I have upgraded from a Panther612 system to a BCM50. In the old system we had external paging zones that were off individual phone sets. We had the external paging speakers connected to the intercom on the individual set on the Panther system. So when you paged the individual set, it was broadcast over the paging speaker. Also this set was in our night service group so that when night service was on, the phone rang through the external page speaker. All of our phones are IP1220 phones. Can I do this with the BCM50 with perhaps an different type of desk phone?