/mcpEditable after Installation Description Configuration Data Yes In Cisco Unified Communications Operating System Administration, select Settings > NTP Servers. During installation of the IM and Presence publisher node, you must specify the IP address of an external Network Time Protocol (NTP) server. We recommend that you use the Unified CommunicationsManager publisher node as the NTP server. NTP Server IP Address Export Restricted and Export Unrestricted Software This release of Unified Communications Manager and IM and Presence Service supports an export unrestricted (XU) version, in addition to the export restricted (K9) version. Unrestricted versions of software are intended only for a specific set of customers who do not want various security capabilities; unrestricted versions are not intended for general deployments. Note Export unrestricted versions differs from restricted versions as follows: • Encryption of user payload (information exchange) is not supported. • External SIP interdomain federation with Microsoft OCS/Lync or AOL is not supported. • After you install an unrestricted release, you can never upgrade to a restricted version. A fresh install of a restricted version on a system that contains an unrestricted version is also not supported. • All nodes within a single cluster must be in the same mode. For example, Unified Communications Manager and IM and Presence Service in the same cluster must either all be in unrestricted mode or all be in restricted mode. • IP Phone security configurations are modified to disable signaling and media encryption (including encryption provided by the VPN phone feature). Be aware that after you install an unrestricted release, you can never upgrade to a restricted version. You are not allowed to perform a fresh installation of a restricted version on a system that contains an unrestricted version. Note For all Graphical User Interfaces (GUIs) and Command Line Interfaces (CLIs), the Administrator can view the product version (restricted or export unrestricted). The following table describes the GUI items that are not available for the export unrestricted version ofUnified Communications Manager and IM and Presence Service. Installation Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs 32 Planning the Installation Export Restricted and Export Unrestricted Software