Added transfer fix
Added dtmf passthrough support
Added dtmf passthrough support
Added dtmf passthrough support
Added conference creation fix
Merged branch 2.0 to master
fix #14

tel URI scheme is not supported on headers different than From or To
Removing unnecessary files
Fix Issue #15 - A re-INVITE with inband DTMF is not enabling inband detection
Merge remote-tracking branch 'origin/2.0'