the incoming call goes to the third destination after the first destination. If the first and second destinations are not programmed, but the third destination is, the call goes directly to the third destination.
This feature works for DID trunks with a trunk service type 3 in PRG 22-02. Other types of trunks may use the DID table, but the DID intercept feature is not yet supported.