2.2.4.1.3.4 Answer
The Answer packet is transmitted from a TAPI client to a TAPI server in a remote procedure call. Sending this packet answers the specified offering call.
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Req_Func |
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Reserved1 |
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dwRequestID |
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hCall |
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lpsUserUserInfo |
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dwSize |
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Reserved2 |
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Reserved3 |
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Reserved4 |
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Reserved5 |
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Reserved6 |
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Reserved7 |
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Reserved8 |
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Reserved9 |
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Reserved10 |
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VarData (variable) |
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... |
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Req_Func (4 bytes): An unsigned 32-bit integer. The identifier of the function that will be invoked on the remote server. This value MUST be set to 7.
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Return Values
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On completion of ClientRequest, this field MUST contain the result of the encapsulated telephony request. A nonzero request ID value indicates that the request is in progress and will complete asynchronously, and a LINEERR_Constants value indicates synchronous failure.
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Returns a positive request identifier if the function will be completed asynchronously or a negative error number if an error occurs. The dwParam2 parameter of the corresponding LINE_REPLY packet is zero if the function succeeds, or it is a negative error number if an error occurs. If the client specified a nonzero value in the dwRequestID field of the packet, the same value MUST be used for the returned positive request identifier.
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The following table shows the return values for this function.
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Value
Meaning
LINEERR_INVALCALLHANDLE
0x80000018
The handle to the call is invalid.
LINEERR_OPERATIONUNAVAIL
0x80000049
The operation is unavailable.
LINEERR_INVALCALLSTATE
0x8000001C
The call state is invalid.
LINEERR_OPERATIONFAILED
0x80000048
The operation failed.
LINEERR_INUSE
0x8000000F
The line is in use.
LINEERR_RESOURCEUNAVAIL
0x8000004B
The resources are unavailable.
LINEERR_NOMEM
0x80000044
Not enough memory is available.
LINEERR_USERUSERINFOTOOBIG
0x80000051
The user-user information is too big.
Reserved1 (4 bytes): An unsigned 32-bit integer. MUST be set to zero when sent and MUST be ignored on receipt.
dwRequestID (4 bytes): An unsigned 32-bit integer. The identifier of the asynchronous request.
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Value
Meaning
0x00000000
The server MUST generate a unique positive request ID to return as the Ack_ReturnValue.
0x00000001 — 0x7FFFFFFF
The server MUST use this value instead of generating a unique positive request ID.
hCall (4 bytes): An HCALL. A handle to the call to be answered. The application MUST be an owner of this call. The call state of hCall must be offering or accepted. One way in which the client can obtain a valid hCall is from the LINE_CALLSTATE packet sent by the remote server.
lpsUserUserInfo (4 bytes): An unsigned 32-bit integer. The offset, in bytes, in the VarData field of user-user information to send to the remote party at the time the call is answered. When this field is set to -1 (0xFFFFFFFF), no user-user information is to be sent.
dwSize (4 bytes): An unsigned 32-bit integer. The size, in bytes, of the user-user information in lpsUserUserInfo (including the null terminator). If lpsUserUserInfo is -1 (0xFFFFFFFF), no user-user information MUST be sent to the calling party and dwSize MUST be ignored.
Reserved2 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved3 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved4 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved5 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved6 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved7 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved8 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved9 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
Reserved10 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.
VarData (variable): Contains the user information that is indicated in the lpsUserUserInfo field. The user information can be an ASCII or Unicode string, and this data is opaque to the protocol.