It is not mumbo jumbo, it is electronics and it is what we deal with every time we install an IPO to a legacy paging system. Paging systems are not all alike. Some require dry contact closure supplied by the PBX, some do not. Some work off ground start, some loop start. You need to know what you are doing here. The Bogen TAM-B2 does not require DCC. Ok, so what about the IPO then? If you tell the IPO that an analog extension is a paging port then it expects to see a device at the end of the analog extension port. Does that remote device have a way of doing this? If it does not you will get .. ta da .. a busy signal. How to fix this? You install a resistor in parallel across T/R so the IPO now sees something at the other end. You have now opened a channel and are holding it open which is what the IPO expects. There is no industry standard involved. But you can make anything work if you know what each side requires. What you need to do is determined by what each side requires. In your case, you need a resistor so the IPO sees a device on hook at the other end and what it then does is open the speaker port which goes through to the Bogen. No matter how you want it to work does not matter. It is how the IPO wants it to work that matters. You need to install the resistor, set the analog extension for paging then reboot. In that order.
