I having CCM 4.2. My maximum number of ad hoc conference is 4 by default. I changed the Max number Ad Hoc conference value to 6 under the service parameters for all the call manager in the cluster.
But even then when adding the 5th participant I am getting a "Maximum conference limit reached" error in the Phone.
I have even started restarting the Cisco Voice Media Streaming Application services under Control center for all the servers.
Can anyone have any idea how to solve this ?