[asterisk-users] UK FXO hangup detection with a twist

[Conrad Wood]

> If we accept a call originated elsewhere, then we cannot hang it up.
> Only the call originator seems to be able to do that. The upshot is
> that if asterisk hangs-up a line, and then tries to re-use it for an
> outbound call before the remote has disconnected, we are simply
> re-connected to the original caller, and start to play DTMF at them!
> 
> Has anyone experienced this before? Anyone found a solution?

Yes I have seen that with many analogue lines in the UK. This behaviour
is somewhat 'by design' - it occurs even if you just use 2 plain old
telephones (and no asterisk).
I always forced it on-hook for (I think it was) 15 seconds before
attempting a new call on the same line, but I always had spare lines to
dial out on, so no real need to dig deeper into this ;-)

Conrad