For one, the other, or both.
To overhead, and phones.
SC=*87
dial paging
TN=Hung group with analog paging ext, and digital phones in it. for instance, HG5200 group, no VM, no Que
To overhead only
SC=*88
dial paging
TN HG w/just paging ext in the group. same HG parameters as above.
I assume you know how to do one to page just the phones.
On the analog ext paging port.
Set ext to speaker. off for caller display type, MWL inidication type=None
Set user to no VM
connect the tip and ring on the analog station port to a wmt1-A matching transformer that comes inside the UPAM box. { you can get these seperate also from the UPAM]
Connect tip/ring to the screw down terminals, the RCA plug to the HI-Z rca input on the amp{AUX input}
You do not need a UPAM, or anything else for paging.
You might need to reboot the ipo with all this connected to get the analog station port to go into, and stay in an off hook status, in order for the port to stay open to let the paging signal through to the amp.
From the other sites via the wan, KWING has it all down above.