[VoiceOps] WebEx and 1-Way Audio Mid Conference

All, We've been getting a number of reports recently from customers about what they are calling "dropped calls" (thanks Cingular commercials) on WebEx TF conference lines, meaning they lose an audio path mid-call. This usually impacts only the one caller (other callers on the bridge are apparently not impacted) and we're getting these reports for calls traversing a variety of termination carriers with not much of anything else in common. Anyone else getting similar reports or dealt with something similar with WebEx? Thanks, -Scott