Ensure that:
The T1/E1 Combo Card, or Dual T1/E1 Framer Module is installed and programmed.
Interconnect Restriction and Intercept Handling is programmed for each trunk.
To program T1/D4 trunks:
Digital Link Descriptors form
Select "T1D4" from the Integrated Digital Access field.
T1 supports CSU mode and DSX-1 mode.
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" (if provided).
Complete one of the following:
Trunk Attributes form
For E&M trunks, set Release Link Trunk to "E&M"
For Non-dial in Trunks (CO and E&M), set Day, Night1, and Night2 Answer Points
For Dial in Trunks (DID), set the number of digits to absorb in the Incoming Digit Modification-Absorb field
Digital Trunks form
Enter a Trunk Number, Trunk Service Number (from step 5), Circuit Descriptor (from step 4), and Interconnect Number.
Network Synchronization form (optional)
Assign a source connection to a Network Source Clock.
Trunk Groups form
For outgoing trunks, assign the trunk number (from step 6) to a trunk group.