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I've just had polarity reversal provisioned by our telco to test hangup detect with a TDM400P I've set hanguponpolarityswitch=yes in zapata.conf When I start Asterisk I get "ignoring hanguponpolarityswitch" in /var/log/asterisk/messages I assume that the option is either not valid or conflicts with another setting somewhere. Any ideas?

> > First, ensure the TDM card has been defined to match the telephony > standards for each country where the card is installed. Bad echo on these outside North America is likely to be because of impedance mismatch. Echo cancel isn't likely to properly fix it. I was surprised at the lack of info about setting up the TDM cards for various countries. I eventually worked it out from a