Intel 05-2409-003 사용자 설명서

80

The following topics provide more information about using Global Call with Digital Network 
Interface boards that use the flexible routing configuration:

 

 

Digital Network Interface boards support three different types of voice devices:

E1 CAS compatible

T1 CAS compatible

ISDN compatible

The E1 CAS compatible is a superset of T1 CAS compatible, and the T1 CAS compatible is a 
superset of ISDN compatible. 

When using Global Call, only certain DM3 network interface devices can be associated with 
certain other DM3 voice devices using gc_OpenEx( ) or gc_AttachResource( ). Attaching DM3 
devices together depends on the network protocol used and voice device capabilities. Specifically:

A DM3 ISDN network device can be attached to any DM3 voice device.

A DM3 T1 CAS network device must be attached to a T1 CAS compatible DM3 voice device. 

A DM3 E1 CAS network device must be attached to an E1 CAS compatible DM3 voice 
device.

An application can query the capabilities of a device using the dx_getfeaturelist( ) function which 
includes information about the front end supported, meaning ISDN, TI CAS, or R2/MF. See the 
Voice API Library Reference for more information about the dx_getfeaturelist( ) function.

When using Global Call, if a voice device is not CAS or R2/MF capable, it cannot be attached 
(either in the gc_OpenEx( ) function or when using the gc_AttachResource( ) function) to a 
network interface device that has CAS or R2/MF loaded. Likewise, if a voice device is not routable, 
it cannot be used in a gc_AttachResource( ) call.

While a network interface protocol cannot be determined programmatically, the 
dx_getfeaturelist( ) function provides a programmatic way of determining voice capability so that 
the application can make decisions.