Page 252 of 258 List of terms
provided by ESA. Please note, however, that the ESA feature is also generally useful for users who are not subject to legislation, and is broad enough to be used in different countries. For example, it will be appreciated by any customer who wants to route emergency calls in a special manner, or who wants to be notified when a telephone user makes an emergency call. It would also appeal to a customer who wishes to have ESA calls answered onsite,
on the business premises, rather than being forwarded to the Public Services Answering Point (PSAP). Refer to Emergency Services Access: Description and Administration
Gatekeeper
The Gatekeeper is a separate application on an IP network that directs IP traffic to all the systems on the network. Parameters for both the main office and SRG must be assigned to all gatekeepers active on the network. If the Gatekeeper is down, the SRG attempts to connect to the Alternate Gatekeeper, if there is one. If the Alternate Gatekeeper is down as well, or there is no Alternate Gatekeeper, the SRG IP Phones remain registered with the main office but calls cannot be sent to the SRG.
gateway
In networking, a combination of hardware and software that links two different types of networks. Gateways between
H.323
A standard approved by the International Telecommunication Union (ITU) that defines how audiovisual conferences data is transmitted across networks. In theory, H.323 enables users to participate in the same conference even though they are using different video conferencing applications. Although most video conferencing vendors have announced that their products conform to H.323, it is too early to say whether such adherence actually results in interoperability.
IP
Abbreviation of Internet Protocol, pronounced as two separate letters. IP specifies the format of packets, also called datagrams, and the addressing scheme. Most networks combine IP with a
