3.3.1 Call State Configuration

Some states in the basic call model are optional and can be enabled or disabled selectively. Every technology or call control library has a default call state model consisting of all the states it can possibly support from the basic call model. If a state is disabled, the corresponding call state event will also be disabled. If a state is enabled, the event mask setting still determines which call state events are sent to the application.

This configuration can be done by issuing the gc_SetConfigData( ) function with a target_type of GCTGT_GCLIB_CHAN and a target_ID of a line device, and passing the appropriate set ID and parm IDs. The set ID used in this context is GCSET_CALLSTATE_MSK and the relevant parm IDs are:

GCACT_ADDMSK

Enable the call states specified in the value in addition to other states already enabled.

GCACT_SUBMSK

Disable all the call states specified in the value.

GCACT_SETMSK

Enable the call states specified in the value and disable other optional states that are already enabled.

The GCACT_ADDMSK, GCACT_SUBMSK and GCACT_SETMSK parm IDs can be assigned one of the following values (of type GC_VALUE_LONG), or an ORed combination of the values:

• GCMSK_ALERTING_STATE
• GCMSK_CALLROUTING_STATE
• GCMSK_DETECTED_STATE
• GCMSK_GETMOREINFO_STATE
• GCMSK_PROCEEDING_STATE
• GCMSK_SENDMOREINFO_STATE

See the Global Call API Library Reference for more information on the gc_SetConfigData( ) function.

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