With an amplifier that has a 600 Ohm T/R (Tip and Ring) input:
connect the analog station port directly to the T/R input of the amplifier
make sure there is a User that matches the port (we make it 234 here)
Change the Extension port setting in the Analogue Tab to be "Paging Speaker"
create a shortcode
Line ID doesn't matter
You can now add the user created for the paging extension to a huntgroup and can page the entire huntgroup with another "Dial Paging" shortcode having the group extension in the Telephone Number field
Should you have a non telephony paging amplifier then your impedance is around 10kOhm and you will need to use impedance matching devices like the WMT1A which is simply put between the IPO station port and the amplifier input. This device can also be used if you need to have several inputs and use the AUX input on a regular amp.