Plugging in extension causes main to ring
Not particularly a vintage phone question but maybe some of you experts could help me. BT Openreach have just been and installed a new master socket (NTE5?). I asked them to reconnect the cable to the extension upstairs but when I plugged in my 706 and lifted the handset, it caused the downstairs phone to ring continuously - not just tinkle. I replaced the 706 with a modern Scepter 100 (OK, relatively modern) and it did the same. Placing an ADSL filter in front of the phone made no difference. Any idea what's happening here before I get BT back?
Thanks Ken
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