|Look in The BIOS and see if there is a Wake-on-Ring option. It used to be fairly common when analogue Modems were normal. It is not so common these days though. Now it is mostly Wake-on-LAN.|
Wake-on-ring monitor the com ports and wakes the computer when it detects the ring signal on the RS2332 Serial port. If there is no Wake-on-ring option in the BIOS the you are of of luck.