It can be done using cisco IOS gateway, TCL script and CME.I have implemented and it is working.  

Hi It has nothing to do with callmanager's version. Call Manager just forwards the group call number to the voice gateway.TCL script running on a callmanager express, which creates conference room and makes predefined called numbers  join the confere...

Hi,Where can I find  these files? Can you please send?number2name.tclnumber2name-http.tclnummer3.php 

It can be done via script.. best regards,