I'm in the process of taking out a Nortel MICS and putting in an IP Office. Currently, they have a loud bell that rings if the lady at the front desk does not answer the phone after 3 rings. The way it works now, is if she doesn't answer, her phone forwards to a dummy extension in the phone closet which rings an auxiliary ringer. They want to keep it where the bell rings after 3 rings. I know I need to make the ringer an analog extension on the IPO, but what would be the best way to make it ring after reception rings 3 times?