Here is how to muddle your way through the 8100 (and 8300) licensing server to get the codes to make things work.
Remember you have 60 days of all features wide open after you turn on the CPU for the first time.

Your license codes must be loaded within that 60 days or the customer’s gonna come into work on day 61 and get a hell of a shock.
Note: The 60 period only gives you 64 ports. To expand to 256 ports go to CM 90-55-01 and make it a 1. No CPU reset required.
Note: It is recomended to disable the free license when installing the UM8000. This way the UM8000 only takes the number of ports it is licensed for. If you do not turn off the free license it will take 16 ports which may take you over you maximum ports
To disable the freeby go into telephone programming CM 90-55-01 and make it a 0. If it is already a 0 change it to a 1, back out of programming and then go back to CM 90-55-01 and set it to a 0.
To confirm the license is off see CM 10-52-01. If it says Remain Days 0 the free license is disabled. You can re-enable the free license at any time by again making CM 90-55-01 a 1.
Click here for the licenseing doc.