During the ALERT installation process, please select the SMPP driver from the list below.
After the successful installation add the driver (1) and enable it (2)
(ALERT -> Configuration -> Communication -> select tab Drivers)
Excursus: if the driver isn't available, please add it by pressing the Button "New driver..." and select the SmppDrv.dll
Underneath you will see the SMPP Driver in the Communication dialog box, the SMPP driver is now ready to use.