ISDN : Integrated Service Digital Network
IMT : 2000 International Mobile Telecommunications - 2000
VoIP : Voice over IP
PBX : Private Branched Exchange
MMI : Man-Machine Interface
GUI : Graphic User Interface
LM : Layer Manager
SM : Stack Manager
SGW : Signaling GateWay
MG : Media Gateway
3GPP : rd Generation Partnership Project
3GPP2 : 3rd Generation Partnership Project 2
SW : SoftWare
MTP : Message Transfer Part
ISUP : ISDN User Part
SIGRAN : Signaling Transport
ACK : Acknowledgement
SACK : Selective Acknowledgement
MAC : Message Authentication Code
RTO : Retransmission Time-out
RTT : Round-trip Time
RTTVAR : Round-trip Time Variation
SRTT : Smoothed RTT
TCB : Transmission Control Block
TLV : Type-Length-Value Coding Format
TSN : Transmission Sequence Number
DPC : Destination Point Code
MTP : Message Transfer Part

OPC : Origination Point Code
SLS : Signaling Link Selection
L2INF : Layer2 Interface control Block
SIO : Service Information Octet
SAP : Service Access Point
IWF : Inter-Working Function Block
BSNT : Backward Sequence Number Transmission
FSNT : Forward Sequence Number Transmission
L2 : Layer 2
SCCP : Service Connection Control Protocol
ISUP : ISDN User Part
TCAP : Transaction Control Application Protocol
CIC : Circuit Identification Code
SSN : SubSystem Number
ASP : Application Service Point
AS : Application Server
M3UA : MTP3 User Adaptation
SCTP : Signaling Control Transmission Protocol
IP : Internet Protocol
TCP : Transmission Control Protocol
PSTN : Public Switched Telephony Network
SG : Signaling Gateway
MGC : Media Gateway Controller
SS7 : Signaling System Number 7
SGP : Signalling Gateway Process
IPSP : IP Server Process
ASPSM : ASP State Maintenance
ASPTM : ASP Traffic Maintenance
SSNM : SS7 Signalling Network Management
DUNA : Destination Unavailable
DAVA : Destination Availabel

DAUD : Destination Audit
DUPU : Destination User Part Unavailable
SCON : Signalling Congestion
RK : Routing Key
RC : Routing Context
SPMC : Signalling Point Management Cluster
STLM : Signaling Link Test Message

3GP2 : 3rd Generation Partnership Project 2
3GPP : 3rd Generation Partnership Project
AAL : ATM Adaptation Layer
ALG : Application Level Gateway
API : Application Program Interface
APN : Access Point Name
AS : Application Server
ASE : Application Service Element
ASP : Application Server Process
ATC : AAL Type Conversion module
ATM : Asymmetric Transfer Method
AUTN : AUthentication TokeN
AVP : Attribute-Value Pair
B2BUA : Back-to-Back User Agent
BGA : Ball Grid Array
BGCF : Breakout Gateway Control Function
BGP : Border Gateway Protocol
CCF : Charging Collection Function
CDR : Charging Data Record
CEA : Capability Exchange Answer
CER : Capability Exchange Request
CGF : Charging Gateway Function
CIP : Composite Internet Protocol
CLI : Call Level Interface
CMIP : Common Management Information Protocol
CN : Core Network
COA : Card of Address
CRTP : Compressed Real-Time Protocol
CS : Circuit Switched
CSCF : Call Session Control Function
CSI : Customer Service center Interface
DBA : Data Base Agent
DBS : Data Base Subsystem
DHCP : Dynamic Host Configuration Protocol
DNS : Domain Name System(Server)
DSTM : Dual Stack Transition Mechanism
DTD : Document Type Definition
ECF : Event Charging Function
EGP : Exterior Gateway Protocol
FP : Frame Protocol
G-CDR : GGSN-Charging Data Record
GCID : GPRS Charging Identifier
GGSN : Gateway GPRS Support Node
GMLC : Gateway Mobile Location Center
GMSC : Gateway MSC
GPRS : General Packet Radio Service
GRE : Generic Rout ing Encapsulation
GSN : GPRS Support Nodes
GTP : GPRS Tunnelling Protocol
GTP-C : GPRS Tunnelling Protocol for Control Plane
GTP-U : GPRS Tunnelling Protocol for User Plane
GUI : Graphical User Interface
HDHB : HSS Diameter Handling Block
HEC : Header Error Control
HLR : Home Location Register
HSS : Home Subscriber Server
ICID : IM CN subsystem Charging Identifier

