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Chapter 7 Configuration Overview

Figure 8 demonstrates a Signaling Gateway communicating over SIGTRAN links with two ASPs. ASP 1 is

running two AS instances, AS1 processes CICs 1 to 128 in PC 2, and AS2 processes CICs 129 to 256 also in

PC 2. ASP 2 is also running two AS instances, AS3 processes CICs 1 to 128 in PC 3 and AS2 processes CICs

129 to 256 also in PC 2. Note that AS2 is running on ASP1 and ASP2. The two ASPs could be load sharing

processing for the AS or one could be active, while the other standby. The configuration of load sharing is

performed by the ASPs. Example MML for the above configuration is:

Linkparatext: SNLINK=1, SNTYPE=SGM3UA, END=S, IPADDR=193.145.185.152,

SS7MD=ITU14, NC=1, LABEL=ASP1;

Linkparatext: SNLINK=2, SNTYPE=SGM3UA, END=S, IPADDR=193.145.185.153,

SS7MD=ITU14, NC=1, LABEL=ASP2;

Linkparatext:RAS=1, NC=1, DPC=2, RC=1, LABEL=AS1;

Linkparatext:RAS=2, NC=1, DPC=2, RC=2, LABEL=AS2;

Linkparatext:RAS=3, NC=1, DPC=3, RC=3, LABEL=AS3;

Linkparatext:RAS=1, SEQ=1, SNLINK=1;

Linkparatext:RAS=2, SEQ=1, SNLINK=1;

Linkparatext:RAS=2, SEQ=2, SNLINK=2;

Linkparatext:RAS=3, SEQ=1, SNLINK=2;

7.3 Routing Configuration

The routing model for the Signaling Gateway can be broken into three parts; incoming route selection,

routing key processing and destination selection.

An Incoming Route (IR) identifies the side from which signaling data originates. MTP messages are

considered to arrive from either the MTP domain over an SS7 link set (LS) using MTP2 or M2PA SS7 links

(C7LINK) or the SIGTRAN IP domain over a M3UA SIGTRAN link (SNLINK). The SS7 link set or M3UA

SIGTRAN link identifies the network (NC) and SS7 format (SS7MD) of the message. The IR configuration

either explicitly identifies a destination or a routing key table (RKTAB) that is used to identify a destination

(DEST). Incoming routes are managed using the SGIRx commands.

If the Signaling Gateway determines that a Routing Key Table (RKTAB) should be looked up, data from the

message is compared with routing keys components (such as NC, SI, NI, OPC, DPC, CICs) in a routing key

table. If a match is found and the Destination Point (DEST) for that routing key combination is in service, the

routing key’s Destination Point is used otherwise if the incoming route also had a Destination Point

associated with it, then that default destination is used. Routing keys are managed using the SGRKx

commands.

A Destination Point (DEST) can route a message to a Remote Application Server (RAS) or to MTP (using

MTP2 or M2PA SS7 links) for routing based on Point Code. MTP routing can be selected by specifying an

RTPRI of MTP. RAS routing can be selected by specifying an RTPRI of NONE and identifying the RAS that the

messages should be routed to. Destinations are managed using the SGDPx commands.

Note: In many configurations, routing key analysis is not required and the user can configure an

Incoming Route to go directly to a Destination without having to explicitly provide routing key

information, such as Destination Point Codes, for every eventual destination.

Figure 9. Routing Configuration Example

IR1

IR2

RK1

DEST1

DEST2

AS1

C7RT 1

Signaling Gateway

Application

Server



DPC 2

CICs 1 to 128

DPC 3

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 175 176

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