Source note · CUCM to Teams Phone migration
The trunk failover defaults are response codes 408, 503 and 504 and a FailoverTimeSeconds of 10 seconds, after which an unanswered outbound call is routed to the next available trunk or dropped if none exists.
Checked 2026-09-21
- Vendor
- Microsoft
- Product
- Teams Phone
- Subsystem
- direct-routing-routing
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-21
- Checked
- 2026-09-21
Sources
- Connect your Session Border Controller (SBC) to Direct Routing — Microsoft · tier 2 current vendor documentation · SBC settings table, 'Failover response codes' and 'Failover times (seconds)' rows
Cite this note
APA
WarmTransfer. (2026, September 21). CUCM to Teams Phone migration: source note cucm-to-teams-phone-sbc-failover-defaults. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-to-teams-phone-sbc-failover-defaults
BibTeX
@misc{warmtransfer-claim-cucm-to-teams-phone-sbc-failover-defaults,
title = {CUCM to Teams Phone migration: source note cucm-to-teams-phone-sbc-failover-defaults},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-to-teams-phone-sbc-failover-defaults},
note = {Source note cucm-to-teams-phone-sbc-failover-defaults, checked 2026-09-21}
}