The General Purpose Relays on the PGD adapters allow you to control external devices off the SV8100 by pushing a feature key on a digital station. Typically the PGD will control a slave relay which in turn controls the larger device (the PGD relay does not allow anything over 24VDC or 500mA).
Common uses include gate openers, security lighting and anything else that needs basic on/off control.
The sheet attached here provides the basics but was for a site where the owner of the system wanted to completely disable External Paging for short periods of time while he shot his TV commercials. By pressing the GPR button on the phone the external page outputs were disabled so that an amplified page would not interrupt the recording of the TV comercial.
here for the cheat sheet.

I hate that term twining. It sounds so Avaya. AAHHHH!. Anyway here is the way you go about setting up Mobile Extension to allow internal or trunk calls to a station to ring an off site number. In most cases this will be used with the call forward “Both” feature so the internal and off site number ring at the same time. With R3 and above the incoming caller ID can be passed out to the Mobile Extension as long as this is allowed by the carrier and also calls can forward back to the NEC VM rather than go to the off site VM (cell VM). here for the cheat sheet.

For all those who shudder when asked to turn on ARS/LCR here is a basic explaination. The feature is really quite simple in the this system and can be assigned quickly and effectively helping call flow and speeding up operation especially with ISDN trunks.
Click here for the cheat sheet.
This programming will work with both IPKII and the SV8100.

The 8100 and IPKII are quite flexible when it comes to options with Ring Over Page.
Trunks can be terminated to it or you can ever transfer calls to it.
Click here for the Ring Over Page cheat Sheet.

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.

If you have ever done toll restriction on the IPK the IPKII is not that much different.
There is the added ability to restrict internal calls and also the ability to place restriction levels on trunks and not just stations.
That feature alone will bite especially when trying to forward off premise.
Click here for all the gorey details.

DID translation on the IPKII is not the easiest of things to assign. There are up to 2000 translations available as well as individual DID switching via a key on the telephone (DDI switching mode).
Click here for the doc.