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Global Call API Library Reference — November 2007 543
Dialogic Corporation
basic capability information — IP_CAPABILITY
IP_CAPABILITY
basic capability information
typedef struct
{
int capability;
int type;
int direction;
int payload_type;
IP_CAPABILITY_UNION extra;
char rfu[0x10];
} IP_CAPABILITY;
Description
The IP_CAPABILITY data structure provides basic media capability information, including the
capability or codec identification and the direction. The IP_CAPABILITY structure is used as the
value of one or more parameter element in a GC_PARM_BLK structure when communicating
coder capabilities between endpoints.
Note: The IP_CAPABILITY data structure is not intended to provide all the flexibility of the H.245
terminal capability structure or SDP, but provides a first level of useful information in addition to
the capability or codec identifier.
Field Descriptions
The fields of the IP_CAPABILITY data structure are described as follows:
capability
The IP Media capability for this structure. Possible values are:
• GCCAP_AUDIO_g711Alaw64k
• GCCAP_AUDIO_g711Ulaw64k
• GCCAP_AUDIO_g7231_5_3k
• GCCAP_AUDIO_g7231_6_3k
• GCCAP_AUDIO_g726_16k
• GCCAP_AUDIO_g726_24k
• GCCAP_AUDIO_g726_32k
• GCCAP_AUDIO_g726_40k
• GCCAP_AUDIO_g729AnnexA
• GCCAP_AUDIO_g729AnnexAwAnnexB
• GCCAP_AUDIO_NO_AUDIO
• GCCAP_DATA_t38UDPFax
• GCCAP_dontCare
type
The category of capability specified in this structure. Indicates which member of the
IP_CAPABILITY_UNION union is being used in the extra field. Possible values are:
• GCCAPTYPE_AUDIO – Audio
• GCCAPTYPE_RDATA – Data
Note: Video is not supported in this data structure because video requires the use of the
3PCC operating mode, which does not support this structure.