Just to circle back on this, I got with my vendor, who was extremely helpful and explained that the computer that supposed to receive the smdr stream needs to send a "polling" message to the PBX, and then the PBX will send SMDR records to it. He also sent me an SMDR Manual that's not on the DVD that comes with the SV8500, which explained in detail the protocol between the pbx and the computer. With that, I was able to write a program that now polls the smdr records from the pbx.