I-CSCF : Interrogating CSCF
IETF : Internet Engineering Task Force
IGP : Interior Gateway Protocol
IM : IP Multimedia
IMOAH : IP Multimedia Operator Access Handler
IMS : IP Multimedia core network Subsystem
IMSI : International Mobile Subscriber Identity
I0I : Inter Operator Identifier
IP : Internet Protocol
IPC : Inter Process Communication
IPHC : Internet Protocol Header Compression
IPoA : IP over ATM
IPsec : IP Security Protocol
IPv4 : Internet Protocol version 4
IPv6 : Internet Protocol version 6
ISC : IP multimedia Subsystem Service Control
ISIM : IMS Subscriber Identity Module
L2TP : Layer 2 Tunneling Protocol
LAC : L2TP Access Concentrator
LAS : Legacy Application Subsystem
LIA : Location Information Answer
LIPE : Lightweight Internet Protocol Encapsulation
LIR : Location Information Request
LNS : L2TP Network Server
M3UA : MTP Layer 3 User Agent
MAA : Multimedia Authentication Answer
MAC : Message Authentication Code
MAP Mobile Application Part
MAR Multimedia Authentication Request
MAS Multimedia Application Subsystem

MCC : Mobile Country Code
M-CDR : Mobility-Charging Data Record
MDP : Multimedia Data Packet
MGCF : Media Gateway Control Function
MGW : Media Gateway
MH : Multiplexed Header
MM : Mobility Management
MMSE : Multimedia Service Element
MNC : Mobile Network Code
MPHB : MAP Protocol Handling Block
MPLS : Multi-Protocol Label Switching
MRFC : Multimedia Resource Function Controller
MRFP : Multimedia Resource Function Processor
MSC : Mobile Services Switching Center
MTP : Message Transfer Part
NAI : Network Access Identifier
NAT-PT : Network Address Translation-Protocol Translation
OAH : Operator Access Handler
ODBC : Open Database Connectivity
OMS : Operation & Maintenance Subsystem
P-CSCF : Proxy CSCF
PDP : Packet Data Protocol
PDU : Protocol Data Unit
PHCB : Packet Handover Control Block
PLMN : Public Land Mobile Network
PMMB : Packet Mobility Management Block
PPA : Push Profile Answer
PPP : Point-to-Point Protocol
PPR : Push Profile Request
PPTP : Point-to-Point Tunneling Protocol

PS : Packet Switched or Peer Server
PSP : Peer Signaling Process
PSTN : Public Switched Telephone Network
RA : Rout ing Area
RAN : Radio Access Network
RAND : RANDom challenge
RES : RESponse
RFC : Requests for Comments
RIP : Routing Information Protocol
RNC : Radio Network Controller
RNS : Radio Network Subsystem
RPHB : RANAP Protocol Handling Block
R-SGW : Roaming Signaling Gateway
RTA : Registration Termination Answer
RTCP : Real-time Transport Control Protocol
RTE : Route Table Entry
RTP : Real-time Transport Protocol
RTR : Registration Termination Request
S7SM : SS7 Stack Manager
SAA : Server Assignment Answer
SAAL : Signaling ATM Adaptation Part
SAP : Service Access Point
SAR : Server Assignment Request
SCCP : Signaling Connection Control Part
S-CDR : Session-Charging Data Record
SCGB : SGSN Charging Gathering Block
SCP : Service Control Point
S-CSCF : Serving C53CF
SCTP : Stream Control Transmission Protocol
SDHB : SGSN Data Handling Block

SDMB : SGSN Data Management Block
SDP : Session Descript ion Protocol
SGHB : SGSN GTP Handling Block
SGSN : Serving GPRS Support Node
SIP : Session Initiation Protocol
SLA : Sit-Level Aggregation
SLF : Subscription Locator Function
SMS : Short Message Service
SQN : SeQuence Number
SSMB : SGSN Session Management Block
STLM : SigTran Layer Manager
STP : Signaling Transfer Point
TCAP : Transaction Capability Application Part
TCP : Transmission Control Protocol
TMM : Transmission Management Module
TPS : Transport Protocol Subsystem
TSN : Transmission Sequence Number
UA : User Agent
UAA : User Authentication Answer
UAC : User Agent Client
UAR : User Authentication Request
UAS : User Agent Server
UDP : User Datagram Protocol
UE : User Equipment
UMTS : Universal Mobile Telecommunications System
URI : Universal Resource Identifier
URL : Universal Resource Locator
UTRAN : Universal Terrestrial Radio Access Network
VCI/VPI : Virtual Channel Indentifier/Virtual Path Identifier

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