LINECALLPARAMS structure (tapi.h)
The LINECALLPARAMS structure describes parameters supplied when making calls using the lineMakeCall and TSPI_lineMakeCall functions. The LINECALLPARAMS structure is also used as a parameter in other operations, such as the lineOpen function.
The comments to the right of the syntax block indicate the default values used when this structure is not provided to lineMakeCall.
Syntax
typedef struct linecallparams_tag {
DWORD dwTotalSize;
DWORD dwBearerMode;
DWORD dwMinRate;
DWORD dwMaxRate;
DWORD dwMediaMode;
DWORD dwCallParamFlags;
DWORD dwAddressMode;
DWORD dwAddressID;
LINEDIALPARAMS DialParams;
DWORD dwOrigAddressSize;
DWORD dwOrigAddressOffset;
DWORD dwDisplayableAddressSize;
DWORD dwDisplayableAddressOffset;
DWORD dwCalledPartySize;
DWORD dwCalledPartyOffset;
DWORD dwCommentSize;
DWORD dwCommentOffset;
DWORD dwUserUserInfoSize;
DWORD dwUserUserInfoOffset;
DWORD dwHighLevelCompSize;
DWORD dwHighLevelCompOffset;
DWORD dwLowLevelCompSize;
DWORD dwLowLevelCompOffset;
DWORD dwDevSpecificSize;
DWORD dwDevSpecificOffset;
DWORD dwPredictiveAutoTransferStates;
DWORD dwTargetAddressSize;
DWORD dwTargetAddressOffset;
DWORD dwSendingFlowspecSize;
DWORD dwSendingFlowspecOffset;
DWORD dwReceivingFlowspecSize;
DWORD dwReceivingFlowspecOffset;
DWORD dwDeviceClassSize;
DWORD dwDeviceClassOffset;
DWORD dwDeviceConfigSize;
DWORD dwDeviceConfigOffset;
DWORD dwCallDataSize;
DWORD dwCallDataOffset;
DWORD dwNoAnswerTimeout;
DWORD dwCallingPartyIDSize;
DWORD dwCallingPartyIDOffset;
DWORD dwAddressType;
} LINECALLPARAMS, *LPLINECALLPARAMS;
Members
dwTotalSize
Total size allocated to this data structure, in bytes. This size should be big enough to hold all the fixed and variably sized portions of this data structure.
dwBearerMode
Bearer mode for the call. This member uses one of the LINEBEARERMODE_ constants.
If dwBearerMode is zero, the default value is LINEBEARERMODE_VOICE.
dwMinRate
Minimum data rate requested for the call's data stream, in bps (bits per second).
dwMaxRate
Maximum data rate requested for the call's data stream, in bps (bits per second). When making a call, the service provider attempts to provide the highest available rate in the requested range (dwMinRate to dwMaxRate). If a specific data rate is required, both dwMinRate and dwMaxRate should be set to that value. If an application works best with one rate but is able to degrade to lower rates, the application should specify these as the maximum and minimum rates, respectively. If dwMaxRate is zero, the default value is as specified by the dwMaxRate member of the LINEDEVCAPS structure. This is the maximum rate supported by the device.
dwMediaMode
Expected media type of the call. This member uses one of the LINEMEDIAMODE_ constants.
If dwMediaMode is zero, the default value is LINEMEDIAMODE_INTERACTIVEVOICE.
dwCallParamFlags
Collection of Boolean call-setup parameters. This member uses one or more of the LINECALLPARAMFLAGS_ constants.
dwAddressMode
Mode by which the originating address is specified. This member uses one of the LINEADDRESSMODE_ constants.
dwAddressID
Address identifier of the originating address if dwAddressMode is set to LINEADDRESSMODE_ADDRESSID. An address identifier is permanently associated with an address; the identifier remains constant across operating system upgrades.
DialParams
Dial parameters to be used on this call, of type LINEDIALPARAMS. When a value of 0 is specified for this field, the default value for the field is used as indicated in the DefaultDialParams member of the LINEDEVCAPS structure. If a nonzero value is specified for a field that is outside the range specified by the corresponding fields in MinDialParams and MaxDialParams in the LINEDEVCAPS structure, the nearest value within the valid range is used instead.
dwOrigAddressSize
Size of the originating address field, in bytes.
dwOrigAddressOffset
Offset from the beginning of the structure to the variably sized field holding the originating address. The format of this address is dependent on the dwAddressMode member. The size of the field is specified by dwOrigAddressSize.
dwDisplayableAddressSize
Size of the displayable string including the null terminator, in bytes.
dwDisplayableAddressOffset
Displayable string used for logging purposes. The content of these members is recorded in the dwDisplayableAddressOffset and dwDisplayableAddressSize members of the call's LINECALLINFO message. The lineTranslateAddress function returns appropriate information to be placed in this field in the dwDisplayableAddressSize and dwDisplayableAddressOffset members of the LINETRANSLATEOUTPUT structure. The size of the field is specified by dwDisplayableAddressSize.
dwCalledPartySize
Size of the called-party information, in bytes.
dwCalledPartyOffset
Offset from the beginning of the structure to the variably sized field holding called-party information. This information can be specified by the application that makes the call and is made available in the call's information structure for logging purposes. The format of this field is that of dwStringFormat, as specified in LINEDEVCAPS. The size of the field is specified by dwCalledPartySize.
dwCommentSize
Size of the call comment field, in bytes.
