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Dialogic

DSI Signaling Server SGW Mode User Manual Issue 5

Chapter 1: Overview

1.1 General Description

The Dialogic

DSI SS7G21, SS7G22, SS7G31 and SS7G32 Signaling Servers (hereafter, sometimes referred

to as “Signaling Server(s)”), with an SGW Mode software license installed and enabled, operate as Dialogic

DSI Signaling Gateways (hereafter sometimes referred to as "Signaling Gateway(s)"). They provide an

interface between SS7 and IP networks, allowing SS7 information to be carried over IP to either IP resident

signaling points and applications (for example, a soft switch) or to another Signaling Gateway. IETF SIGTRAN

protocols are used to help to ensure interoperability with third party equipment.

Each Signaling Server may be purchased as one of several equipment types. The SS7G21 and SS7G22

equipment types use the same chassis and operate with the same software, but use different signaling

boards. The SS7G31 and SS7G32 equipment types use different chassis supporting different numbers of

signaling boards, but use the same software. See Section 1.4, “Hardware Overview” on page 10 for a

description of the Signaling Server hardware.

The Signaling Gateway uses the SIGTRAN M3UA protocol to "backhaul" SS7 signaling messages to IP

resident Application Servers, removing the need for Application Hosts to have dedicated SS7 MTP services or

hardware. Application Servers using the Signaling Gateway may be part of a single point code or multiple

point codes.

The Signaling Gateway M3UA architecture uses open standards interfaces, providing flexibility, scalability and

resilience. It is easy to add or reconfigure M3UA Application Servers and Signaling Gateways to address

demands for new services or increased capacity.

The Signaling Gateway also supports SIGTRAN M2PA protocol to talk to other Point Codes over IP links,

rather than TDM. M2PA may be used to connect within the central office, or for longhaul links over IP.

The SS7G21 and SS7G22 Signaling Servers are shipped in Signaling Unit Interface (SIU) Mode. To enable

SGW functionality, order a SS7SBG20SGW license.

The SS7G31 and SS7G32 Signaling Servers are shipped in TEST Mode - without any operation mode license

installed. To enable SGW functionality, order either a SS7SBG30SGWU,SS7SBG30SGWL or SS7SBG30SGWJ

license. See Section 2.2, “Software Licenses” on page 18 for more information about the available licenses,

and Section 3, “Licensing, Installation and Initial Configuration” on page 21 for information about license

purchase, installation and operation.

A Signaling Server with the SGW Mode license installed and enabled is referred to as a “Signaling Gateway”

throughout this manual.

The Signaling Server, if equipped with the SIU Mode software license, operates as a Signaling Interface Unit

(SIU), providing an interface to SS7 networks for a number of distributed application platforms via TCP/IP

LAN. In this mode, the unit implements the SS7 Message Transfer Part (MTP) and a number of User Parts

(ISUP, SCCP, TCAP, MAP, IS41 and INAP). Refer to the Dialogic

DSI Signaling Servers SIU Mode User

Manual for details of this operation mode.

The Signaling Server, if equipped with the DSC Mode software license, operates as a Digital Signaling

Converter providing signaling conversion between pairs of network-side or access-side telephony protocols.

Refer to the Dialogic

SS7G21 and SS7G22 Signaling Servers DSC Mode User Manual for details of this

operation mode. DSC Mode operation is not available on the SS7G31 or SS7G32 products.

Refer to section Section 3, “Licensing, Installation and Initial Configuration” on page 21 for procedures about

the purchase and installation of software option licenses. Refer to Chapter 3, “Licensing, Installation and

Initial Configuration” on page 21 for procedures required to configure the Signaling Server for SGW Mode

operation.

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