SS7, Tools that can intercept sms ( OTP)

Cocainacola

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Signaling in telephony is the exchange of control information associated with the setup and release of a telephone call on a telecommunications circuit.[4]:318 Examples of control information are the digits dialed by the caller and the caller's billing number.
When signaling is performed on the same circuit as the conversation of the call, it is termed channel-associated signaling (CAS). This is the case for analogue trunks, multi-frequency (MF) and R2 digital trunks, and DSS1/DASS PBX trunks.[citation needed]
In contrast, SS7 uses common channel signaling, in which the path and facility used by the signaling is separate and distinct from the signaling without first seizing a voice channel, leading to significant savings and performance increases in both signaling and channel usage.[citation needed]
Because of the mechanisms in use by signaling methods prior to SS7 (battery reversal, multi-frequency digit outpulsing, A- and B-bit signaling), these earlier methods can not communicate much signaling information. Usually only the dialed digits are signaled during call setup. For charged calls, dialed digits and charge number digits are outpulsed. SS7, being a high-speed and high-performance packet-based communications protocol, can communicate significant amounts of information when setting up a call, during the call, and at the end of the call. This permits rich call-related services to be developed. Some of the first such services were call management related, call forwarding (busy and no answer), voice mail, call waiting, conference calling, calling name and number display, call screening, malicious caller identification, busy callback.




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