# 5 TUP, BT IUP & SSUTR2

Purpose

This chapter provides information about the Telephone User Part (TUP), which is a module within the SS7 stack that defines the telephone signaling necessary for the processing of international and national calls. Like ISUP, the term "user" in the context of TUP refers to any functional entity that uses the transport capability provided by SS7’s Message Transfer Part (MTP). TUP is flexible enough to handle most required national and international parameters. The Dialogic TUP interface includes the ability for the host to manage the TUP Virtual CIC call control and circuit management. The Dialogic TUP includes the SSUTR2 variant which is used to define the signaling interface between a fixed network and a mobile network.

More Information

See the Appendix at the end of this book for tables of TUP-supported messages, Field IDs for supported fields and restrictions on the implementation of TUP messages.

In this section:

Introduction to TUP Call Control

TUP Incoming Call Setup

TUP Outgoing Call Setup

TUP Virtual CIC

TUP Virtual CIC Call Control Management and Maintenance

Configuring Virtual CIC Format

Introduction to BT IUP

Configuring BT IUP on an SS7 Card

BT IUP Call Flows

BT IUP Configuration Examples

BT IUP Signaling Stack Congestion Control

Enabling Congestion Control for BT IUP

Introduction to SSUTR2

Configuring SSUTR2

SSUTR2 Call Flows

Telephone User Part
See Signaling System Number Seven.
See Integrated Services Digital Network User Part.
MTP. Message Transfer Part of the SS7 signaling protocol.
See Message Transfer Part.
See Circuit Identification Codes.