On Thursday 19 October 2006 14:57, [EMAIL PROTECTED] wrote: > Interesting, thanks. That's more than our Aliant rep was able to tell us. > He thinks that supervised disconnect is not available on home phone lines. > He does think it available on business lines though. I'll have to go to > someone's house where there's high speed and give this a shot again.
High speed's not needed... and if you are at home, simply call your house with your cell, enjoy a pleasant conversation and hang up the cell.... ... and wait... you should hear your landline go absolutely *dead* for about 3/4 of a second before you hear dialtone again. You can confirm this with a multimeter across tip+ring. There are two CPD methods I have seen: battery reversal and battery drop. Battery reversal, as the name implies, reverses the voltage on the line for a moment before restoring it to normal (-ve) polarity and presenting you with dialtone. Battery drop simply disconnects the battery for a moment. I believe that the FXO modules from Digium and Sangoma can detect both using the "kewlstart" variant of FXS signaling. The Carrier Access Access Bank I and II do *not* detect CPD. The Adit600, however, does. the ABI/II are great for FXS deployments ... cheap as hell, and I've even written a patch for Zaptel that lets you use the much cheaper and useless-for-practically-everything-else TR08 signaling format. -A.
