Avaya IPO R9 IPSEC VPN TRIAL PLDS LIC 273967 사용자 설명서
제품 코드
273967
Product Description
IP Office 9.0
IP Office 9.0
© 2014 AVAYA All rights reserved.
Page 273
Issue 27.02.0 (Monday, January 06, 2014)
Gateways, Gatekeepers and H.323 - Technology Overview
IP Office uses the H.323 signaling protocol which has the following architectural components
·
Telephones are H.323 service endpoint devices that can support Audio calls. Other types of H.323
devices can support video as part of H.323
devices can support video as part of H.323
·
Gateways provide media translation to allow calls to be made to non-H.323 devices, for instance an
analog telephone or the public network to connect with a H.323 device
analog telephone or the public network to connect with a H.323 device
·
Gatekeepers control the call processing and security for H.323 devices
·
Multipoint Connection Units (MCU) for conferences by adding together media streams
These elements are grouped together in what is known as an H.323 zone (a zone is analogous to a PABX).
Each zone has a single Gatekeeper that can be considered as the brains of the system dealing with call
distribution, call control and the management of resources. On power-up, IP telephones, Gateways and MCU
make registration requests to a Gatekeeper which then authenticates (accepts or rejects) their request to
become a member of the zone. Once accepted, a telephone wishing to make a call sends a call set-up
message to the Gatekeeper which then determines how to route the call and will then send an alert to the
called telephone, or if the call is to a non-H.323 telephone establish the call via a Gateway within the zone.
Each zone has a single Gatekeeper that can be considered as the brains of the system dealing with call
distribution, call control and the management of resources. On power-up, IP telephones, Gateways and MCU
make registration requests to a Gatekeeper which then authenticates (accepts or rejects) their request to
become a member of the zone. Once accepted, a telephone wishing to make a call sends a call set-up
message to the Gatekeeper which then determines how to route the call and will then send an alert to the
called telephone, or if the call is to a non-H.323 telephone establish the call via a Gateway within the zone.
The design of IP Telephony systems has been driven by open standards. Digital IP telephones, Gateways and
Gatekeepers all support the H.323 standard and it is this that allows devices from different manufacturers to
work together. IP Office has an optional integral Gateway (Voice Compression Modules) and Gatekeeper
functionality required to provide a fully functional IP Telephony solution.
Gatekeepers all support the H.323 standard and it is this that allows devices from different manufacturers to
work together. IP Office has an optional integral Gateway (Voice Compression Modules) and Gatekeeper
functionality required to provide a fully functional IP Telephony solution.
SIP - Session Initiation Protocol
IP Office supports SIP, which is a signaling protocol used for creating session oriented connections between
two or more locations in an IP network. SIP trunking is a service offered by and ITSP (Internet Telephony
Service Provider) that permits businesses with an IP Office installed to use Voice-over-IP (VoIP) outside the
enterprise network by using the same connection as in Internet connection.
two or more locations in an IP network. SIP trunking is a service offered by and ITSP (Internet Telephony
Service Provider) that permits businesses with an IP Office installed to use Voice-over-IP (VoIP) outside the
enterprise network by using the same connection as in Internet connection.