2.2.4.1.3.55 SelectExtVersion

The SelectExtVersion packet is transmitted from a TAPI client to a TAPI server in a remote procedure call. Sending this packet selects the indicated extension version for the indicated line device. Subsequent requests operate according to that extension version.


0


1


2


3


4


5


6


7


8


9

1
0


1


2


3


4


5


6


7


8


9

2
0


1


2


3


4


5


6


7


8


9

3
0


1

Req_Func

Reserved1

hLine

dwExtVersion

Reserved2

Reserved3

Reserved4

Reserved5

Reserved6

Reserved7

Reserved8

Reserved9

Reserved10

Reserved11

Reserved12

Req_Func (4 bytes): The identifier of the function that will be invoked on the remote server. This value MUST be set to 128.

Return Values

On completion of ClientRequest, this field contains the result of the encapsulated telephony request. A value of 0 indicates success, and a LINEERR_Constants value indicates failure. The remote server MUST complete this call synchronously.

MUST return zero if the function succeeds or an error number if an error occurs. Common return values are as follows:

Name

Value

LINEERR_INCOMPATIBLEEXTVERSION

0x8000000D

LINEERR_OPERATIONFAILED

0x80000048

LINEERR_NOMEM

0x80000044

LINEERR_RESOURCEUNAVAIL

0x8000004B

LINEERR_OPERATIONUNAVAIL

0x80000049

Reserved1 (4 bytes): An unsigned 32-bit integer. MUST be set to zero when sent and MUST be ignored on receipt.

hLine (4 bytes): An HLINE. The handle to the line where an extension version is to be selected. This field MUST have been obtained by sending the Open packet.

dwExtVersion (4 bytes): An unsigned 32-bit integer. The extension version to be selected. This version number has been negotiated by using the NegotiateExtVersion packet. The most-significant WORD is the major version number and the least-significant WORD is the minor version number. Calling this function with a dwExtVersion of zero cancels the current selection.

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.

Reserved11 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.

Reserved12 (4 bytes): An unsigned 32-bit integer. This field is used for padding and MUST be ignored on receipt. It can be any value.