/mcpExtension Mobility Cross Cluster Restrictions Table 38: Extension Mobility Cross Cluster Restrictions Description Restriction • EMCC does not support the intercom feature, because intercom configuration requires a static device. • EMCC does not support Location CAC, but supports RSVP-based CAC. • Phones with IPv6 only addressing mode do not support EMCC. You can use phones that either use IPv4 or dual stack addressing modes. Unsupported Features For EMCC to function properly, you cannot configure the same phone (device name) in two clusters. Otherwise, login fails due to the duplicate device error (37). Therefore, for cluster that is deployed with EMCC you should disable Autoregistration on all Unified Communication Manager nodes to prevent a new device being created in the home cluster after EMCC logout. EMCC Device Cannot Be Provisioned in More Than One Cluster Cisco Unified Communications Manager can support a MaxPhones value of 60,000. Include EMCC in the total number of devices that are supported in the cluster by using the following calculation: Phones + (2 x EMCC devices) = MaxPhones Note EMCC login does not affect the number of licenses that are used in the home cluster. Number of EMCC Devices • If the home cluster administrator disables EMCC for a user while the user is logged in with EMCC, the system does not automatically log this user out. Instead, the system does not allow future EMCC attempts by this user. The current EMCC session continues until the user logs out. • In the visiting cluster, the Phone Configuration window has a Log Out button for extension mobility. This button is also used by the visiting cluster administrator to log out an EMCC phone. Because the EMCC phone is not currently registered with the visiting Cisco Unified Communications Manager, this operation is like a database cleanup in the visiting cluster. The EMCC phone remains registered with the home Cisco Unified Communications Manager until the phone returns to the visiting cluster because of a reset or a logout from the home cluster. Visiting Device Logout Limitations Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 444 Receiving Calls Extension Mobility Cross Cluster Restrictions