dwCommentOffset
Offset from the beginning of the structure to the variably sized field holding comments about the call. This information can be specified by the application that makes the call and is made available in the call's information structure for logging purposes. The format of this field is that of dwStringFormat, as specified in LINEDEVCAPS. The size of the field is specified by dwCommentSize.
dwUserUserInfoSize
Size of the user-user information including the null terminator, in bytes.
dwUserUserInfoOffset
Offset from the beginning of the structure to the variably sized field holding user-user information. The protocol discriminator field for the user-user information, if required, should appear as the first byte of the data pointed to by dwUserUserInfoOffset, and must be accounted for in dwUserUserInfoSize.
dwHighLevelCompSize
Size of the high-level compatibility information, in bytes.
dwHighLevelCompOffset
Offset from the beginning of the structure to the variably sized field holding high-level compatibility information. The size of the field is specified by dwHighLevelCompSize.
dwLowLevelCompSize
Size of the low-level compatibility information, in bytes.
dwLowLevelCompOffset
Offset from the beginning of the structure to the variably sized field holding low-level compatibility information. The size of the field is specified by dwLowLevelCompSize.
dwDevSpecificSize
Size of the device-specific information, in bytes.
dwDevSpecificOffset
Offset from the beginning of the structure to the variably sized field holding device-specific information. The size of the field is specified by dwDevSpecificSize.
dwPredictiveAutoTransferStates
LINECALLSTATE_ constants, entry into which causes the call to be blind-transferred to the specified target address. Set to zero if automatic transfer is not desired.
dwTargetAddressSize
Size of the target dialable address string including the null terminator, in bytes.
dwTargetAddressOffset
Offset from the beginning of the structure to a string specifying the target dialable address (not dwAddressID); used in the case of certain automatic actions. In the case of predictive dialing, specifies the address to which the call should be automatically transferred. The size of the string is specified by dwTargetAddressSize.
This is essentially the same string that would be passed to lineBlindTransfer if automatic transfer were not being used. Set to zero if automatic transfer is not desired. In the case of a No Hold Conference, specifies the address that should be conferenced to the call. In the case of a One Step Transfer, specifies the address to dial on the consultation call.
dwSendingFlowspecSize
Size of the quality of service information, in bytes.
dwSendingFlowspecOffset
Offset from the beginning of the structure to a FLOWSPEC structure followed by WinSock provider-specific data, equivalent to what would have been stored in SendingFlowspec in a QOS structure. Specifies the quality of service desired in the sending direction on the call. The provider-specific portion following the FLOWSPEC structure must not contain pointers to other blocks of memory, because TAPI does not know how to marshal the data pointed to by the private pointer(s) and convey it through interprocess communication to the application. The size of the field is specified by dwSendingFlowspecSize.
dwReceivingFlowspecSize
Size of the quality of service information, in bytes.
dwReceivingFlowspecOffset
Offset from the beginning of the structure to a FLOWSPEC structure followed by WinSock provider-specific data, equivalent to what would have been stored in ReceivingFlowspec in a QOS structure. Specifies the quality of service desired in the receiving direction on the call. The provider-specific portion following the FLOWSPEC structure must not contain pointers to other blocks of memory, because TAPI does not know how to marshal the data pointed to by the private pointer(s) and convey it through interprocess communication to the application. The size of the field is specified by dwReceivingFlowspecSize.
dwDeviceClassSize
Size of the device class string including the null terminator, in bytes.
dwDeviceClassOffset
Offset from the beginning of the structure to a null-terminated string that indicates the device class of the device whose configuration is specified in DeviceConfig. Valid device class strings are the same as those specified for the lineGetID function. The size of the string is specified by dwDeviceClassSize.
dwDeviceConfigSize
Size of the device configuration data, in bytes.
dwDeviceConfigOffset
Offset from the beginning of the structure to the opaque configuration data structure. This value is returned in the dwStringSize member in the VARSTRING structure returned by lineGetDevConfig. If the size is zero, the default device configuration is used. This allows the application to set the device configuration before the call is initiated. The size of the field is specified by dwDeviceConfigSize.
dwCallDataSize
Size of the application-settable call data, in bytes.
dwCallDataOffset
Offset from the beginning of the structure to the application-settable call data to be initially attached to the call. The size of the field is specified by dwCallDataSize.
dwNoAnswerTimeout
Number of seconds, after the completion of dialing, that the call should be allowed to wait in the PROCEEDING or RINGBACK states, before it is automatically abandoned by the service provider with a LINECALLSTATE_DISCONNECTED and LINEDISCONNECTMODE_NOANSWER. A value of 0 indicates that the application does not desire automatic call abandonment.
dwCallingPartyIDSize
Size of the calling-party ID string including the null terminator, in bytes, including the null-terminating character.
dwCallingPartyIDOffset
Offset from the beginning of the structure to a null-terminated string that specifies the identity of the party placing the call. If the content of the identifier is acceptable and a path is available, the service provider passes the identifier along to the called party to indicate the identity of the calling party. The size of the field is specified by dwCallingPartyIDSize.
dwAddressType
Address type used for the call. This member of the structure is available only if the negotiated TAPI version is 3.0 or higher.
Remarks
Device-specific extensions should use the DevSpecific (dwDevSpecificSize and dwDevSpecificOffset) variably sized area of this data structure.
This structure is used as a parameter to lineMakeCall when setting up a call. Its fields allow the application to specify the quality of service requested from the network as well as a variety of ISDN call-setup parameters. If no LINECALLPARAMS structure is supplied to lineMakeCall, a default POTS voice-grade call is requested with the default values listed above.
Requirements
| Requirement | Value |
|---|---|
| Header | tapi.h |
See also
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