I have a customer with a toa bg130 amplifier connected to two horns for telephone paging. I believe the paging port on the Norstar is bad. A different KSU confirms the amplifier and horns are good. I would like to know if it possible to connect this paging amplifier to a spare trunk port. I've found the manual online but I have not been successful. Does anyone know of a way to do this?

You will need one of these ahead of the amp
https://www.vikingelectronics.com/product-details.php?pid=532

thanks