TAPI Error Values
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TAPIERR_INVALDESTADDRESS
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The pointer to the destination address is not valid, is NULL, or the destination address string is too long.
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TAPIERR_INVALPOINTER
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The pointer does not reference a valid memory location. One or more of the pointers lpszDestAddress, lpszAppName, lpszCalledParty, or lpszComment have been specified but are invalid.
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TAPIERR_NOREQUESTRECIPIENT
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No recipient application is available to handle the request. The user should start the recipient application and try again.
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TAPIERR_REQUESTFAILED
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The request failed for unspecified reasons.
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TAPIERR_REQUESTQUEUEFULL
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A recipient application is active, but the request queue is full or there is insufficient memory to expand the queue. The application can try again later.
Any other TAPIERR_ values are nonfunctional in Win32-based applications and must not be used.