Core Issue
Network Address Translation (NAT) with support for the Microsoft NetMeeting application requires either a J or an O image, enterprise feature set, or Cisco IOS Software Firewall feature set respectively.
Resolution
You need to be running a Cisco IOS Software version that supports NetMeeting.
For a list of Cisco IOS Software versions that support the different versions of NetMeeting, refer to Cisco Feature Navigator
To download a Cisco IOS Software version that supports NetMeeting, refer to Cisco Downloads.