# 8 ISDN

Purpose

This chapter describes the Dialogic implementation and features of Integrated Services Digital Network (ISDN), Primary Rate Interface (PRI). References to ISDN functionality in this chapter involve both the ISDN PRI card and the ISDN Series 3 card.

In this section:

Introduction to ISDN

ISDN Architecture

ISDN Software Features

Configuring ISDN PRI

Network Side Euro-ISDN

Span Configuration

ISDN D Channel Configuration

B Channel Configuration

Configuring the Backup D Channel

Optional Information Elements

Other Optional ISDN Configurations

ISDN Call Processing

ISDN Redundancy

ISDN Congestion Control

ISDN Bearer Connection Independent Supplementary Services

Link Access Protocol D-Channel (LAPD)

LAPD Architecture Overview

LAPD Functional Message Breakdown

LAPD Configuration Sequence

LAPD Inter-Module Configuration and Startup

LAPD and Host Communication

LAPD Example Call Flows

Subrate Switching

Support for ISDN Busy Out Channel with PPL Event Request

ISDN Over Ethernet

FR5099 - ISDN SUSPEND / ISDN RESUME Message Support

- Call Setup - User Side

- Call Setup - Network Side

- L3P/L5 Events

ISDN. Network architecture based on digital transmission, switching, and common channel signaling. Basic configurations include 2B+D called a Basic Rate Interface, and 23+D called a Primary Rate Interface. Outside North America, PRI is 30B+D.
See Integrated Services Digital Network.
PRI. One of two basic ISDN interface configurations providing 23 (30 outside of North America) Bearer channels (64 Kbps data) and 1 Data signaling channel (16 Kbps control and signaling data). Commonly refered to as ISDN PRI or 23B+D interface (30B+D outside of North America).