| 3GPP |
Third Generation Partnership Project |
| ACD |
Automatic Call Distribution |
| AF |
Application Function |
| AIN |
Advanced Intelligent Network |
| ANSI |
American National Standards Institute |
| BGF |
Border Gateway Function |
BRI |
Basic Rate Interface |
| CAMEL |
Customized Applications for Mobile Networks Enhanced Logic |
| CSCF |
Call Session Control Function |
| ETSI |
European Telecommunications Standards Institute |
GPRS |
General Packet Radio Service |
GSM |
Global System for Mobile |
| HSS |
Home Subscriber Server |
| Ia |
Interface Ia |
| IETF |
Internet Engineering Task Force |
| IMS |
IP Multimedia Subsystem |
| IM-SSF |
IP Multimedia Services Switching Function |
ISDN |
Integrated Services Digital Network |
ISUP |
ISDN User Part |
MEGACO |
Media Gateway Control |
MG |
Media Gateway |
MGC |
Media Gateway Controller |
MGCP |
Media Gateway Control Protocol |
MS |
Mobile Station |
MTP |
Message Transfer Part |
| NAPT |
Network Address and Port Translation |
| NASS |
Network Attachment Sub-System |
| NAT |
Network Address Translation |
NI-1 |
National ISDN-1 |
NI-2 |
National ISDN-2 |
NNI |
Network to Network Interface |
OSS |
Operation Services System |
PBX |
Private Branch Exchange |
PCS |
Personal Communication Services |
PIN |
Personal Identification Number |
PLMN |
Public Land Mobile Network |
PRI |
Primary Rate Interface |
PSDN |
Packet Switch Data Network |
PSTN |
Public Switch Telephone Network |
| RACS |
Resource and Admission Control Subsystem |
SCCP |
Signaling Connection Control Part or Skinny Client Control Protocol (Cisco) |
SCTP |
Stream Control Transmission Protocol |
| SDP |
Session Description Protocol |
SG |
Signaling Gateway |
SIGTRAN |
IETF Signaling Transport working group |
SIM |
Subscriber Identity Module |
SIP |
Session Initiation Protocol |
| SIP-ISC |
SIP IP Multimedia Service Control |
SMSC |
Short Message Service Center |
| SDPF |
Service-based Policy Decision Function |
SOC |
System Operator Code |
SS7 |
Signaling System number 7 |
STP |
Signaling Transfer Point |
TCAP |
Transaction Capability Part |
TCP |
Transmission Control Protocol |
| UA |
User Agent (SIP) or User Adaptation Layer (SIGTRAN) |
| UDP |
User Datagram Protocol |
UIM |
User Identity Module |
UMTS |
Universal Mobile Telecommunications System |
| UNI |
User-to-Network Interface |
USIM |
Universal Subscriber Identity Module |
VLR |
Visitor Location Register |
VMS |
Voice Mail System |
W-CDMA |
Wide band Code Division Multiplex Access |
