| TAPI_REPLY | WM_USER + 99 |
| |
| TAPIERR_CONNECTED | 0L |
| TAPIERR_DROPPED | (-1)L |
| TAPIERR_NOREQUESTRECIPIENT | (-2)L |
| TAPIERR_REQUESTQUEUEFULL | (-3)L |
| TAPIERR_INVALDESTADDRESS | (-4)L |
| TAPIERR_NOREQUESTRECIPIENT | (-5)L |
| TAPIERR_REQUESTQUEUEFULL | (-6)L |
| TAPIERR_INVALDESTADDRESS | (-7)L |
| TAPIERR_INVALWINDOWHANDLE | (-8)L |
| TAPIERR_INVALDEVICECLASS | (-9)L |
| TAPIERR_INVALDEVICEID | (-10)L |
| TAPIERR_DEVICECLASSUNAVAIL | (-11)L |
| TAPIERR_DEVICEIDUNAVAIL | (-12)L |
| TAPIERR_DEVICEINUSE | (-13)L |
| TAPIERR_DESTBUSY | (-14)L |
| TAPIERR_DESTNOANSWER | (-15)L |
| TAPIERR_DESTUNAVAIL | (-16)L |
| TAPIERR_UNKNOWNWINHANDLE | (-17)L |
| TAPIERR_UNKNOWNREQUESTID | (-18)L |
| TAPIERR_REQUESTFAILED | (-19)L |
| |
| TAPIMAXDESTADDRESSSIZE | 80L |
| TAPIMAXAPPNAMESIZE | 40L |
| TAPIMAXCALLEDPARTYSIZE | 40L |
| TAPIMAXCOMMENTSIZE | 80L |
| TAPIMAXDEVICECLASSSIZE | 40L |
| TAPIMAXDEVICEIDSIZE | 40L |