A customer has an existing network of three IP Office systems with Small Community Networking and Voicemail Pro at their main location. Each location has their own set of outside lines. They would…

A customer has an existing network of three IP Office systems with Small Community Networking and Voicemail Pro at their main location. Each location has their own set of outside lines. They would like to add in redundancy for their voicemail server in case the network between the main office and the remote office goes down. Which two must be added to the IP Office network and configuration to accomplish this? (Choose two.)