1.5. Configuration and Resource Association

Typically, in ISDN environments, calls do not require voice resources for ISDN signaling. However, voice resources may be used when the call is not end-to-end ISDN and in-band signaling information is to be collected.

Using Global Call ISDN products, applications can control Primary Rate line connectivity. The Global Call ISDN boards can be configured as terminating devices or installed in a variety of drop-and-insert configurations.

In a terminating configuration, incoming or outgoing calls on ISDN lines are processed by supported resource boards (such as voice boards). In a drop-and-insert configuration, incoming and outgoing calls (on individual channels) can either be processed by supported resource boards or passed on to additional network boards. Calls can also be both processed by supported resource boards and passed on to additional network boards, as well.

Global Call ISDN products can be placed in a variety of drop-and-insert configurations, providing all the features and benefits of terminate configurations, plus the ability to access an operator or another call. Drop-and-insert configurations allow calls to be passed from one network module (such as the DTI/240SC board) to another network module.

For each call, whether an inbound or an outbound call, the entity making the call is the "calling party" and the entity receiving the call is the "called party". For an inbound call, the calling party is eventually connected to a central office (CO) that connects to the Customer Premises Equipment (CPE) of the called party.

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