# nccRejectCall and specifying extended information

With certain CAS protocols, when an application attempts to reject a call with nccRejectCall, extended information can be sent with the call reject request. This information is included in the CAS_REJECT_EXT structure which is a component of the NCC_ADI_CAS_PARMS structure:

ttypedef struct
{
DWORD size; /* size of this structure */
WORD cause; /* reject cause */
WORD pad;
} CAS_REJECT_EXT;

In the function call, the NCC_ADI_CAS_PARMS structure is referenced using the void *protcallparms argument.

The CAS_REJECT_EXT structure contains the following fields:

Field | Protocols that use the field | Description
--- | --- | ---
size | All | Size of this structure.
cause | WNK, MFC | Reject cause. For MFC, this can be used to determine the Group B tone used to reject the call.