2.2.2. IPT Network Devices

Global Call supports three types of IPT network devices:

• H.323 only (P_H323 in the devicename string when opening the device)
• SIP only (P_SIP in the devicename string when opening the device)
• Dual protocol, H.323 and SIP (P_IP in the devicename string when opening the device)

The device type is determined when using the gc_OpenEx( ) function to open the device. H.323 and SIP only devices are capable of initiating and receiving calls of the selected protocol type only.

Dual protocol devices are capable of initiating and receiving calls using either the H.323 or SIP protocol. The protocol used by a call on a dual protocol device is determined during call setup as follows:

• For outbound calls, by a parameter to the gc_MakeCall( ) function.
• For inbound calls, by calling gc_GetCallInfo( ) to retrieve the protocol type used. In this case, the application can query the protocol type of the current call after the call is established, that is, as soon as either GCEV_DETECTED (if enabled) or GCEV_OFFERED is received.

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