1.5.1 Line Device Identifier

A Line Device Identifier (LDID) is a unique logical number assigned to a specific resource (for example, a time slot) or a group of resources within a process by the Global Call library. Minimally, the LDID number will represent a network resource. For example, both a network resource and a voice resource are needed to process an R2 MFC dialing function. Using Global Call, a single LDID number is used by the application (or thread) to represent this combination of resources for call control.

An LDID number is assigned to represent a physical device(s) or logical device(s) that will handle a call, such as a network interface resource, when the gc_OpenEx( ) function is called. This identification number assignment remains valid until the gc_Close( ) function is called to close the line device.

When an event arrives, the application (or thread) can retrieve the LDID number associated with the event by using the linedev field of the METAEVENT structure. The LDID is retrieved using the gc_GetMetaEvent( ) function.The LDID is retrieved using the gc_GetMetaEvent( ) or the gc_GetMetaEventEx( ) function.

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