# CPN Substitution

## Purpose

The outgoing CPN feature delivers the calling party's DID number to the network on embedded PRI trunks and embedded BRI trunks ("T" interface only). You can define CPN substitution for individual DID numbers or ranges of DID numbers.

Use this form to indicate which substitutions to apply on a link or to program default CPN values if no CPN substitution is indicated. Use the DID Ranges for CPN Substitution form to associate DID numbers with CPN substitution values.

Use this form when programming the following features or when performing the following tasks:

- Calling Party Number (CPN) Substitution

- Program Embedded PRI/QSIG Trunks

- Program Embedded BRI Trunks

NOTES

1. You can also program CPN substitution for individual directory numbers in the Associated Directory Numbers form. Programming in the Associated Directory Number form takes precedence over programming in this form. Thus, if there is CPN substitution programmed for an individual DN in the Associated Directory Numbers form, it is followed and the substitution in this form is ignored. DN-based CPN substitution applies to calls over embedded PRI/DPNSS trunks and SIP trunks.

2. CPN substitution is also available on SIP trunks. However, to specify which substitutions apply on a link you must use the SIP Peer Profile form instead of the CPN Substitution form. For complete programming details, see Calling Party Number (CPN) Substitution.

## Conditions

None

## Field Descriptions

Parameter | Description | Default Value
Controller Module | System-generated, protected field. Identifies the module position (1-4) in the controller. |
Port | System-generated, protected field. Identifies the port (1 or 2) in the module. |
Link Number | System-generated, protected field. |
Protocol | System-generated, protected field. From the ISDN Protocol form. |
Default Voice CPN | Enter a default CPN substitution value up to 14 digits (0-9) in length. The system uses this value for DID numbers not associated with the link. | Blank
Default Data CPN | Enter a default CPN substitution value up to 14 digits (0-9) in length. The system uses this value for DID numbers not associated with the link. | Blank
Index | Enter an index number between 1 and 100. Index numbers refer to substitutions programmed in the DID Ranges for CPN Substitution form. If a DID number sent over this link matches the DID range programmed for this index number, then the system makes the substitution. | Blank