[asterisk-users] Correct settings for UK (BT) FXO
asterisk at raouf.net
Thu Sep 14 15:05:09 MST 2006
Brian Candler wrote:
> Is there a document somewhere giving the correct TDM400P FXO settings for
> use on a BT PSTN line in the UK? All I can find is
A patch was written for a previous version of Asterisk that got halfway
there. I found some bugs in it which took us all the way and it worked
perfectly. The original patch and my modifications and some other
modifications/enhancements were added in a later release version of
Asterisk but unfortunately for no apparent reason although it worked in
other EU countries it no longer does so in the UK. I'm afraid I forget
the exact details.
Unfortunately I've not had time to investigate the code to try and
figure out what is going on and how to fix it.
Basically it is all down to the polarity switches that happen or don't
happen on hangup. What is really required is for the code to sense the
constant tone you get when you hangup in the UK, but this is far too
complex for me to be able to deal with.
So personally I've given up on analog and I'm sticking to the digital
realm of ISDN. One day I may invest in a Sipura FXO box (or are they now
Linksys or something?) which does sense the disconnect tone.
Incidentally I think there are people on this list who have no issues
with the TDM400p in the UK, but I have no idea how/why.
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