How do I figure out how many calls my Definity G3 switch will support on a conference call? I know they will only support 5 (for a total of 6 parties) on the digital side....but what about analog? Also is the 5 a limitation on the phone or on the switch? We are using TN2224B digital cards with 6416D+ phones along with a TN793 analog card. Any help would be great!