4.5.1. Retrieving Nonstandard Data From Protocol Messages When Using H.323

Any Q.931 message can include nonstandard data. The application can use the gc_Extension( ) function with and ext_id of IPEXTID_GETINFO to retrieve the data while a call is in any state. The target_type should be GCTGT_GCLIB_CRN and the target_id should be the actual CRN. The information is included with the corresponding GCEV_EXTENSIONCMPLT termination event.

Note: When retrieving nonstandard data, it is only necessary to specify IPPARM_NONSTANDARDDATA_DATA in the extension request. It is not necessary to specify IPPARM_NONSTANDARDDATA_OBJID or IPPARM_H221NONSTANDARD. The call control library ensures that the GCEV_EXTENSIONCMPLT event includes the correct information.

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