Initiate Conference call with Meet Me
The conference controller first starts a conference by selecting Meet Me on his/her Cisco IP phone and dial the Meet Me directory number (DN), the rest of the conference party members simply dial the Meet Me DN just like they are dialing to another party.
Example:
Bob starts the conference by pressing Meet-Me on his IP phone, then dial 2000. Bob’s IP phone connects to the conference.
Peter and Steven pick up their IP phone and dial 2000.
Conference begins with Bob, Peter and Steven.
Pre-requisites
Check the parameters under the Server menu of CUCM 8.6(2a)


Create Meet-Me Number/Pattern
Call Routing > Meet-Me Number/Pattern

Common Device Configuration
Device > Device Settings > Common Device Configuration

Conference bridge
Media Resources > Conference Bridge

Media Resource Group and Media Resource Group List
Media Resources > Media Resource Group

Cisco Unified Serviceability
go to Cisco unified serviceability, the credential is the same as Cisco unified CM administration.
Tools > Service Activation


Sources:
http://www.tek-tips.com/viewthread.cfm?qid=1668983
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_5_1/ccmcfg/b04cnbrg.html
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_1_3/ccmsys/a05confb.html#wp1024157
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/6_1_1/ccmsys/a05confb.html#wpxref27448
Thanks … very usefull