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The software tool SnoopSnitch can warn when certain SS7 attacks occur against a phone, [20] and detect IMSI-catchers that allow call interception and other activities. [ 21 ] [ 22 ] In February 2016, 30% of the network of the largest mobile operator in Norway, Telenor , became unstable due to "unusual SS7 signaling from another European operator".
SS7 or SS-7 may refer to: Signalling System No. 7, a set of telephony signalling protocols; SS-7 Saddler, the NATO reporting name of R-16 missile; China Railways SS7, an electric locomotive model in China; Super Socket 7, a chip socket introduced by AMD
In mobile cellular telephony networks like GSM and UMTS the SS7 application MAP is used. Voice connections are Circuit Switched (CS) and data connections are Packet Switched (PS) applications. Some of the GSM/UMTS Circuit Switched interfaces in the Mobile Switching Center (MSC) transported over SS7 include the following: B -> VLR (uses MAP/B).
The ISDN (Integrated Services Digital Network) User Part or ISUP is part of Signaling System No. 7 (SS7), which is used to set up telephone calls in the public switched telephone network (PSTN). It is specified by the ITU-T as part of the Q.76x series.
An SS7 probe is a physical device to obtain signalling and/or bearer information from a telecommunications network, such as the PSTN or a corporate telephone system. The probe passively monitors the E1 / T1 or SDH / SONET bearer channels, and extracts the signalling information for onward presentation to an application.
INAP stands for Intelligent Network Application Protocol or Intelligent Network Application Part.It is the signalling protocol used in Intelligent Networking (IN). [1] It is part of the Signalling System No. 7 (SS7) protocol suite, typically layered on top of the Transaction Capabilities Application Part (TCAP).
The Message Transfer Part (MTP) is part of the Signaling System 7 (SS7) used for communication in Public Switched Telephone Networks. MTP is responsible for reliable, unduplicated and in-sequence transport of SS7 messages between communication partners. MTP is formally defined primarily in ITU-T recommendations Q.701, Q.702, Q.703, Q.704 and Q.705.
An SSP telephone exchange receives a call to an 0800 number. This causes a trigger within the SSP that causes an SCP (Service Control Point) to be queried using SS7 protocols (INAP, TCAP). The SCP responds with a geographic number, e.g. 0121 XXX XXXX, and the call is actually routed to a phone. By this architecture: