Cisco Systems OL-8155-01 manual GL-7

Glossary

G

gateway

GRE

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.

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	Refers to the higher frequency levels in the VHF band, typically 138-222 MHz.
frequency
Hoot ‘n’ Holler	A communications system where the loudest and most recent talker or talkers are
(Hootie)	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.

	Cisco IPICS Server Installation Guide
OL-8155-01		GL-7