Global Call IP over Host-based Stack Technology User's Guide: 7.4. IP

7.4. IP_CAPABILITY

The IP_CAPABILITY data structure provides a level of capability information in addition to simply the capability or codec identifier.

Note: The IP_CAPABILITY data structure is not intended to provide all the flexibility of the H.245 terminal capability structure, but provides a first level of useful information in addition to the capability or codec identifier.

The data structure definition is as follows.
    typedef struct
    {
        int                     capability;
        int                     type;
        int                     direction;
        int                     payload_type;
        IP_CAPABILITY_UNION     extra;
        char                    rfu[0x10];
    } IP_CAPABILITY; 
Table 41 describes the meaning of each field in the IP_CAPABILITY data structure.

Table 41. IP_CAPABILITY Field Descriptions

Field

Description

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_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. Possible values are:

GCCAPTYPE_AUDIO - Audio
GCCAPTYPE_RDATA - Data

direction The capability direction code for this capability. Possible values are:

IP_CAP_DIR_LCLTRANSMIT - Indicates a transmit capability for the local endpoint.
IP_CAP_DIR_LCLRECIEVE - Indicates a receive capability for the local endpoint.
IP_CAP_DIR_LCLRXTX - Indicates a receive and transmit capability for the local endpoint. Supported for T.38 only.

payload_type The payload type. When using a standard payload type, set the value of this field to IP_USE_STANDARD_PAYLOADTYPE. When using a nonstandard payload type, use this field to specify the RTP payload type that will be used in conjunction with the coder specified in the capability field in this structure. Not currently supported.

extra The contents of the IP_CAPABILITY_UNION will be indicated by the type field.

rfu Reserved for future use. Must be set to zero when not used.

**Table 41. IP_CAPABILITY Field Descriptions**
Field	Description
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_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. Possible values are: GCCAPTYPE_AUDIO - Audio GCCAPTYPE_RDATA - Data
direction	The capability direction code for this capability. Possible values are: IP_CAP_DIR_LCLTRANSMIT - Indicates a transmit capability for the local endpoint. IP_CAP_DIR_LCLRECIEVE - Indicates a receive capability for the local endpoint. IP_CAP_DIR_LCLRXTX - Indicates a receive and transmit capability for the local endpoint. Supported for T.38 only.
payload_type	The payload type. When using a standard payload type, set the value of this field to IP_USE_STANDARD_PAYLOADTYPE. When using a nonstandard payload type, use this field to specify the RTP payload type that will be used in conjunction with the coder specified in the capability field in this structure. Not currently supported.
extra	The contents of the IP_CAPABILITY_UNION will be indicated by the type field.
rfu	Reserved for future use. Must be set to zero when not used.

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