What is the Cisco UCM sizing guidance for deployments of between 5,000 and 10,000 users or devices that use the medium Open Virtual Archive template?

One TFTP server lacks redundancy, and two call processing subscribers are often insufficient for optimal performance and redundancy in the 5,000-10,000 user range.

One TFTP server lacks redundancy, and one call processing subscriber is significantly insufficient for the 5,000-10,000 user range, offering no redundancy for call processing.

While two TFTP servers provide good redundancy, two call processing subscribers are generally insufficient for optimal performance and redundancy in the 5,000-10,000 user range.

Cisco UCM sizing guidelines for deployments in the 5,000 to 10,000 user/device range, especially when utilizing a medium Open Virtual Archive (OVA) template, recommend a deployment model of one Publisher, two TFTP servers, and four Call Processing Subscribers. This configuration provides ample processing capacity, robust redundancy for TFTP and call processing, and ensures high availability and optimal performance for this deployment size.