>From: YoonHoe LOKE <[email protected]> > >Let's concentrate on (1) because that's where my main intereset is. I >bought ANSI/EIA/TIA-464 last year and I got the idea of reverse polarity >from this standard itself. The section says that... > >--- >4.1.2.3.2 Detecting Far-end Answer Supervision >Far-end answer supervision can be provided from some network offices. A PBX >may, optionally, use this capability to enhance call accounting features. >Following called party answer, the network (where equipped for this >service) will reverse the tip and ring polarity on the access line. This >reversal will be maintained as long as the connection is maintained and the >called party remains off-hook. >--- > >Since this is an American National Standard, I presume that this service >should be available in the USA. Maybe I am wrong. > >I am hoping that someone in TREG can confirm this and perhaps tell me what >the US phone companies call this service. Incidently, I am from Malaysia >and I've tried to talk to Bell South but they don't seem to know what I am >asking for.
As far as I know all COs in the U.S. & Canada *do* provide answer supervision on ground start lines to a PBX, but there's always the possibility of some "mom & pop" rural telephone company that doesn't. <g> There is no specific "name" for what your asking, it's just part of the standard "answer supervision" features on a ground start telephone line. ________________________________________________________________ John Combs, Senior Project Engineer, ITS/TestMark Laboratories Email: [email protected] URL: http://www.testmark.com
