Ensure that:
an R2 Network Services Unit is programmed.
Interconnect Restriction and Intercept Handling are programmed for each trunk.
To program R2 trunks:
Digital Link Descriptors form
Enter "A" or "B" in the Address for Message Control field.
Enter "ISDN NODE" in the Integrated Digital Access field.
Digital Links form
Enter the Digital Link Descriptor Number programmed in step 1.
Class of Service Options form
Set the ANI/DNIS ISDN Number Delivery Trunk field to "Yes".
MSDN-DPNSS-DASS II Trunk Circuit Descriptors form
Select "R2" from the Card Type field.
Enable "Incoming" or "Outgoing" from the Dual Seizure Priority field.
Select "Local Office" from the Far End Connection field.
Enable "MSDN-DPNSS" from the Signaling Protocol field.
Trunk Attributes form
Enter the COS number programmed in step 3.
Complete the Non-dial in Trunks Answer Point fields.
Complete the Dial in Trunks: Incoming Digit Modification fields.
Digital Trunks form
Enter a Trunk Number, Trunk Service Number (from step 5), Circuit Descriptor (from step 4), and Interconnect Number.
Go to IMAT to complete programming.