本節包含 TAPI 所用線條裝置結構的字母清單。 這些線路裝置結構包括：
- LINEADDRESSCAPS
- LINEADDRESSSTATUS
- LINEAPPINFO
- LINECALLHUBTRACKINGINFO
- LINECALLINFO
- LINECALLLIST
- LINECALLPARAMS
- LINECALLSTATUS
- LINECALLTREATMENTENTRY
- LINECARDENTRY
- LINECOUNTRYENTRY
- LINECOUNTRYLIST
- LINEDEVCAPS
- LINEDEVSTATUS
- LINEDIALPARAMS
- LINEEXTENSIONID
- LINEFORWARD
- LINEFORWARDLIST
- LINEGENERATETONE
- LINEINITIALIZEEXPARAMS
- LINELOCATIONENTRY
- LINEMEDIACONTROLCALLSTATE
- LINEMEDIACONTROLDIGIT
- LINEMEDIACONTROLMEDIA
- LINEMEDIACONTROLTONE
- LINEMESSAGE
- LINEMONITORTONE
- LINEPROVIDERENTRY
- LINEPROVIDERLIST
- LINEREQMEDIACALL
- LINEREQMAKECALL
- LINETERMCAPS
- LINETRANSLATECAPS
- LINETRANSLATEOUTPUT