I have someone wanting me to install a 3x8 expansion board and connect a 4th line to a Vodavi system with Infinite phones (customer is providing the board). I have extensive experience with the XTS/STS and DHS but not with other Vodavi stuff. The KSU has a part number of 5000-00 Rev E Basic ISS 1. I have a DVX Mach 1 programming manual if that is what this is. Anyone shed any light on this? Seems like a no-brainer, but I want to avoid any suprises.