Conference With MeetMe

HI All.
I install FreePBX
and add seven polycom IP 4000 phones. they work perfect.
now i need to make conference call to invite all to the meetme room
if someone call number 100 system must invite all users to conference room
with sending alert info to polycom’s like “ring-answer” and thay entering to the meetme room without user actions.

can you someone help me…