Glossary of SS7 Acronyms


ARP Address Resolution Protocol (RFC 826)
ASE Application Service Element
BIB Backward Indicator Bit
BICC Bearer Independent Call Control
BSN Backward Sequence Number
CCS Common Channel Signaling
CIC Circuit Identification Code
DPC Destination Point Code
DUP Data User Part
FCS Frame Check Sequence
FIB Forward Indicator Bit
FSN Forward Sequence Number
FISU Fill-In Signal Unit
GTT Global Title Translation
ICMP Internet Control Message Protocol (RFC 792)
IP Internet Protocol (RFC 753, RFC 759, RFC 766, RFC 774, RFC 791...)
ISP Intermediate Service Part
ISPC International Signaling Point Code
ISUP ISDN User Part
LI Length Indicator
LSSU Link Status Signal Unit
M2PA MTP2 Peer-to-Peer Adapter (IETF draft v6)
M3UA MTP3 User Adapter (RFC 3332)
MAC Media Access Control
MSU Message Signal Unit
MTP Message Transfer Part
MTP3 SS7 Message Transport Part Level 3 (GR-246-CORE)
NSP Network Services Part
OMAP Operations and Maintenance Application Part
ITU International Telecommunication Union
OPC Origination Point Code
OSI Open Systems Interconnection
SAAL Signaling ATM Adaptation Layer
SANC Signaling Area Network Code
SCCP Signaling Connection Control Part
SCTP Stream Control Transport Protocol (RFC 2960, RFC 3309...)
SEP Signaling End Point
SF Status Field
SI Service Indicator
SIF Signaling Information
SIGTRAN Signal Transport
SIO Service Information Octet
SLC Signal Link Code
SLS Signal Link Selection
SNM Signaling Network Management
SNT Signaling Network Testing
SP Signaling Point
SPC Signaling Point Code
SPR Signaling Point W/SCCP Relay function
SSF Sub-Service Field
STP Signal Transfer Point
SU Signal Units
SUA SCCP User Adapter (IETF draft v3)
TALI Transport Adapter Layer Interface (RFC 3094)
TC Transaction Capabilities
TCAP Transaction Capabilities Application Part
TCP Transmission Control Protocol (RFC 675, RFC 793, RFC1347...)
TUP Telephone User Part