What is SS7? An Introduction to Signaling System 7
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The document discusses the relevance of SS7 networks and the role of SIGTRAN for transferring SS7 signaling over IP. It outlines the architecture, key components, and various use cases of SS7 and SIGTRAN, emphasizing their importance for global voice and SMS connectivity. Additionally, it presents Telcobridges as a provider of signaling gateways and STPs with innovative solutions for modernizing and extending SS7 networks.
What is SS7? An Introduction to Signaling System 7
- 1. Extending the Life of SS7 Networks 1 with SIGTRAN and STPs
- 2. 2 Today’s Presenters: Alan D Percy Chief Marketing Officer alan.percy@telcobridges.com Marc St-Onge Technical Director of Sales marc.stonge@telcobridges.com
- 3. 3 What to Expect: Introductions Background SS7 Network Elements Signaling Functions for SS7 The Role of SIGTRAN for transport SS7 & SIGTRAN Use Cases Your Questions A D N E G A
- 4. TelcoBridges Inc. • Manufacturer of VoIP gateways, signaling gateways, and SBC software for carriers and enterprises • Employee Owned • Founded in 2002 • Employees: ~40 • Headquarters: Montreal, Canada • Hardware & software R&D as well as production of its products in Montreal • Sales/Support offices: Montreal, Turkey, Hong Kong • 24/7 technical support 4 TelcoBridges HQ
- 5. Worldwide Success • Global carrier network solutions • Focus on reliability and service • Technology innovator 5
- 6. WHAT IS SS7? An Introduction to Signaling System 7 6
- 7. 7 SS7 is very much alive! • It is the core of the global PSTN • It ensures global voice & SMS connectivity • And it is growing at 3 to 4% per year SMS traffic is increasing More roaming Increasing number of MVNOs Local number portability, 1-800 numbers
- 8. 8 Let’s Start at the Beginning… Montreal Telephone Exchange (c. 1895)
- 9. 9 The Digital Telephone Network The 1970s: • Space Flight • 1973 Oil Crisis • Digital Computing Age • Growth of Telephone Service • Global Telecommunications • Adoption of Digital Telephony • Birth of CCITT SS7
- 10. 10 A Little Background • Channel Associated Signaling (CAS) • Signaling is carried with the voice path (analog, T1 RBS, E1 R2) • Common Channel Signaling (CCS) • Signaling is carried separate from the voice path (SS7) Voice Signaling Voice Signaling
- 11. 11 A Little Background • Common Channel Signaling (SS7) Advantages: • More efficient use of voice paths/circuit • More bandwidth available for signaling • More secure • More flexible architectures Voice Signaling
- 12. 12 SS7 Service Switching Points SSP Voice Paths Signaling Links SSP Service Switching Point (SSP) Exchange A Exchange B Link Set From: Engineering Networks for Synchronization, CCS 7, and ISDN by P.K. Bhatnager
- 13. 13 Point Codes Zone Identification Area/Network Identification Signaling Point Identification 3 bits 8 bits 3 bits Format for International Signaling Point Code (14-bits) Network Identification Network Cluster Cluster Member 8 bits 8 bits 8 bits Format of Point Code for US Network (24-bits)
- 14. SS7 Signaling Transfer Point • Signaling Transfer Point • “Router” for SS7 messages • Simplifies network topology • Allows “Spoke and Hub” 14 SSP Voice/Data Paths Signaling Links SSP Exchange A Exchange B STP Signaling Transfer Point SSP Exchange C
