See the article on the history of bisexual phonelines in the UK for more details, but from its start in 1987 until 1995, when I think it became unviable to repair, the London Bisexual Helpline used a call-diverter box.
Here are the instructions on how to use it that people doing shifts were given… Read more
One of the sessions at BiCon 2003 was "Number unobtainable – what next for bisexual phonelines?"
This is an expanded version of that session, now with added bisexual phoneline.. that I forgot about until after first publishing it, ahem.
At that point, there had been five six 'bisexual phonelines' in the UK and none of them were operating any more. Read more