Fixed no sound device fallback behaviour in ConferenceBridge

darcs-hash:20090713094713-58103-ef021d45329065f309dfb70b09aecb92d95ea803
Modified Logger to not log SIPEngineLog and SIPEngineSIPTrace notifications

Ignore-this: a83d8e22a4afa043f48ccce8926d5046

darcs-hash:20090713141826-1e3d8-3adea91ef15670027df1bb8b6e78666c64923aed