Source note · UCaaS platforms compared
Across Teams Phone, Webex Calling and Zoom Phone, documented site survivability depends on an on-premises component plus a locally terminated PSTN trunk; cloud-only carrier options such as Teams Calling Plan, Cisco PSTN or Zoom Native numbers do not by themselves give PSTN service during a site outage.
inferred · Checked 2026-09-30
- Vendor
- multi-vendor
- Product
- UCaaS
- Subsystem
- survivability
- Deployment
- hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Status
- inferred
- Checked
- 2026-09-30
Sources
- Survivable Branch Appliance for Direct Routing — Microsoft (Microsoft Learn) · tier 2 current vendor documentation · combines SBA 'Prerequisites'; cisco-help-d68vi1-site-survivability 'Supported Features & Components'; zoom-kb0063728-zpls-configure BYOC-number limitation
Cite this note
APA
WarmTransfer. (2026, September 30). UCaaS platforms compared: source note ucaas-platform-comparison-surv-needs-local-pstn. WarmTransfer. https://warmtransfer.net/knowledge/claims/ucaas-platform-comparison-surv-needs-local-pstn
BibTeX
@misc{warmtransfer-claim-ucaas-platform-comparison-surv-needs-local-pstn,
title = {UCaaS platforms compared: source note ucaas-platform-comparison-surv-needs-local-pstn},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ucaas-platform-comparison-surv-needs-local-pstn},
note = {Source note ucaas-platform-comparison-surv-needs-local-pstn, checked 2026-09-30}
}