Source note · Unified CM intercluster trunks
The Preferred Architecture says ILS is required between all Unified CM clusters in a multi-cluster deployment because GDPR uses it as transport.
Checked 2026-09-25
GDPR uses Intercluster Lookup Service (ILS) as the transport medium, therefore setting up ILS between all Unified CM clusters is required for multi-cluster deployments
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- Multi-cluster design
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Collaboration 14 Preferred Architecture
- Checked
- 2026-09-25
Sources
- Preferred Architecture for Cisco Collaboration 14 Enterprise On-Premises Deployments, CVD - Call Control — Cisco · tier 2 current vendor documentation · Call Control > dial plan > GDPR
Cite this note
APA
WarmTransfer. (2026, September 25). Unified CM intercluster trunks: source note cucm-intercluster-trunks-pa-ils-all-clusters. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-intercluster-trunks-pa-ils-all-clusters
BibTeX
@misc{warmtransfer-claim-cucm-intercluster-trunks-pa-ils-all-clusters,
title = {Unified CM intercluster trunks: source note cucm-intercluster-trunks-pa-ils-all-clusters},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-intercluster-trunks-pa-ils-all-clusters},
note = {Source note cucm-intercluster-trunks-pa-ils-all-clusters, checked 2026-09-25}
}