Source note · UC and CCaaS security certifications
A C5 attestation always refers to a completed past period, which under ISAE 3000 covers 3 to 12 months; it carries no forward validity date.
Checked 2026-10-02
- Vendor
- BSI
- Product
- C5
- Subsystem
- report period
- Deployment
- multi-tenant
- Region
- de
- Release range
- C5:2020 and C5:2026
- Checked
- 2026-10-02
Sources
- C5 - FAQ — Bundesamt fuer Sicherheit in der Informationstechnik (BSI) · tier 1 standards and regulators · FAQ 'How long is a C5 attestation valid for?'
Cite this note
APA
WarmTransfer. (2026, October 2). UC and CCaaS security certifications: source note ucaas-compliance-certifications-c5-retrospective-period. WarmTransfer. https://warmtransfer.net/knowledge/claims/ucaas-compliance-certifications-c5-retrospective-period
BibTeX
@misc{warmtransfer-claim-ucaas-compliance-certifications-c5-retrospective-period,
title = {UC and CCaaS security certifications: source note ucaas-compliance-certifications-c5-retrospective-period},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ucaas-compliance-certifications-c5-retrospective-period},
note = {Source note ucaas-compliance-certifications-c5-retrospective-period, checked 2026-10-02}
}