Signalling System #7 to Binary Level Training





Price $

Jan 16—20, 2017

Ljubljana, Slovenia

5 days



Feb 27—Mar 3, 2017

Ljubljana, Slovenia

5 days




Signaling System #7 (SS7) (aka C7 outside N. America) is the predominant signalling system for the public switched telephone network (PSTN) and also Public Land Mobile Networks (PLMNs). New packet networks for voice telephony also typically rely on SS7 for signalling. SS7 defines the procedures for setting-up, managing and clearing down calls between users, as well as non-circuit related signaling. For example it is used to provide Local Number Portability (LNP) as mandated by the FCC, Call Management Database Services (CMSDB) such as 800, 900, and 500 services (0500,0800,0898 etc within the UK), and Line Information Database Services (LIDB) such as calling card services. The SS7/C7 protocol is also a key component in providing Advanced Intelligent Networks (AINs) as defined by Bellcore and Intelligent Networks as defined by ITU-T.

The first day of the course is a "leveller" — introducing signalling, signalling requirements and associated terminology and concepts. The following three days depict a detailed picture of the architecture and protocol of SS7/C7, down to the binary level. The fifth day is solely hands on and looks at the latest SS7/C7 technological developments, and how SS7/C7 is being used as voice/data converge.


Training Method

  • Lectures
  • Exercises
  • Demonstrations
  • Training documentation (~500 pages)
  • Windows® based software for protocol analysis. SS7/C7 log files will be studied that will be distributed in electronic format. It may be beneficial if participants bring notebooks with Windows 98/NT/2000/ME

course details

  • Duration: Five days
  • Language: English
  • Documentation: English
  • Participants: General class size 5-20

Learning Outcomes

  • Knowledge of public switched telephone networks (PSTNs) and public land mobile networks (PLMNs)
  • Knowledge of signaling systems, associated terminology and concepts
  • Knowledge of the C7/SS7 protocol stack at binary level in the context of both cellular and fixed line systems
  • Insight into how to detect and locate problems
  • Knowledge of what the critical messages and parameters are
  • How to navigate C7/SS7 standards
  • How to analyze the C7/SS7 protocols
  • Understanding of service protocols including INAP and CAMEL
  • How to navigate service protocol standards including INAP, CAMEL and MAP

who should attend

  • Technical development and support professionals involved in the support and implementation of networks and services
  • Those professionals involved in the design and implementation of next-generation telecommunication solutions
  • Planners and developers of packet based carrier grade networks and services, which need to understand the present and future role of SS7/C7

Signaling Introduction

  • What is Signaling?
  • The Purpose of Signaling Explained
  • The History of Signaling Detailed
  • Subscriber VS Network Signaling
  • Why Signaling is a "Hot" Subject Detailed

Subcriber Signaling Protocols

  • Analog Access Signaling Technologies Introduced (Pulse, DTMF)
  • Digital Access Signaling Technologies Introduced (DSS1, DSS2)

Network Signaling Protocols

  • Analog Network Signaling Technologies Introduced (MF)
  • Digital Network Signaling Technologies Introduced (SS6, SS7)

Signalling Standards

  • The Purpose of Signaling Standards
  • History of Signaling Standards
  • Standards Bodies
  • World-wide SS7/C7 Standards
  • Regional SS7/C7 Standards
  • National SS7/C7 Standards

Signaling Concepts and TerminologY

  • Channel Associated Signaling (CAS)
  • CAS Examples
  • Common Channel Signaling (CCS)
  • CCS Examples
  • CCS and CAS Contrasted
  • CCS Signaling Modes Explained
  • Associated Mode
  • Quasi-Associated Mode
  • Non-Associated Mode

PSTN Overview

  • Basic PSTN Components
  • Signaling Between the Components
  • Network Hierarchy Explained
  • UK Network Examined
  • US Network Examined

SS7/C7 Overview

  • The SS7/C7 Protocol Stack against the OSI Model
  • SS7/C7 Functionality Overview
  • SS7/C7 Based Services - CNAM, LNP, CLASS, LIDB, SMS, EMS, PVN, E911, Do-Not-Call, and Supplementary Services
  • SS7/C7 as Thread of Convergence

