The telecommunications ( telecom) industry developed Signaling System 7 before digital encryption and authentication were widely adopted. This means that SS7 messages and service can be relatively easily listened in on and forged.
SS7 is a longstanding telecommunications protocol and standard for both landline and mobile phone service.
Signaling System 7 (SS7) is an international telecommunication protocol standard that defines how the network elements in a public switched telephone network ( PSTN) exchange information and control signals. Nodes in an SS7 network are called signaling points.
There are three main types of signaling nodes in a SS7 network: Service Switching Points (SSPs), Signal Transfer Points (STPs) and Service Control Points (SCPs). SSPs originate or terminate a call and are the initial point on the SS7 network. The control signals are routed through various STPs, which operate as interconnected switches on the SS7 network. The SCPs determine how to route a call or set up and manage some special feature.
Integrated Services Digital Network (ISDN) could also be used, enabling digital voice or data service at a relatively high speed, for the time, of up to 128 Kbps or 1.5 Mbps for a full T1 line. ISDN did not see wide adoption in the consumer market because, by the time it was widely available, 56.6 Kbps modems were becoming available as well. Asymmetric Digital Subscriber Line service widely superseded ISDN data service.
SS7 is a high-performance, packet-based system that can transmit much information related to the call and user. The extra data channel offered by SS7 enabled many of the modern conveniences in telephone service. It can also be used for services not directly related to voice calls. Because of the level of access SS7 provides to the underlying infrastructure and need for an extra dedicated signal line, SS7 is mainly used between telephone network switches and is not used at the local level to connect a local exchange to the customer.
It may also be called Signalling System No. 7, Signaling System No. 7 or -- in the United States -- Common Channel Signaling System 7, or CCSS7.
This course is designed to provide an overview of SS7 for communications professionals, software engineers, system engineers, networking professionals, marketing and sales professionals, information systems engineers, and other telecommunications/data communications individuals who plan on using or evaluating SS7 and related products, applications and services..
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SS7 protocols date back to the 1970s when the concerns regarding signalling security were not as significant as today. At that time, safety protocols included the physical security of hosts and communication channels, making it impossible to obtain access to the SS7 network via a remote unauthorized host. Moreover, access to signalling would require much more effort and high-tech hardware.
SS7 protocols date back to the 1970s when the concerns regarding signalling security were not as significant as today. At that time, safety protocols included the physical security of hosts and communication channels, making it impossible to obtain access to the SS7 network via a remote unauthorized host.
Messages in Category 3.1 can be monitored by validating the past/current VLR address regarding the received packet.
Signalling security, focused on eliminating network protection weaknesses, should also help MNOs keep their brand reputation strong.
Fraudulent attacks over the signalling network can harm not only subscribers and mobile networks as a whole but also infrastructures (within one building or even the entire urban area), IoT and M2M ecosystems.
Again, security issues of the SS7 signalling network and its vulnerabilities are not a new topic – industry leaders have always been well aware of the risks. However, only in recent years, the problem has drawn more and more attention.
Participants undergoing Signaling in Telecom Networks: SS7, SIGTRAN & SIP program should have basic knowledge of mobile telecom network technologies like GSM, CDMA and WCDMA, with IP understanding.
Signaling in Telecom Networks: SS7, SIGTRAN & SIPis intended to provide a sound introduction to the world of telecommunications signaling. It is particularly designed for those who have little or no signaling knowledge. It provides a solid foundation to help you grasp signaling ideas, concepts, terminology, and methods.
Today, Signaling System No. 7is the most advanced and widely used signaling system for both cellular and fixed-line Telecommunications networks along with evolving Signalling protocols such asSIGTRAN(Signaling Transport) & SIP(Session Initiaton Protocol).