Source note · SIP trunk redundancy and failover design
Direct Routing considers an SBC healthy if it sent SIP OPTIONS within the last three minutes (three times the one-minute regular interval) at the moment a call is routed.
Checked 2026-09-25
If options were sent during the last three minutes, the SBC is considered healthy.
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SBC health monitoring
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Monitor Direct Routing — Microsoft · tier 2 current vendor documentation · Monitoring availability of Session Border Controllers using SIP options messages
Cite this note
APA
WarmTransfer. (2026, September 25). SIP trunk redundancy and failover design: source note sip-trunk-redundancy-design-ms-options-healthy. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trunk-redundancy-design-ms-options-healthy
BibTeX
@misc{warmtransfer-claim-sip-trunk-redundancy-design-ms-options-healthy,
title = {SIP trunk redundancy and failover design: source note sip-trunk-redundancy-design-ms-options-healthy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trunk-redundancy-design-ms-options-healthy},
note = {Source note sip-trunk-redundancy-design-ms-options-healthy, checked 2026-09-25}
}