[Asterisk-Users] Do I need a ring capacitor to use TDM400P cards in UK

[Angus Comber]

Hello

I have played about with a TDM400 card and plugged in some standard analog phones.  I am using the card in FXS mode - for analog extensions.  I did notice that one of my phones did not ring and I wondered why.  I later read in Paul Mahler's book VoIP Telephony with Asterisk that in his section on the TDM400 on page 127 he says "In the UK, you may need an adapter that provides a ring capacitor, or the phone may not ring."   

Can anyone confirm this.  Also what is one of those and where would I find a good supplier?  I am in the trade so wholesale would be OK.

Angus Comber
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