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GL-7
Cisco IPICS Server Installation Guide
OL-8155-01
Glossary
G
gateway
Device that performs an application-layer conversion of information from one
protocol stack to another. In Cisco IPICS, the gateway component includes LMR
gateways, which functionality is usually installed as an additional feature in a
supported Cisco router. LMR gateways provide voice interoperability between
radio and non-radio networks by bridging radio frequencies to IP multicast
streams.
GRE
generic routing encapsulation. Tunneling protocol that can encapsulate a wide
variety of protocol packet types inside IP tunnels, creating a virtual
point-to-point link to Cisco routers at remote points over an IP internetwork. By
connecting multiprotocol subnetworks in a single-protocol backbone
environment, IP tunneling that uses GRE allows network expansion across a
single-protocol backbone environment. GRE is generally used to route multicast
traffic between routers.
H
H.323
Defines a common set of codecs, call setup and negotiating procedures, and
basic data transport methods to allow dissimilar communication devices to
communicate with each other by using a standardized communication protocol.
high-band
frequency
Refers to the higher frequency levels in the VHF band, typically 138-222 MHz.
Hoot ‘n’ Holler
(Hootie)
A communications system where the loudest and most recent talker or talkers are
mixed into one multicast output stream. Also known as hootie, these networks
provide “always on” multiuser conferences without requiring that users dial in
to a conference.