# Required Software and Options for Clustering

Cluster elements require the following software:

- 3300 ICP/MiVoice Business elements require 3300 ICP Release 3.2 or higher software.

- For large networks with more than sixty 3300 ICP/MiVoice Business elements, 3300 ICP Release 5.1 software (or later) is required.

- For clusters with more than two hundred fifty 3300 ICP/MiVoice Business elements, 3300 ICP Release 8.0 UR3 software (or later) is required.

- 3300 ICP/MiVoice Business elements require 3300 ICP Release 6.0 software or later to support System Data Synchronization.

- Remote Directory Number synchronization support requires MCD Release 4.0 or later software on all elements in the network or cluster.

In addition, the following feature options must be enabled at each element in the cluster:

- System Data Synchronization must be enabled in the License and Option Selection form of each cluster element (this option is enabled by default).

Related Topics

- Feature Access Codes and RDNs

- About IP Phone Registration