# Programming Embedded MSDN/DPNSS Trunks

## Before You Begin

Ensure that:

- the T1/E1 Combo Card or Dual T1/E1 Framer Module is installed and programmed.

- the Interconnect Restriction and Intercept Handling is programmed for each trunk.

For more information, see Embedded MSDN/DPNSS trunks - Product Overview.

## Programming

To program Embedded MSDN/DPNSS trunks:

1. Digital Link Descriptors form

- Enter "A" or "B" in the Address for Message Control field.

- Enter "DPNSS" in the Integrated Digital Access field.

- Select "NT" or "LT" for Termination Mode.

- For E1 Trunks, select "75" or "120" for E1 Impedance (120 for twisted pair or 75 for co-ax).

2. Digital Links form

- Enter the Digital Link Descriptor Number programmed in step 1.

3. Class of Service Options form

- Set the ANI/DNIS ISDN Number Delivery Trunk field to "Yes".

4. Trunk Circuit Descriptors - MSDN-DPNSS-DASS II form

- Select "UNIVERSAL E1" or "UNIVERSAL T1" in the Card Type field.

- Enable "Incoming" or "Outgoing" from the Dual Seizure Priority field.

- Select "MAIN PBX" from the Far End Connection field.

- Enable "MSDN-DPNSS" from the Signaling Protocol field.

5. Trunk Attributes form

- Enter the COS number programmed in step 3.

- Complete the Non-dial in Trunks Answer Point fields
  OR
  Complete the Dial in Trunks: Incoming Digit Modification fields.

  NOTE: Dial-in trunks used as incoming trunks must always have an entry in the Absorb column. (You must enter "0" if no digits are to be absorbed. If you leave this field as Blank, calls will fail).

6. Digital Trunks form

- Complete the Trunk Number, Trunk Service Number (from step 5), Circuit Descriptor (from step 4), and Interconnect Number fields.

7. Network Synchronization form (optional)

- Assign a source connection to a Network Source Clock.

8. Shared System Options form

- Ensure that option "DPNSS/QSIG Diversion Enabled" is set to "Yes" (optional, but strongly recommended)

- If required, set the Maintain Original Forward or Reroute Reason to "Yes". With this option enabled, the system maintains and displays on the nominated party's telephone or console the original reason for forwarding or rerouting a call.