NEC Univerge sv8500 Manual page 971

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11.1 General

Media Gateway - Basic Rate Interface (MG-BRI) provides the Gateway function for ISDN network and IP net-

work and it is available to accommodate a maximum of two ISDN lines. MG-BRI also can connect one emer-

gency telephone line to be used in case MG function of the equipment is not available because of power failure

or IP network failure. In this case, emergency telephone will be automatically connected to the ISDN network

and will provide the communication path. The general structure of this equipment is shown in the diagram be-

Controlling Signal between MG-BRI and the Telephony Server is transmitted using Proprietary Protocol.

In this operation, PHI function embedded in the Telephony Server needs to be valid as registration desti-

nation for MG-BRI. This PHI function can be provided either by Internal PHI-BRI or SP-PHI, which you

can choose as registration destination. But even though MG-BRI is supposed to be registered to Internal

PHI-BRI, registration destination may switch to SP-PHI in some conditions. For the detail, refer to "Con-

sideration for SP-PHI Data Assignment" in Data Programming Manual - Business.

Internal PHI-BRI

PH to control this operation

B: Bearer (Voice or data 64 kbps)

D: Data (Call control 16 kbps)

Internal PHE

Telephony Server

Signaling Control Data

Analog Telephone

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