# 3 Information Control Blocks

Overview

Purpose

This chapter lists the Information Control Blocks (ICBs) used in the EXS API for the CSP. The ICBs are listed by type (Action, Data, and Extended Data). The Action ICBs are listed first, then the Data ICBs, and finally the Extended Data ICBs. Within each of these three sections, the ICBs are listed in hexadecimal numerical order.

In this section:

Introduction to ICBs

Action ICBs

Data ICBs

Extended Data ICBs

SS7 and ISDN Values

DASS2/DPNSS Values

ICB. A standardized block that allows control data to be inserted in a standard way into API messages.