Teams Direct Routing retries an outbound call on another SBC in the route for SIP final responses listed in FailoverResponseCodes, whose default values are 408, 503 and 504.
Checked 2026-10-02
Default values: 408, 503, 504
- Vendor
- Microsoft
- Product
- Teams Direct Routing
- Subsystem
- outbound routing
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Trunk failover on outbound calls - Microsoft Teams — Microsoft · tier 2 current vendor documentation · Section 'Failover of specific SIP codes received from the Session Border Controller (SBC)'
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting SIP 408 Request Timeout and calls that get no response: source note sip-408-timeout-troubleshooting-ms-failover-codes-default. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-408-timeout-troubleshooting-ms-failover-codes-default
BibTeX
@misc{warmtransfer-claim-sip-408-timeout-troubleshooting-ms-failover-codes-default,
title = {Troubleshooting SIP 408 Request Timeout and calls that get no response: source note sip-408-timeout-troubleshooting-ms-failover-codes-default},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-408-timeout-troubleshooting-ms-failover-codes-default},
note = {Source note sip-408-timeout-troubleshooting-ms-failover-codes-default, checked 2026-10-02}
}