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Orange VoIP woes

Our livebox2 repeatedly used to lose the VoIP service (somewhat annoying as we don't have a 'physical' pots line, just ADSL signal on the copper pair)

however there's now a subtle hint on the config pages NOT to change the DNS servers from the automatic setting (we used to use opendns for content filtering)

So, anyone know what hard-coded voodoo sagem/orange were up to?
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