2.2. Device Types and Usage

When using Global Call with IP technology, three types of devices are used:

• IPT Board Device - A virtual entity that represents a NIC or NIC address (if one NIC supports more than one IP address). The format of the device name is iptBx, where x is the logical board number that corresponds to the NIC or NIC address. See Section 2.2.1, IPT Board Devices for more information.
• IPT Network Device - Represents a logical channel over which calls can be made. This device is used for call control (call setup and tear down). The format of the device name is iptBxTy, where x is the logical board number and y is the logical channel number. See Section 2.2.2, IPT Network Devices for more information.
• IP Media Device - Represents a media resource that is used to control RTP streaming, monitoring Quality of Service (QoS) and the sending and receiving of DTMF digits. The format of the device name is ipmBxCy, where x is the logical board number and y is the logical channel number.

The IPT network device (iptBxTy) and the IP Media device (ipmBxCy) can be opened simultaneously in the same gc_OpenEx( ) command. If a voice resource is available in the system, for example an IP board that provides voice resources or any other type of board that provides voice resources, a voice device can also be included in the same gc_OpenEx( ) call to provide voice capabilities on the logical channel. See Section 3.4.12, gc_OpenEx( ) for more information.

Alternatively, the IPT network device (iptBxTy) and the IP Media device (ipmBxCy) can be opened in separate gc_OpenEx( ) calls and subsequently attached using the gc_AttachResource( ) function.

The IP Media device handle, which is required for managing Quality of Service (QoS) alarms for example, can be retrieved using the gc_GetResourceH( ) function. See Section 4.10, Quality of Service Alarm Management for more information.

Figure 6 shows the relationship between the various types of Global Call devices when a single Host NIC is used.

Figure 6. Global Call Devices

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