SS7/C7 Network Elements

  • Service Switching Point (SSP)
  • Signal Transfer Point (STP)
  • Service Control Point (SCP)
  • N. American SS7 Network Architecture
  • European and Asian C7 Network Architecture
  • Link Types and Usage
  • Links and Linksets Explained
  • Routes and Routesets Explained

Message Transfer Part 1 (MTP 1)

  • Functions of MTP 1 Described
  • North American T1 Carrier Explained
  • European PRI E1 Carrier Explained
  • The Digital TDM Hierarchy for N. America Shown
  • The Digital TDM Hierarchy for Europe and Asia Shown

Message Transfer Part 2 (MTP 2)

  • Functions of MTP 2 Described
  • MTP 2 Overhead Shown
  • Signal Units Introduced
  • Message Signal Unit (MSU) Detailed
  • Link Status Signal Unit (LSSU) Detailed
  • Fill in Signal Unit (FISU) Detailed
  • SU Layers of Operation Explained
  • SU Delimination Explained
  • SU Alignment Explained
  • SU Error Detection/Correction Explained
  • Basic Error Correction Method Shown
  • Preventive Cyclic Retransmission Shown
  • Methods used for Link Error Monitoring
  • Link Management Detailed
  • Link Transmission Priorities Shown
  • Link Initial Alignment Shown


Message Transfer Part 3 (MTP 3)

  • Functions of MTP 3 Described
  • MTP 3 Overhead and Message Format Shown
  • Service Information Octet (SIO) Contents Explained
  • SubService Field (SSF) Explained
  • Service Indicator (SI) Explained
  • ITU Routing Label Shown
  • ITU Point Code Format Explained
  • ANSI Routing Label Shown
  • ANSI Point Code Format Explained
  • Assignment of the ANSI Point Code Explained
  • UK Routing Label Shown
  • UK Point Code Format Explained
  • Assignment of UK, US and International Point Codes Explained
  • International and National SS7/C7 Network Hierarchy Explained
  • Point Codes and Interconnect Explained
  • Relationship between L1, L2 and L3 Shown
  • Signaling Message Handling (SMH) Overviewed
  • SMH - Routing in More Detail (SLS and CIC) Fields
  • SMH - Heading Code (H0 / H1) Fields
  • Signaling Network Management (SNM) Overviewed
  • Signaling Traffic Management (STM) Overviewed
  • STM - Changeover/Changeback Examples
  • STM - Forced and Controlled Re-Routing Examples
  • STM - MTP Restart Example
  • STM - Management Inhibiting Example
  • STM - Flow Control & Traffic Reconfiguration Example
  • Signaling Link Management (SLM) Overviewed
  • SLM - Link Activation Demonstrated
  • SLM - Restoration Demonstrated
  • SLM - De-Activation Demonstrated
  • Signaling Link Test Explained
  • Processor Outage Explained
  • Signaling Route Management (SRM) Overviewed
  • SRM - Transfer Prohibited Example
  • SRM - Transfer Allowed Example
  • SRM - Route Set Test Example
  • MTP3b (Broadband) Described

Signaling Connection Control Part (SCCP)

  • Functions of SCCP Described
  • Signaling Information Field (SIF) for SCCP MSU Shown
  • SCCP Message Structure Detailed
  • Connectionless Services Explained
  • Connection-Orientated Services Explained
  • SCCP Management Procedures Overviewed
  • Traffic Information Management Detailed
  • Signaling Point Management Detailed
  • SCCP Routing Overviewed
  • Point Code Routing Explained
  • Subsystems and Subsystem Routing Explained
  • ITU, ANSI and 3GPP Subsystem Numbers Shown
  • Global Title Translation (GTT) Explained
  • GTT Examples
  • GTT Outcomes
  • CgPA/CdPA Fields Detailed
  • CgPA/CdPA Cellular and Fixed Line Examples
  • Address Indicator Explained
  • Global Title Indicator (GTI) Field Explained
  • Translation Type Field Explained
  • Encoding Scheme Field Explained
  • Numbering Plan Field Explained
  • Nature of Address Indicator Explained
  • Intra-PLMN Routing Example
  • Inter-PLMN Routing Example
  • ISUP Routing Example

