Source note · SIP trunk carrier turn-up and acceptance testing
By default Direct Routing retries an outbound call on another SBC in the voice routing policy when the first SBC returns 408, 503 or 504; the list is set with the FailoverResponseCodes parameter.
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
- Trunk failover on outbound calls - Microsoft Teams — Microsoft · tier 2 current vendor documentation · Failover of specific SIP codes received from the SBC (Default values line)
Cite this note
APA
WarmTransfer. (2026, September 25). SIP trunk carrier turn-up and acceptance testing: source note sip-trunk-carrier-turn-up-dr-failover-codes. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trunk-carrier-turn-up-dr-failover-codes
BibTeX
@misc{warmtransfer-claim-sip-trunk-carrier-turn-up-dr-failover-codes,
title = {SIP trunk carrier turn-up and acceptance testing: source note sip-trunk-carrier-turn-up-dr-failover-codes},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trunk-carrier-turn-up-dr-failover-codes},
note = {Source note sip-trunk-carrier-turn-up-dr-failover-codes, checked 2026-09-25}
}