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
http://www.voip-info.org/wiki/view/UK+Asterisk+Details


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.

Faris.

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