Source note · SIP trunk carrier turn-up and acceptance testing
When routing a call, Direct Routing treats an SBC as healthy if it has sent OPTIONS within the last three minutes; otherwise the SBC is demoted, not removed, and is tried again before the call fails.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- failover
- 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 SBCs using SIP options messages
Cite this note
APA
WarmTransfer. (2026, September 25). SIP trunk carrier turn-up and acceptance testing: source note sip-trunk-carrier-turn-up-dr-health-3min. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trunk-carrier-turn-up-dr-health-3min
BibTeX
@misc{warmtransfer-claim-sip-trunk-carrier-turn-up-dr-health-3min,
title = {SIP trunk carrier turn-up and acceptance testing: source note sip-trunk-carrier-turn-up-dr-health-3min},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trunk-carrier-turn-up-dr-health-3min},
note = {Source note sip-trunk-carrier-turn-up-dr-health-3min, checked 2026-09-25}
}