New 3CX install and need to connect it to existing zoned paging system that uses Bogen amp and overhead paging horns/speakers. Current paging system uses 2 digits, 0 + x for zone, so 00 for all call, cold storage rooms are 02, store is 06, and so on. It's clean and simple - user places call on hold, hits 00, and speaks the voice message. I have a Linksys SPA3102 gateway that has one FXO and one FSX port. I also have a spare FXO port on a Grandstream GXW4104 gateway. Is there a video tutorial or webpage somewhere that shows the basic steps? I'm not sure even where to begin, and multiple Google searches return scan results. I'd like the finished install to be the same process for the users. TIA.