ISDN_FACILITY.ISDN_REQ(D7isdn)

ISDN_FACILITY.ISDN_REQ -- ISDN optional facilities request

Synopsis

   #include <sys/stream.h>
   #include <sys/mdi.h>
   #include <sys/types.h>
   #include <sys/scoisdn.h>
   
   typedef struct isdn_facility_req
   {
       isdnCtrlr_t      ctlr;
       isdnFacility_t   selector;
       isdnFRP_t        frp;
   } isdn_facility_req_t;

Description

The ISDN_FACILITY.ISDN_REQ message consists of one M_PROTO(D7str) message block requests to handle optional facilities on the controller or facilities related on connections identified by the PLCI (Physical Link Connection Identifier) or the NCCI (Network Control Connection Identifier). The frp parameter is defined for each facility; as of this writing, two facilities are defined:

Handset Support: used to support external ISDN equipment
DTMF (Dual Tone Multi Frequency): used in the PSTN (Public Switched Telephone Network) to select and control several services provided (such as automatic answering service).

Handset and DTMF support are optional ISDN driver features. If the ISDN driver does not support these facilities, an appropriate info value is returned in the ISDN_FACILITY.ISDN_CONF(D7isdn).

DTMF cannot be used with all B protocols. It is normally used with 64Kbit/sec bit speech and T.30 audio.

Parameters

ctlr: Controller/PLCI/NCCI.
selector: Facility selector; see isdnFacility(D4isdn).
frp: Facility request parameter; see isdnFRP(D4isdn).

References

Intro(D4isdn), Intro(D7isdn)

ISDN_FACILITY.ISDN_CONF(D7isdn), ISDN_FACILITY.ISDN_IND(D7isdn), ISDN_FACILITY.ISDN_RESP(D7isdn)

``SCO ISDN adapter drivers'' in Developing MDI network adapter drivers