My Learning Phase

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            Signaling System No. 7 ( SS7 ) is a set of telephony signaling protocols which are used to set up most of the world's public switched telephone network telephone calls. The main purpose is to set up and tear down telephone calls. Other uses include number translation, prepaid billing mechanisms, short message service (SMS), and a variety of other mass market services. SS5 and earlier systems used in-band signaling(In telecommunications, In-band signaling is the sending of metadata and control information in the same band, on the same channel, as used for data.). SS6 and SS7 implement out-of-band (out-of-band control signaling, signaling bits are sent in special order in a dedicated signaling frame.) signaling protocols.         The term signaling , when used in telephony, refers to the exchange of control information associated with the establishment of a telephone call on a telecommunications circuit. An example of this control information is the digits dialed by t