When one SBC carries PSTN for Unified CM, the Unified CM trunk and the Direct Routing trunk, an outage or maintenance on that SBC affects both platforms at once unless a second SBC is configured as a backup route.
inferred · Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- architecture
- Deployment
- multi-tenant, on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Configure call routing for Direct Routing — Microsoft · tier 2 current vendor documentation · Derived from Call routing overview (active and backup SBCs) and Example 1 call flows
Cite this note
APA
WarmTransfer. (2026, September 24). Building a hybrid Unified CM and Teams Phone environment for a phased migration: source note cucm-teams-hybrid-build-inf-shared-sbc-blast-radius. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-teams-hybrid-build-inf-shared-sbc-blast-radius
BibTeX
@misc{warmtransfer-claim-cucm-teams-hybrid-build-inf-shared-sbc-blast-radius,
title = {Building a hybrid Unified CM and Teams Phone environment for a phased migration: source note cucm-teams-hybrid-build-inf-shared-sbc-blast-radius},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-teams-hybrid-build-inf-shared-sbc-blast-radius},
note = {Source note cucm-teams-hybrid-build-inf-shared-sbc-blast-radius, checked 2026-09-24}
}