Lucent Technologies 7820-0802-003 manual Signaling System 7 SS7, Introduction to SS7

Signaling System 7 (SS7) 18

Introduction to SS7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-1

System requirements for SS7 operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-2

Configuring an SS7 signaling gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-4

Cause codes for SS7 ASGCP calls to the TAOS unit . . . . . . . . . . . . . . . . . . . . . . . . 18-19

SNMP support for SS7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-23

Introduction to SS7

Signaling System 7 (SS7) is an internationally standardized general-purpose common-channel signaling system designed for use over a variety of digital circuit-switched networks. At the physical layer, it uses T1, T3, or E1 for data traffic and separate time-division multiplexing (TDM) circuits for signaling information.

The following two methods of integration with an SS7 network are supported, each of which requires a separate software license:

•Access SS7 Gateway Control Protocol (ASGCP). This method of integration enables the TAOS unit to terminate data calls in an SS7 network. The signaling gateway must be ICD for softswitch (formerly ASG). ICD stands for Internet Call Diversion.

•IP Device Control (IPDC). IPDC is a third-party proprietary protocol. This method of integration enables the TAOS unit to terminate both voice and data calls. The signaling gateway can be ICD for softswitch or Lucent Softswitch.

Table 18-1shows the protocols supported by these signaling gateway platforms.

Table 18-1. Signaling gateway platforms and protocol support

Platform	IPDC 0.12	ASGCP (Q.931+)
ICD for softswitch (formerly ASG)	Supported	Supported
Lucent Softswitch	Supported	Not supported

APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide 18-1