signaling connection control part (SCCP)


Definition:
signaling connection control part (SCCP): 1. A component part of SS7 protocol that provides additional functions to the message transfer part (MTP) to provide for Connectionless and Connection Oriented network services to transfer signaling information between exchanges and specialized centers in telecommunication networks. The combination of the MTP and the SCCP is called Network Service part. [T1.235-1993] 2. The part of SS7 that provides additional functions to the MTP to cater to both connectionless as well as connection-oriented network services and to achieve an OSI-compatible network service. [T1.110-1987] History

History
The rapid expansion of telecommunications after 1945 has brought increasing demands for line capacity on telecom networks. For over 50 years signaling, connecting and managing calls, were made in-band. This entailed that when someone made a call, the number was sent from switch to switch over the actual voice-connection. If the person at the other end of the line was on the phone the connection was occupied the enire distance between the two persons for several seconds without the call being completed. There was room for imporovement. Signaling Goes Digital In the mid-1960s new digital connections and switches made it possible to transmit the signaling portion of a call via a dedicated data link borrowing a few bits of the corresponding voice channel. In the mid-1970s, to reduce the demands on switch processing power and trunk usage, the telecom industry adapted a common signaling standard. The first standard used was called "Common Channel Interoffice Signaling Systems #6" (CCIOS6). CCS6 had features for exchanging call set-up and routing information between switches. More Features In the late 70s and 80s extensive effort was invested in enhancing the functionality of the common signaling standard with features that would soon bring increased revenues for service providers. By including features for queuing databases the platform for toll-free phone services (such as 800 numbers in the US) and collect or credit calls was established. A new standard, Signaling System #7 (SS7), was issued by International Telegraph & Telephone Consultative Committee (CCITT) in 1980. Most of the worlds telecom services use out-of-band signaling. Nearly all have adapted the SS7 standard.

SCCP provides connectionless and connection-oriented network services above MTP Level 3. While MTP Level 3 provides point codes to allow messages to be addressed to specific signaling points, SCCP provides subsystem numbers to allow messages to be addressed to specific applications (called subsystems) at these signaling points. SCCP is used as the transport layer for TCAP-based services such as freephone (800/888), calling card, wireless roaming, and personal communications services (PCS).

Global Title Translation SCCP also provides the means by which an STP can perform global title translation (GTT), a procedure by which the destination signaling point and subsystem number (SSN) is determined from digits (i.e., the global title) present in the signaling message. The global title digits may be the dialed 800/888 number, calling card number, or mobile subscriber identification number depending on the service requested. Because an STP provides global title translation, originating signaling points do not need to know the destination point code or subsystem number of the associated service. Only the STPs need to maintain a database of destination point codes and subsystem numbers associated with specific services and possible destinations.

Message Format SCCP messages are contained within the signaling information field (SIF) of an MSU. The SIF contains the routing label followed by the SCCP message contents. The SCCP message is comprised of a one-octet message type field followed by the mandatory fixed part (mandatory fixed-length parameters), mandatory variable part (mandatory variable-length parameters), and the optional part. Each optional part parameter is identified by a one-octet parameter code followed by a length indicator ("octets to follow") field. Psend kept free because of these great sponsors.a..

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