Thank you very much Tony for getting back to me. I should have also mentioned I know little about telephony and wiring! But that said, I have looked inside the junction boxes and found the following:
Both extensions - Green from phone cord wired to green with white stripe AND white with green stripe. These all terminate (ie 4 cables) under terminal 13 on the plan phone terminal block. Then a brown cable runs from terminal block into base unit. It appears red and white of line cord into main phone are used and blue and green are not.
Hope this means something to you!
Many thanks
Jason
Quote:
Originally Posted by JohnBHanson
Some versions of planset use a transistor to detect the extension being off hook rather than a relay. This makes it polarity sensitive.
Also external extensions use need an earth to work ringing the main.
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Thank you John. This is a very late model if that helps determine if transistor or relay use? Sounds like you can hear a relay though when extension calls main whilst the exchange line is switched through (ie instead of hearing the buzzer you can hear a click)