I inherited a Cortelco Millenium DBCS-16 at my current office and we are needing to add more digital lines to the system. I have the additional digital cards but no Manual on how to install/configure the system to use them since the previous tech decided to take this half of it with them so I only have the last few chapters about the mailbox config... So if anyone can enlighten me on how to do this or if you have a install/config manual I would really appreciate it....