# Inward Dialing Prefixes

## Purpose

This form allows you to prefix Calling and Called Party Numbers with up to four digits for each type of number (International, National, Subscriber, and Unknown) being delivered.

The Inward Dialing Prefixes form is system-based and applies to all

- Euro-ISDN (E1), and

- QSIG protocol trunks (when Prefix Insertion is enabled in the ISDN Protocol form)

Use this form when performing the following tasks:

- Program Embedded PRI/QSIG

- QSIG Prefix Modification

## Field Descriptions

Parameter | Description | Default Value
Calling Party Number Prefix Insertion
International | Enter up to 4 digits when calling party number is an International number. Leave blank for no digit insertion. | Blank
National | Enter up to 4 digits when calling party number is a National number. Leave blank for no digit insertion.
Subscriber | Enter up to 4 digits when calling party number is a Subscriber (Local) number. Leave blank for no digit insertion.
Unknown | Enter up to 4 digits when calling party number is an Unknown type of number. Leave blank for no digit insertion.
Called Party Number Prefix Insertion
International | Enter up to 4 digits when called party number is an International number. Leave blank for no digit insertion. | Blank
National | Enter up to 4 digits when called party number is a National number. Leave blank for no digit insertion.