Bulk Two way SMS Software using GSM Modem

We want a Two way Bulk SMS sending (using GSM Modem) software to be developed using open source or proprietory .NET libraries(SMSLib). # The application should work with all existing GSM Modems. # Should be able to create user groups(should be able to send bulk SMSs).Database to be used for storage of data should be MySQL or MS [login to view URL] to Add,delete groups and users under groups. # Two way SMS should be possible. # The interface should be similar to the trial one developed using mCore(click on the link below).. but should also provide bulk SMS sending option) # Ability to import userlists from Access,Excel,CSV and from XML files *Library to be used is smslib ([login to view URL])