You're welcome and I hear ya. Many times the information presented to me is inaccurate or needs clarification which is why I like talking directly to to the customer.It appears to be a paging system that provides a trunk to the PBX, possibly with a console somewhere that appears similar to a digital multi line phone. In another school system we have the console provides a trunk which is fed to the PBX via an RJ-11 jack in the office.