Source note · Unified CM virtualization and sizing
A standard Unified CM cluster may have at most 4 call-processing subscribers plus 4 standby, for 8 call-processing subscriber nodes in total.
Checked 2026-09-25
The number of call processing subscribers in a cluster cannot exceed 4, plus 4 standby, for a total of 8 call processing subscriber nodes.
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- cluster sizing
- Deployment
- on-premises
- Region
- not restricted
- Release range
- CSR 14
- Checked
- 2026-09-25
Sources
- Cisco Collaboration Sizing Guide - Collaboration Sizing Guide for CSR 14 — Cisco Systems · tier 2 current vendor documentation · Virtual Nodes and Cluster Maximums
Cite this note
APA
WarmTransfer. (2026, September 25). Unified CM virtualization and sizing: source note cucm-virtualization-sizing-csr14-max-subscribers. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-virtualization-sizing-csr14-max-subscribers
BibTeX
@misc{warmtransfer-claim-cucm-virtualization-sizing-csr14-max-subscribers,
title = {Unified CM virtualization and sizing: source note cucm-virtualization-sizing-csr14-max-subscribers},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-virtualization-sizing-csr14-max-subscribers},
note = {Source note cucm-virtualization-sizing-csr14-max-subscribers, checked 2026-09-25}
}