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Glossary

Telecoms terms and abbreviations can be a little confusing, even for the most experienced engineers. Here’s a short glossary of some of the terms we use.

S

SCCP
Signalling Connection Control Part
This allows non-circuit related signalling (such as TCAP) to be carried over SS7 routes.
SCE
Service Creation Environment
This allows the creation of services in an SS7 Intelligent Network environment.
SCP
Service Control Point (SS7)
Service Control Points contain centralized network databases for providing enhanced services. The SCP accepts queries from the Service Switching Point (SSP) and returns the requested information to the requester.
SDLC
Synchronous Data Link Control
SDSL
Symmetric Digital Subscriber Line
SEP
Signalling Endpoint
SF
Status Field
SI
Service Indicator
SIB
Service Independent Building Blocks
In the area of SS7 based Intelligent Networks this refers to the abstract representation of IN capabilities that allow IN services to be built.
SIF
Signalling Information Field
SIM
Subscriber Identity Module
In GSM networks a subscriber is associated with a mobile station via the means of a personal chip card.
SIO
Signalling Information Octet
SIO contains information on the identity of the user of an SS7 MTP message - eg. ISUP, TCAP
SIP
Session Initiation Protocol
SIP is an IETF initiative that provides an alternative to the H.323 standard for VoIP signalling.
SLC
Signalling Link Code
SMPP
Short Message Peer to Peer
This protocol allows communication into and between SMSC's. Often this protocol is provided as a means of providing third party SMS applications with single or bulk SMS delivery.
SMS
Short Message Service
A text message service that enables short messages of generally no more than 140-160 characters in length to be sent and transmitted from a cell phone. In a GSM network this service is enabled by the SS7 MAP Protocol.
SMSC
Short Message Service Centre
A node in the network that receives all mobile originated text messages, determines the current status of the recipient, forwards the message to the appropriate destination subscriber, or stores them for later transmission.
SMTP
Simple Mail Transfer Protocol
SNMP
Simple Network Management Protocol (IETF)
SS7
Signalling System #7
SS7 is a global standard for telecommunications defined by the International Telecommunication Union (ITU) Telecommunication Standardization Sector (ITU-T). It provides protocol signalling standards for both fixed and cellular networks allowing for circuit based telephony calls and transaction based services - i.e. delivery of SMS, Intelligent Network Services.
SSP
Service Switching Point
Service Switching Points are telephone switches interconnected by SS7 links. SSPs perform call processing on calls that originate, tandem, or terminate at that site. SSPs generate SS7 messages to transfer call-related information to other SSPs or to query an SCP for routing instructions.
STP
Signalling Transfer Point
Signal Transfer Points are switches that relay messages between network switches and databases. Their main function is to route SS7 messages to the correct outgoing signalling link, based on SS7 message address fields.