Akuhn,
I am not sure if you still need help with this, but this is typically considered a simple setup; with a couple of caveats.
1. The key you program it on works just like a normal PKM/DSS/BLF.
2. It will alert the phone when the amount of calls set in the Ring When field is either ringing or camped on at the station set in the Selection field.
3. The user has to press the button to answer the call.
4. They have to be on the same node as the phone they are monitoring.
Typically it won't ring the phone when the Ring When is set to 0 or the amount of calls has not been reached yet.
Your test was a good one, but did the user see the Secondary Extension light up showing a call or did nothing at all happen?
Thanks,
TE