Polycom MGC Administrator, Administrator'S Manual

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Chapter 7 - Configuring the Gateway
7-22
Calling Methods Using the Double Gateway
The Double Gateway can perform six basic call directions:
• H.320 Endpoint over H.323 Backbone to H.323 Endpoint
•
H.323 Endpoint over H.323 Backbone to H.320 Endpoint
•
H.320 Endpoint over H.323 Backbone to H.320 Endpoint
• H.323 Endpoint over H.323 Backbone to H.323 Endpoint
• H.323 Endpoint over H.320 Backbone to H.323 Endpoint
With an H.320 backbone you cannot initiate a double gateway call from an
ISDN endpoint, since a single gateway does not support an H.320 to H.323
call.
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 way the gateways are configured. In a
Double Gateway communications setup, the Remote Gateway Definition and
Gateway Link require configuration according to the Routing Method that is
to be implemented.
H.323 to H.323 to H.320/H.323 Calls
When a H.323 endpoint calls an endpoint (H.323 or 320), two different
methods may be used to reach the same endpoint: Profile or Address Book.
H.323 Endpoint Over an H.323 Backbone to H.320 Endpoint,
Using Profiles
In this method, the endpoint number and the gateway session configuration
details are transferred to the gateway in the dialed number.
The H.323 endpoint connects using the following string: [ local GW prefix ,
first GW Link ID ] * [ ISDN No. ], for example, 7011*1234.
Gateway Configuration - General Settings
When using the double gateway you are required to use the same settings for
both the local and remote gateway.
It is strongly recommended that default settings are used for the Speed dial
indicator (Address Book indicator) and the Multiple-number Delimiter (Profile
indicator).