Source note · SIP trunk redundancy and failover design
In Direct Routing, SBCs inside one voice route are tried in random order, and if none in the higher-priority route is available, the next lower-priority route matching the same pattern is tried; if no SBC is available the call is dropped.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- call routing
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Configure call routing for Direct Routing — Microsoft · tier 2 current vendor documentation · Example 1: Voice routing with one PSTN usage, Call Flow 2 and following note
Cite this note
APA
WarmTransfer. (2026, September 25). SIP trunk redundancy and failover design: source note sip-trunk-redundancy-design-ms-route-priority-backup. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trunk-redundancy-design-ms-route-priority-backup
BibTeX
@misc{warmtransfer-claim-sip-trunk-redundancy-design-ms-route-priority-backup,
title = {SIP trunk redundancy and failover design: source note sip-trunk-redundancy-design-ms-route-priority-backup},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trunk-redundancy-design-ms-route-priority-backup},
note = {Source note sip-trunk-redundancy-design-ms-route-priority-backup, checked 2026-09-25}
}