From Data on the Web Best Practices
Dial in details
Joining instructions: (official participants and invited guests only) Join using WebEx in your browser Or you can dial in through +1-617-324-0000 (US Toll Number) Access code: 647 415 866
Also, you should join IRC channel: #DWBP on irc.w3.org on port 6665 Please type 'present+ your IRC nick. It helps if you use the same nick on IRC and WebEx.