- 15. SS7 Service Control Point • SS7 Node that delivers a service to network • Database services: • Caller Name database (CNAM) • Local number portability • Home Location Register (HLR) • Toll Free Number database • Messaging Services (SMS) 15 SCP SSP Voice/Data Paths Signaling Links SSP Exchange A Exchange B STP Service Control Point SSP Exchange C
- 16. SS7 Protocol Stack 16 MTP Level 1 MTP Level 2 MTP Level 3 ISUP Physical Data link Network Application Presentation Session Transport SCCP TCAP SS7
- 17. SS7 Signaling Example 17 ISDN User Originating Exchange Transit Exchange Terminating Exchange ISDN User Setup IAM Setup ACK Info Alert Connect SAM ACM ANM IAM ACM ANM Setup Connect Access Signaling On D-Channel Interoffice Signaling On Signaling Links Access Signaling On D-Channel From: Engineering Networks for Synchronization, CCS 7, and ISDN by P.K. Bhatnager (Part of Called Party Address) (Remaining Address)
- 18. 18 SS7 Network Architecture SSP C STP 1 STP 2 SCP A STP 3 STP 4 SCP B SSP A SSP B A A A A C F B D D B C A A A A Voice circuit SS7 link SSP = Service Switching Point STP = Signaling Transfer Point SCP = Service Control Point A = Access Link B = Bridge Link C = Cross Link D = Diagonal Link F = Fully Associated - Class 5 switch - Class 4 switch - MSC - LNP Database - HLR - SMSC
- 19. User Application 19 SS7 Use Case: CNAM Lookup Accessing Caller Name ID database SCP STP CNAM API Terminating Service Provider CNAM Gateway
- 20. SIGTRAN Transport of SS7 signaling over IP 20
- 21. SS7 Protocol Stacks 21 MTP Level 1 MTP Level 2 MTP Level 3 ISUP Ethernet IP Physical Data link Network Application Presentation Session Transport SCTP M2PA SCCP TCAP SIGTRAN SS7 MTP Level 3 ISUP SCCP TCAP Ethernet IP SCTP M3UA ISUP SCCP TCAP
- 22. SIGTRAN standards • Defined by the IETF • SCTP (Stream Control Transmission Protocol) • RFC 4960 • Message oriented, reliable, in-sequence delivery • Supports multi-homing for redundancy • M2PA (MTP2 User Peer-to-Peer Adaptation Layer) • RFC 4165 • Equivalent to SS7 TDM links, but over IP • M3UA (MTP3 User Adaptation Layer) • RFC 4666 • Enables the transport of higher-layer protocols over IP 22
- 23. 23 SIGTRAN Use Cases 1. Migrate SS7 TDM links to IP 2. Extend the life your STPs using SIGTRAN 3. Modernize your STPs 4. Bridge old and new SS7 networks 5. SS7 link transport via IP https://www.youtube.com/watch?v=aUBj4GUFaiM
- 24. 1. SS7 link migration 24 - Eliminates recurring cost of leased line - 100% transparent for the switch - Higher reliability due to IP network IP network Transmission network STP STP SS7 Switch M3UA MTP2 TSG800
- 26. Tsig Product Line 26 Confidential Model TSG800 TSG3200 Applications Signaling Gateways & STP Signaling Gateways & STP T1/E1 1-16 64 DS3 - 3 OC3/STM-1 - 1 Ethernet Ports 6 5
- 27. 27 Intro: Tsig TSG800 Signaling gateway/STP • Up to 16 x T1/E1 for SS7 on TDM • 6 x GigE ports for SIGTRAN, management, SNMP • Redundant power supplies (DC or AC) Low-speed Links High-speed links SIGTRAN associations MTP3 routes SCCP/ GTT MSU/s 64 2 64 512 384 5,000
- 28. 28 Learn More: • More on SS7 at: • https://docs.telcobridges.com/tbwiki/SS7 • Information on TSG800 at: • https://www.telcobridges.com/products/ tsig-signaling-gateways/tsg800 • Request a consultation at: • https://www2.telcobridges.com/SS7Consult
- 29. Video Library on YouTube • ProSBC Training Modules • Recorded webinars • How-to Tutorials • Customer interviews • Frequently Asked Questions • Recorded podcasts • And more… 29 youtube.com/telcobridges
- 30. Enabling the Migration to Cloud Communications 30 www.telcobridges.com www.prosbc.com sales@telcobridges.com Youtube.com/telcobridges