The Messaging architecture achieves high scalability as Messaging fits and grows with various telephony deployment sizes, ranging from small branch office telephony servers to larger campus-wide telephony servers. Messaging is designed to work with large-scale installations over large, global IP networks with varying levels of network quality. For example, in a scalable deployment of the Messaging system, multiple sites can contain multiple application servers, connected to a dedicated storage server.
For further scalability, individual Messaging systems can be combined into a single voice mail network using standard voice mail networking, either directly (point-to-point) or using Message Networking.