4.9.1. Nonstandard UII Message (H.245)

Use the gc_Extension( ) function in asynchronous mode with an ext_ id (extension ID) of IPEXTID_SENDMSG to send nonstandard UII messages. The target_type should be GCTGT_GCLIB_CRN and the target_id should be the actual CRN. At the sending end, a GCEV_EXTENSIONCMPLT event is received indicating that the message has been sent. At the receiving end, a GCEV_EXTENSION event with the same ext_id value is generated. The extevtdatap field in the METAEVENT structure for the GCEV_EXTENSION event is a pointer to an EXTENSIONEVTBLK structure which in turn contains a GC_PARM_BLK that includes all of the data in the message.

The relevant parameter set IDs and parameter IDs for this purpose are:

• IPSET_MSG_H245
  • IPPARM_MSGTYPE - Set to IP_MSGTYPE_H245_INDICATION.
• IPSET_NONSTANDARDDATA
  • Either
  • IPPARM_NONSTANDARDDATA_DATA - Actual nonstandard data. The maximum length is MAX_NS_PARM_DATA_LENGTH (128).
  • IPPARM_NONSTANDARDDATA_OBJID - Object ID string. The maximum length is MAX_NS_PARM_OBJID_LENGTH (40).
  • or
  • IPPARM_NONSTANDARDDATA_DATA - Actual nonstandard data. The maximum length is MAX_NS_PARM_DATA_LENGTH (128).
  • IPPARM_H221NONSTANDARD - H.221 nonstandard data identifier.

Note: The message type (IPPARM_MSGTYPE) is mandatory. At least one other information element must be included.

See Section 6.12, IPSET_MSG_Q931 Parameter Set and Section 6.14, IPSET_NONSTANDARDDATA Parameter Set for more information.

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/* H245 UII with ObjId and data */

rc = gc_util_insert_parm_val(&t_PrmBlkp, IPSET_MSG_H245, IPPARM_MSGTYPE,
                             sizeof(int), IP_MSGTYPE_H245_INDICATION);

rc = gc_util_insert_parm_ref(&t_PrmBlkp, IPSET_NONSTANDARDDATA,
                             IPPARM_NONSTANDARDDATA_OBJID, ObjLen+1, ObjId);

rc = gc_util_insert_parm_ref(&t_PrmBlkp, IPSET_NONSTANDARDDATA,
                             IPPARM_NONSTANDARDDATA_DATA, DataLen+1, data);

if (rc == -1) {
    printf("Fail to insert parm");
    return -1; }
else
    printf("Sending IP H245 UII Message");

gc_Extension(GCTGT_GCLIB_CRN, 
             crn, 
             IPEXTID_SENDMSG, 
             t_PrmBlkp, 
             &t_RetBlkp,
             EV_ASYNC);

gc_util_delete_parm(t_PrmBlkp);
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