Call unsuccessful - The Requested type of content encryption is not supportedhttp://blogs.technet.com/jenstr/archive/2008/07/30/call-unsuccessful-the-requested-type-of-content-encryption-is-not-supported.aspxYou might get the above error message when you try to call your voice mail hosted on Exchange 2007 SP1 UM from your Office Communicator Phone Edition (OCPE) powered device. The likely cause of the issue is a mismatch between the VoIPSecurity setting ofen-USCommunityServer 2.1 SP1 (Build: 61025.2)