European Telecommunications Standards Institute Internet Protocol Harmonization over Networks
G
GK
gatekeeper
GKRCS
gatekeeper-routed call signaling
GKTMP
GateKeeper Transaction Message Protocol—a Cisco-proprietary protocol that allows third-party applications to influence the operation of the IOS GK
GW
gateway
H
HSRP
Hot Standby Router Protocol—used to ensure GK fault tolerance
I
IMT
intermachine trunk
IPM
Cisco's Internetwork Performance Monitor
ISP
Internet service provider
ITSP
Internet telephony service provider
IVR
interactive voice response
IXC
interexchange carrier—a regulated U.S. Class 4 carrier that is often a wholesale customer
L
LEC
local exchange carrier
LCR
least-cost routing
M
MGCP
Media Gateway Control Protocol
MIB
management information base
N
NI-2
National ISDN version 2—a BRI circuit
NMS
network management system
NOA
nature of address
O
OLO
other licensed operator
OSP
Open Settlements Protocol
OSS
operations support system
OPT
Open Packet Telephony
P
PDF
portable document format
PIN
personal identification number
POP
point of presence
PSTN
Public switched telephone network
PTT
Post, Telephone, Telegraph—a government-mandated or -operated national telephony carrier
Q
QoS
quality of service
R
R2
A type of CAS used widely in places other than North America
RADIUS
Remote-Authentication Dial-In User Service
RAI
resource availability indicator
RAS
H.225 Registration, Admission, and Status Protocol—spoken between H.323 gateways and their gatekeepers
RLM
redundant link manager
RRQ
registration request
RTP
Realtime Transport Protocol
RTSP
Real-Time Streaming Protocol— for controlling the streaming of RTP packets from a storage source
S
SC
signaling controller—a Cisco SC2200 signaling gateway that converts SS7 to a backhauled NI-2 protocol to gateways
SGCP
Simple Gateway Control Protocol
SLT
signaling link termination—a Cisco 2611 machine capable of terminating SS7 at the MTP2 layer and backhauling MTP3 (and up) to the SC2200 or virtual switch controller (VSC)
SNMP
Simple Network Management Protocol
SS7
Signaling System 7
SSL
secure socket layer
T
TAC
Technical Assistance Center
TCL
Tool Command Language
TDM
time division multiplex
TFTP
Trivial File-Transfer Protocol
U
URL
uniform resource locator
UDP
User Datagram Protocol
URQ
unregistration Request
V
VSA
vendor-specific attribute—a nonstandard attribute tag used by RADIUS. Cisco has defined many useful VSAs to enhance the gateway CDR format.
VSC
virtual switch controller—one of various Cisco machines capable of providing SS7 signaling conversion, and able to control gateways by means of MGCP
