Prior to version 2.4, you could only purchase an activation key with SIP media encryption enabled. (Media includes audio, video, content video and ActiveControl data.) From version 2.4, you have the choice of purchasing an activation key with SIP media encryption enabled or SIP media encryption disabled (unencrypted SIP media) for the Cisco Meeting Server 1000, Cisco Meeting Server 2000 and the VM software image. Choose either encrypted or unencrypted options under the software pids R-CMS-K9 and R-CMS-2K-K9.
For more information on using the activation key for unencrypted SIP media, see Appendix C of the Deployment Guide.