Source note · Troubleshooting Teams Direct Routing
Another cause of an intermittently inactive SBC is a root or intermediate certificate on the SBC that isn't part of the SBC certificate's issuer chain. The Teams service can't validate the chain and resets the connection. The fix is to install the correct intermediate and root on the SBC.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone Direct Routing
- Subsystem
- tls-certificates
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- SBC connectivity issues — Microsoft · tier 2 current vendor documentation · SIP options issues > SBC status is intermittently inactive, second bullet
Cite this note
APA
WarmTransfer. (2026, September 25). Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-intermit-chain. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-intermit-chain
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-troubleshooting-intermit-chain,
title = {Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-intermit-chain},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-intermit-chain},
note = {Source note teams-direct-routing-troubleshooting-intermit-chain, checked 2026-09-25}
}