Check below article to complete hardware conference bridge in CME http://www.ipbalance.com/voip/voip-cucme/1448-cme-how-to-setup-hardware-conference-bridge-meetme-and-ad-hoc.html I hope it is informative for you.

Thank you so much again.Chris

Thank you for the comments.Do you know the way to upgrade ATA190 thru CUCME?I found a way with CUCM, but not CUCME.Currently, we are replacing ATA186 with ATA190.Seems like setting will be a lot different from ATA186(IOS gateway setting, SIP proxy).C...

JH,Have you figure it out?Please adviseChris