Introduction to Signaling System 7.
1.1Primary Functions.
1.2SS7 as a global standards.
2 Signaling and Signaling Links.
3 Signaling Points.
3.1SSP (Service Switching Point or Signal Switching Point).
3.2SCP (Service Control Point).
3.3STP (Signal Transfer Point).
4 Signaling Link Types.
5 SS7 Protocol Stack.
5.1MTP Level 1.
5.2MTP Level 2.
5.2.1 SS7 Signal Units.
5.2.1.1Fill-In Signal Units (FISUs).
5.2.1.2Link Status Signal Units (LSSUs).
5.2.1.3Message Signal Units (MSUs).
5.3MTP Level 3.
5.4 ISDN User Part (ISUP).
5.5Telephone User Part (TUP).
5.6Signaling Connection Control Part (SCCP).
5.7Transaction Capabilities Applications Part (TCAP).
5.7.1 Transaction Portion.
5.7.2 Component Portion.
6. Conclusion.

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 The use of out-of-band signaling procedures offers considerable benefits over and above other signaling methodologies.
Primary Functions:
Provide call control,
Remote network management, and
Maintenance capabilities for the inter- office telephone network.
How SS7 Performs above functions:
SS7 performs these functions by exchanging control messages between SS7 telephone exchanges (Signaling points or SPs) and SS7 signaling transfer points (STPs).
SS7 as a global standards:
(SS7 or C7) is a global standard for telecommunications defined by the International
Telecommunication Union (ITU).
The standard defines the procedures and protocol by which network elements in the public switched telephone network (PSTN) exchange information over a digital signaling network to effect wireless (cellular) and wireline call setup, routing and control.
The ITU definition of SS7 allows for national variants such as the American
National Standards Institute (ANSI) and Bell Communications Research (Telcordia
Technologies) standards used in North America and the European …show more content…
The SIF contains the routing label followed by a 14-bit (ANSI) or 12-bit (ITU) circuit identification code (CIC).
 The CIC indicates the trunk circuit reserved by the originating switch to carry the call. The CIC is followed by the message type field (e.g., IAM, ACM, ANM, REL,
RLC), which defines the contents of the remainder of the message
Image Source 1http://www.eurecom.fr/~dacier/Teaching/Eurecom/Intro_computer_nets/Recommended/ss7.pdf
5. Telephone User Part (TUP):
In some parts of the world (i.e., China and Brazil), the Telephone User Part (TUP) is used to support basic call setup and tear-down. TUP handles analog circuits only. In many countries, ISUP has replaced TUP for call management.
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6. Signaling Connection Control Part (SCCP):
 SCCP provides connectionless and connection-oriented network services and global title translation (GTT) capabilities above MTP Level 3.
 A global title is an address (e.g., a dialed 800 number, calling card number or mobile subscriber identification number) that is
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