This is a union of all the possible request primitives. There is one variant of the union for each possible request.
typedef union { struct _call_setup_request_st { size_t sizetLength ; SL_CALL_REF slCallReference ; int pause ; int ring_wait ; int ring_time ; int iChannelNo ; int iVpackNo ; int ifdBearerChannel ; BOOL ChannelGroupSet[SL_MAX_CHANNEL_GROUP] ; char phone_num[SL_PHONE_NUM_LEN] ; SL_APPL_INFO_ST slApplInfo ; } call_setup_request_st ;
and so on:
struct _call_answer_request_st { size_t sizetLength ; SL_CALL_REF slCallReference ; int iChannelNo ; int iVpackNo ; SL_APPL_INFO_ST slApplInfo ; } call_answer_request_st ; ... } call_transfer_request_st ; ... } call_terminate_request_st ; ... } SL_REQUEST_PARM_ST, *SL_REQUEST_PARM_SP ; typedef SL_REQUEST_PARM_ST * PSL_REQUEST_PARM_ST ;
The individual fields of this data structure are defined under the corresponding primitive definitions in Signaling interface primitives.