Polycom MGC Administrator Administrator's Manual page 103

MGC Administrator's Guide
H.323
H.323 is a standard for audio, video, and data communications across
IP-based (LAN) networks, including the Internet.
The H.323 network includes four main components: H.323 endpoints,
gateway, gatekeeper, and MCU with an IP card. The gateway and MCU may
be in one unit or two separate units.
The RAS (Registration Admission Status) signalling protocol is used to
communicate between endpoints and the gatekeeper.
H.323
Endpoint
Gatekeeper
RAS
RAS
ISDN
T1/E1
Spans
Gateway/MCU
H.320
IP
Endpoint
SIP Server SIP Endpoint
Figure 3-1: Typical H.323 Configuration
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