So looking for someone who has experience with the Snom PA1 units. What i have is a customer with PA speakers throughout there shop. They want to have music play through these speakers until someone pages through the PA1 unit, once the page is complete the music would come back on. What we were thinking is placing a relay switch between the music source and the PA amp. When the PA1 unit is called it would trigger the relay to stop the music. The issue is we cant seem to figure out on the PA1 unit which IO1 or IO2 connections can be used for the relay. Does anyone have any idea how to accomplish this? I have attached a rough drawing of what we were thinking.