I have a Cisco 2851 ISR with 1 PVDM2-48 running IOS v12.4(9)T7 Release software (fc3) and CME 4.0. I would like to be able to enable conference bridging and meetme conference with more than 3 people. Is that possible with what I have currently? Can I utilize the PVDM2-48 alone or do I need another module? Or would I need to upgrade my IOS and CME version to 4.1 before this can be done? Can someone please inform me what would be required to do this? Thank you.