looking for website similar to http://www.webex.com/

Hi all. we are looking for website like [login to view URL], which need to be developed following functionality. 1) Author/company employee can register to website to post Web-conference. just like [login to view URL], package for monthly as well as hourly. Aother will deside th co-partner as expert for conference meeting will be present for face to face meeting with audience. Author can choose if he want to publish 3 to many ( author and 2 expert with many audience). or he want visite one by one audience, Note:- for one by one visiting audience :- i) he can invite bulk by sending email, as well as other user who see published web-conference can send request to attend conference. ii) for Open Conference one by one, we need waiting room for each web-conference- it work similar to waiting room. Author or Employee will invite one by one person for web-conference will other will be waiting in waiting room of conference. where all can see presentation set by employee. in main conference room only person who authorised by Author/employee can are available. Video quality must be simple as wellas HD quality web conferencing. as same as in [login to view URL] 2) user need can attend limited no. of conference, on the basis of no. of conference he can upgrade membership . also need In build invite function (invite friend from gmail/yahoo/facebook/twitter) to increase no. of conference he can attend. other function will remain same as in [login to view URL] We want only experience Developer who can finish this task within a time. we also need Mobile application for same. Regards Vinodsr