The lineDial function dials the specified dialable number on the specified call.

LONG lineDial(

HCALL hCall,

LPCSTR lpszDestAddress,

DWORD dwCountryCode




A handle to the call on which a number is to be dialed. The application must be an owner of the call. The call state of hCall can be any state except idle and disconnected.


The destination to be dialed using the standard dialable number format.


The country code of the destination. This is used by the implementation to select the call progress protocols for the destination address. If a value of zero is specified, a service provider-defined default call progress protocol is used.

Return Values

Returns a positive request ID if the function will be completed asynchronously, or a negative error number if an error has occurred. The dwParam2 parameter of the corresponding LINE_REPLY message is zero if the function is successful or it is a negative error number if an error has occurred. Possible return values are:



If LINEERR_INVALADDRESS is returned, no dialing has been done. If LINEERR_DIALBILLING, LINEERR_DIALQUIET, LINEERR_DIALDIALTONE, or LINEERR_DIALPROMPT is returned, none of the actions otherwise performed by lineDial have occurred. For example, none of the dialable addresses prior to the offending character has been dialed, no hookswitch state has changed, and so on.

The lineDial function is used for dialing on an existing call appearance. For example, after a call has been set up for transfer or conference, a consultation call is automatically allocated, and the lineDial function would be used to perform the dialing of this consultation call. Note that lineDial may be invoked multiple times in the course of multistage dialing, if the line's device capabilities allow it. Also, multiple addresses may be provided in a single dial string separated by CRLF. Service providers that provide inverse multiplexing can establish individual physical calls with each of the addresses and can return a single call handle to the aggregate of all calls to the application. All addresses would use the same country code.

Dialing is considered complete after the address has been passed to the service provider; not after the call is finally connected. Service providers that provide inverse multiplexing may allow multiple addresses to be provided at once. The service provider sends LINE_CALLSTATE messages to the application to inform it about the progress of the call. To abort a call attempt while a call is being established, the invoking application should use lineDrop.

An application can set the lpszDestAddress parameter of the lineDial function to the address of an empty string to indicate that dialing is complete, but only if the previous calls to the lineMakeCall and lineDial functions have had the strings specified by lpszDestAddress terminated with semicolons.

See Also

LINE_CALLSTATE, LINE_REPLY, lineDrop, lineMakeCall

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