The Duplication parameters option is visible and accessible after Duplex deployment. Configuring duplication parameters ensures that the telephony applications run without interruption even when the primary virtual machine is not functional. Communication Manager supports two types of virtual machine duplication: software-based duplication and encrypted software-based duplication.

The duplication type setting must be the same on both the virtual machines. If you are changing the duplication parameters settings, ensure that you make the changes in the following order: