Source note · SIP TLS handshake failures on trunks
Microsoft said that during its 30 June 2026 staged CA validation test, an SBC failing to establish outbound TLS connections or rejecting inbound ones indicated trust problems with the new certificate.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- trust store
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- test starting 2026-06-30 09:00 UTC, 2-4 days, staged by geo
- Checked
- 2026-09-25
Sources
- What's New Direct Routing — Microsoft · tier 2 current vendor documentation · Validation test that switches Microsoft Teams Direct Routing SIP endpoints to certificates issued by a new CA (June 30, 2026), third bullet
Cite this note
APA
WarmTransfer. (2026, September 25). SIP TLS handshake failures on trunks: source note sip-tls-handshake-failures-dr-ca-test-symptom. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-tls-handshake-failures-dr-ca-test-symptom
BibTeX
@misc{warmtransfer-claim-sip-tls-handshake-failures-dr-ca-test-symptom,
title = {SIP TLS handshake failures on trunks: source note sip-tls-handshake-failures-dr-ca-test-symptom},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-tls-handshake-failures-dr-ca-test-symptom},
note = {Source note sip-tls-handshake-failures-dr-ca-test-symptom, checked 2026-09-25}
}