Polycom MGC Administrator, Руководство администратора

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Chapter 7 - Configuring the Gateway
7-6
Calling Methods Using a Single Gateway
The GW-25/GW-45 gateway configuration supports H.323-to-H.320, H.320-
to-H.323 and H.323-to-H.323 point-to-point calls. When an endpoint calls
another endpoint, the dial-in number depends on the network used by the call
initiator and on the method used to route the call. The Routing Method
depends on the gateway configuration.
H.320 to H.323 Calls
A H.320 - H.323 gateway provides inter-working by providing the conversion
of audio, video, data and control protocols as specified in the H.323 and
H.320 system specifications.
When the H.320 endpoint calls the H.323 endpoint, three different methods
may be used to reach the same endpoint: Destinations, Address Book and
Forwarding Service.
Destinations
In the Destinations method, the carrier allocates the dial-in numbers to the
MCU/Gateway. Usually the carrier only transfers part of the number (the last
digits from the end of the number) to the gateway for example, 1501 to 1600.
Each dial-in number is assigned to a specific destination H.323 endpoint. The
destination H.323 endpoints will have to be configured according to the dial-
in numbers allocated to the gateway using aliases in E.164 format. For
example, if the dial-in number 1501 is allocated to an H.323 endpoint, the
endpoint alias will have to be configured as 1501 in E.164 format. Each of the
H.323 endpoints must register with the gatekeeper using its E.164 alias.