2.2.1. IPT Board Devices

An IPT board device is a virtual entity that corresponds to a NIC or NIC address and is capable of handling both H.323 and SIP protocols. The application uses the gc_Start( ) function to bind NIC IP addresses to IPT virtual board devices. Possible configurations are shown in Figure 7. The operating system must support the IP address and underlying layers before the Global Call application can take advantage of the configurations shown in Figure 7. Up to eight virtual IPT boards can be configured in one system. For each virtual IPT board, it is possible to configure the local address and signaling port (H.323 and SIP), the number of IPT network devices that can be opened simultaneously, etc. See Section 3.4.19, gc_Start( ) for more information on how to configure IPT board devices.

Figure 7. Configurations for Binding IPT Boards to NIC IP Addresses

Once the IPT board devices are configured, the application can open line devices with the appropriate IPT network device (ipt channel) and optionally IPT media device (ipm channel).

The gc_SetConfigData( ) function can be used on an IPT board device to apply parameters to all IPT channels associated with the IPT board device. The application can use the gc_AttachResource( ) and gc_Detach( ) functions to load balance which host NIC makes a call for a particular IPT media device (ipm channel). It is also possible that the operating system can perform load balancing using the appropriate NIC for call control as shown in Figure 7, configuration D.

The gc_ReqService( ) function is used on an IPT board device for registration with an H.323 gatekeeper or SIP registrar. See Section 3.4.14, gc_ReqService( ) for more information.

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