Amer-networks E5Web GUI Bedienungsanleitung PDF herunterladen (Seite 423)

100

101

Action Src Interface Src Network Dest Interface Dest Network

OutboundToProxy Allow lan lan_net dmz ip_proxy

OutboundFromProxy Allow dmz ip_proxy lan lan_net

InboundFromProxy Allow dmz ip_proxy core dmz_ip

InboundToProxy Allow wan all-nets dmz ip_proxy

With Record-Route disabled, the following IP rules must be added to those above:

Action Src Interface Src Network Dest Interface Dest Network

OutboundBypassProxy Allow lan lan_net wan all-nets

InboundBypassProxy Allow wan all-nets lan lan_net

6.2.9. The H.323 ALG

H.323 is a standard approved by the International Telecommunication Union (ITU) to allow

compatibility in video conference transmissions over IP networks. It is used for real-time audio,

video and data communication over packet-based networks such as the Internet. It specifies the

components, protocols and procedures for providing such multimedia communication,

including Internet phone and voice-over-IP (VoIP). (For VoIP see also Section 6.2.8, “The SIP ALG”.)

H.323 Components

H.323 consists of four main components:

Terminals Devices used for audio and optionally video or data

communication, such as phones, conferencing units, or

"software phones" such as the product "NetMeeting".

Gateways An H.323 gateway connects two dissimilar networks and

translates traffic between them. It provides connectivity

between H.323 networks and non-H.323 networks such as

public switched telephone networks (PSTN), translating

protocols and converting media streams. A gateway is not

required for communication between two H.323 terminals.

Gatekeepers The Gatekeeper is a component in the H.323 system which

is used for addressing, authorization and authentication of

terminals and gateways. It can also take care of bandwidth

management, accounting, billing and charging. The

gatekeeper may allow calls to be placed directly between

endpoints, or it may route the call signalling through itself

to perform functions such as follow-me/find-me, forward

on busy, etc. It is needed when there is more then one

H.323 terminal behind a NATing device with only one

public IP.

Multipoint Control Units MCUs provide support for conferences of three or more

H.323 terminals. All H.323 terminals participating in the

conference call have to establish a connection with the

MCU. The MCU then manages the calls, resources, video

and audio codecs used in the call.

H.323 Protocols

Chapter 6: Security Mechanisms

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