Telephony User Part (TUP)

  • User Parts Described
  • User Part Overhead Shown
  • TUP/TUP+/TUP-E Explained and Overviewed
  • Signaling Information Field (SIF) for TUP MSU Shown
  • Two TUP Call Sequences Shown

National User Parts (NUPs)

  • Signaling Information Field (SIF) for NUP MSU Shown
  • NUP History
  • British Telecom NUP Example
  • Interconnection User Part (IUP) Example
  • Five IUP Call Sequences Shown

Narrowband ISDN User Part (N-ISUP)

  • N-ISDN User Part (N-ISUP) Overviewed
  • Signaling Information Field (SIF) for N-ISUP MSU Shown
  • N-ISUP Evolution Detailed
  • N-ISUP Variants Discussed
  • N-ISUP Message Groups Shown
  • En Bloc Signaling Explained
  • Overlap Signaling Explained
  • N-ISUP Message Format Explained
  • Common Messages Detailed
  • Five Call Sequences Shown
  • Common Parameters Detailed
  • Supplementary Services Overviewed
  • Three Supplementary Services Explained
  • International ISUP Detailed
  • ISUP Nationalisation Described
  • Broadband ISDN User Part (B-ISUP) Introduced

Transaction Capabilities Application Part (TCAP)

  • Transaction Capabilities Application Part (TCAP) Overviewed
  • Signaling Information Field (SIF) for TCAP within SCCP MSU Shown
  • Transactions Detailed
  • Transaction Sequences Shown
  • Components Detailed
  • Dialogue Portion Detailed
  • Error Handling Described
  • ANSI Message Contents
  • ITU Message Contents

Intelligent Network Application Protocol (INAP)

  • Intelligent Networks (INs) Described
  • IN Standards Explained
  • Intelligent Network Conceptual Model (INCM)
  • Intelligent Network Call Modelling Concepts
  • General Structure of the Capability Sets
  • INAP Overviewed
  • CAMEL Standards
  • CAMEL Overviewed

Mobile Application Part (MAP)

  • GSM Network Components
  • GSM Network Identifiers
  • MAP operations on 'A' Interface
  • MAP operations on 'B' Interface
  • MAP operations on 'C' Interface
  • MAP operations on 'D' Interface
  • MAP operations on 'E' Interface
  • MAP operations on 'F' Interface
  • MAP operations on 'G' Interface

SS7/C7 Security, Testing and Monitoring

  • Tools for Protocol Measurement
  • Overview of the Protocol Analyser
  • Validation and Compatibility Testing Explained
  • The ITU-T Test Specifications Introduced
  • Test Specification Creation
  • MTP2 Test Examples
  • MTP3 Test Examples
  • ISUP Test Examples
  • Supplementary Service Test Examples
  • SCCP Test Examples
  • TCAP Test Examples
  • SS7/C7 Network Vunerabilities
  • SS7/C7 Security Measures

Future Developments and Tomorrow's Signaling

  • Convergence of PSTN, Internet and Cellular
  • Media Gateways (MGs) and Controllers (MGCs) Described
  • Softswitches Described
  • Remote Access Servers (RASs) Described
  • Internet Offload Solutions Outlined
  • Session Initiation Protocol (SIP) Described
  • SIP/SS7 Interworking Described
  • MEGACO Described
  • MGCP/SCGP Described
  • SS7 Over IP (SIGTRAN) Discussed
  • Bearer Independent Protocol (BICC) Discussed
  • Evolution of SS7/C7 Beyond Circuit Switched Voice Calls Discussed


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Jan 16—20, 2017

Ljubljana, Slovenia

Feb 27—Mar 3, 2017

Ljubljana, Slovenia