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SS7 Acronyms

Overview

This section provides a list of SS7 acronyms used in this book.

ANSI | American National Standards Institute
APC | Adjacent Point Code
CCIS | Common Channel Interoffice Signaling
CCS7 | Common Channel Signaling System 7
CIC | Circuit Identification Code
CPC | Call Processing Control
DCE | Data Communications Equipment
DPC | Destination Point Code
DTE | Data Terminal Equipment
ISDN | Integrated Services Digital Network
ISUP | ISDN User Part
L3P | Layer 3 Plus
MPC | Maintenance Process Control
MTP | Message Transfer Part
OPC | Originating Point Code
SCCP | Signaling Connection Control Part
SCP | Service Control Point
SLC | Signaling Link Code
SPRC | Signaling Procedure Control
SSP | Service Switching Point
SS7 | Signaling System 7
STP | Signal Transfer Point

See Signaling System Number Seven.
American National Standards Institute. ANSI administers and coordinates the U.S. voluntary standardization and conformity assessment system for the
telecommunications industry. More details on these standards may be
viewed at www.ansi.org.
The point code of the node adjacent to “own node” (SS7)
CCS. Network architecture using SS7 protocol for the exchange of information between telecommunications nodes and networks on an out-of-band basis.
See Circuit Identification Codes.
Data Communications Equipment. According to the RS-232-C standard, DCE devices are typically modems or printers. See DTE.
Destination Point Code
A number that addresses a node in a SS7 network.
Data Terminal Equipment. According to the RS-232-C standard, DTE devices are typically personal computers or data terminals. See DCE.
See Integrated Services Digital Network.
ISDN. Network architecture based on digital transmission, switching, and common channel signaling. Basic configurations include 2B+D called a Basic Rate Interface, and 23+D called a Primary Rate Interface. Outside North America, PRI is 30B+D.
See Integrated Services Digital Network User Part.
Protocol layer of the CSP.
See Message Transfer Part.
MTP. Message Transfer Part of the SS7 signaling protocol.
SCCP. The signaling connection and control part of the SS7 signaling protocol. For example, performs Global Title Translations (GTT), Subsystem Management.
SubSystem Prohibited. See also Service Switching Point.
SSP. Also called a Signal Switching Point. A switch that can recognize, route, and connect Intelligent Network calls as directed by a Service Control Point (centralized database). SSP can also be a Subscriber Service Point. In this case it is the switch portion of a “Combined Node” (STP/SSP combination node).This node is unique in the network as it has 2 valid point codes.
SS7. A common channel signaling protocol providing supervision, alerting, and addressing services.
STP. A node in the telephony network that normally does not handle voice. It acts as a message router, transferring signaling messages between switches.