I've run into an intersting problem. I have a hotel that has two suites with two phones in each one. The main phones work fine. The secondary phones can dial 9 and make outbound calls. However, they cannot make internal calls. When they attempt to dial internally, they get a fast busy signal. Two phones in each suite are half tapped so they are using one extension. I'm not utilizing suite services (System Option 84 - Multiple Guest Suite Phones) in the system because there are only two suites in the hotel.