Hi I have an issue but just need a little help. My house has an extension in every room this was done back in 1987. Recently I had NO dial tone on any hand set I done all the normal checks had dial tone at master so it was my wiring which i rectified after finding it was the wire from the master to first extension from this extension i split into 2 routes (many years ago as stated) down & upstairs. After replacing that wire at this time i have all of downstairs is working fine.
i discovered that the dial tone would be on an extension box going upstairs but would only for a short time I wondered why. Before i replace is there a way to check a cable with out replacing if possible I have a multi meter. If I cant check the cable i will have run a new cable to upstairs but what puzzles me is why is the dial tone there then goes,