llamallama

We are connecting a ring down circuit that is kept offhook with a resistor and connected to a CO port. The CO port is set as a page port. We have orators connected to the circuit. They dial an access code to select that CO port and speak. We are trying to get a relay to work to cutoff the orator so they don't hear their own voice. We need a ground, open or closure to make this work when they dial that access code. When you tell the CO port it is a page port, the next port can't be used for a CO, what can it be used for??? Will it apply ground when 1st port is accessed???