Source note · Unified CM LDAP directory sync and authentication

Cisco's Release 15 Enterprise Groups chapter gives 160,000 as the maximum number of user accounts in the Unified CM database, and the 2017 multi-forest note gives 160,000 synchronized accounts for CUCM 10.0(1) and later.

disputed · Checked 2026-09-25

Vendor: Cisco
Product: Cisco Unified Communications Manager
Subsystem: LDAP sync capacity
Deployment: on-premises
Region: not restricted
Release range: Release 15 and SUs (Enterprise Groups chapter); 10.0(1) and later (2017 note)
Status: disputed
Checked: 2026-09-25

Sources

Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Enterprise Groups — Cisco Systems · tier 2 current vendor documentation · Enterprise Groups > limits (maximum user accounts)

Cite this note

APA

WarmTransfer. (2026, September 25). Unified CM LDAP directory sync and authentication: source note cucm-ldap-integration-user-capacity-160k. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-ldap-integration-user-capacity-160k

BibTeX

@misc{warmtransfer-claim-cucm-ldap-integration-user-capacity-160k,
  title  = {Unified CM LDAP directory sync and authentication: source note cucm-ldap-integration-user-capacity-160k},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/cucm-ldap-integration-user-capacity-160k},
  note   = {Source note cucm-ldap-integration-user-capacity-160k, checked 2026-09-25}
}

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