atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems Avaya IP Office...paging port?

On the IPO, use an analog station port to drive the loud bell, program that S/L extension to Internal Twin the digital phone.

You could get cheezy, use a Viking PA2A, pull the phone apart and clip onto the speaker leads for the input to Viking amp.