SS7 - Performance Technologies, Inc. www.pt.com Table of...

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Performance Technologies, Inc . www.pt.com Page 2 of 2 08/22/01 © 2000-2001 Performance Technologies, Inc. All Rights Reserved. Table of Contents SS7 Tutorial. .................................................................................................................................... 1 SS7 Tutorial . ................................................................................................................................ 3 Overview. .................................................................................................................................. 3 SS7 Protocol Stack . ................................................................................................................. 6 Message Transfer Part. ............................................................................................................ 8 ISDN User Part. ...................................................................................................................... 13 Signaling Connection Control Part. ........................................................................................ 20 Transaction Capabilities Application Part. .............................................................................. 21 Other SS7 Information. ........................................................................................................... 23 Bibliography. ........................................................................................................................... 23 List of Figures Figure 1 . SS7 Signaling Points. ...................................................................................................... 4 Figure 2. SS7 Signaling Link Types. ............................................................................................... 5 Figure 3 . The OSI Reference Model and the SS7 Protocol Stack . ................................................ 6 Figure 4 . SS7 Signal Units. ............................................................................................................ .8 Figure 5 . Message Type Length Indicator Value(s). ....................................................................... 9 Figure 6 . Service Indicator Values. ............................................................................................... 11 Figure 7 . ANSI vs. ITU-T SIO and SIF. ......................................................................................... 12 Figure 8 . Basic ISUP Signaling. .................................................................................................... 14 Figure 9 . ISUP Message Format . ................................................................................................. 16 Figure 10 . ANSI and ITU-T Initial Address Message (IAM) Format . ............................................ 17 Figure 11 . ANSI and ITU-T Address Complete Message (ACM) Format. .................................... 18 Figure 12 . ANSI and ITU-T Answer Message (ANM) Format . ..................................................... 18 Figure 13 . ANSI and ITU-T Release (REL) Message Format. ..................................................... 19 Figure 14 . ANSI and ITU-T Release Complete (RLC) Message Format . .................................... 19 Figure 15 . SCCP Message Format. .............................................................................................. 21
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Performance Technologies, Inc . www.pt.com Page 3 of 3 08/22/01 © 2000-2001 Performance Technologies, Inc. All Rights Reserved. SS7 Tutorial Overview Common Channel Signaling System No. 7 (i.e., SS7 or C7 ) is a global standard for telecommunications defined by the International Telecommunication Union (ITU) Telecommunication Standardization Sector (ITU-T). The standard defines the procedures and protocol by which network elements in the public switched telephone network (PSTN) exchange information over a digital signaling network to effect wireless (cellular) and wireline call setup, routing and control. The ITU definition of SS7 allows for national variants such as the American National Standards Institute (ANSI) and Bell Communications Research (Telcordia Technologies) standards used in North America and the European Telecommunications Standards Institute (ETSI) standard used in Europe. The SS7 network and protocol are used for: basic call setup, management, and tear down wireless services such as personal communications services (PCS), wireless roaming, and mobile subscriber authentication local number portability (LNP) toll-free (800/888) and toll (900) wireline services enhanced call features such as call forwarding, calling party name/number display, and three-way calling efficient and secure worldwide telecommunications Signaling Links SS7 messages are exchanged between network elements over 56 or 64 kilobit per second (kbps) bi-directional channels called signaling links . Signaling occurs out-of-band on dedicated channels rather than in-band on voice channels. Compared to in-band signaling, out-of-band signaling provides: faster call setup times (compared to in-band signaling using multi-frequency (MF) signaling tones) more efficient use of voice circuits support for Intelligent Network (IN) services which require signaling to network elements without voice trunks (e.g., database systems) improved control over fraudulent network usage
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This note was uploaded on 08/08/2011 for the course CS 310 taught by Professor Aartisingh during the Spring '11 term at National Institute of Technology, Calicut.

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SS7 - Performance Technologies, Inc. www.pt.com Table of...

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