> How does a hotel/motel in USA determine when to charge for long distance calls > made by guests ? Could they be using : > > 1) Reverse Battery Answer Supervision or Line polarity reversal > 2) Pulse Metering > > or something else ? > > Can anyone tell me what types of call answer supervision options are available > on loop start lines from local phone companies in the USA ? > Hotels use PABXs (Private Automatic Branch Exchanges) and supervising what hotel guests do is not done by the Telephone Company (unless they provide the PABX).
Hence, your question would appear to be How does the PABX supoervise what the guests do, rather than what the PSTN does. The PSTN only knows that the hotel is making long distance calls, not who in the hotel is doing that. There are various supervision schemes in use in North America between PABXs and the PSTN. It all depends on whose PABX from what vintage is in use. Pulse metering is not one of the options used in North America. I need to have a clearer understanding of what exactly you intended to ask. Ciao, Vic
