Cisco's Release 15 port usage table lists TCP destination ports 389, 636, 3268 and 3269 from Unified CM to the external directory for LDAP queries, with return traffic to ephemeral ports.
Checked 2026-09-30
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- network ports
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs; current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Cisco Unified Communications Manager TCP and UDP Port Usage — Cisco Systems · tier 2 current vendor documentation · Table: Ports Between Cisco Unified Communications Manager and LDAP Directory
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up LDAP directory sync and authentication in Unified CM: source note cucm-ldap-sync-setup-ports-tcp. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-ldap-sync-setup-ports-tcp
BibTeX
@misc{warmtransfer-claim-cucm-ldap-sync-setup-ports-tcp,
title = {Setting up LDAP directory sync and authentication in Unified CM: source note cucm-ldap-sync-setup-ports-tcp},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-ldap-sync-setup-ports-tcp},
note = {Source note cucm-ldap-sync-setup-ports-tcp, checked 2026-09-30}
}