Source note · Troubleshooting Teams Direct Routing
Microsoft response code 1106 with SIP 408 means the callee answered but the SBC never acknowledged Microsoft's 200 OK. Microsoft says to work with the SBC vendor to check the SIP stack and the TCP/TLS connections to the Microsoft connection points.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone Direct Routing
- Subsystem
- sip-response-codes
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- SIP 408 and Microsoft response codes - Microsoft Teams — Microsoft · tier 2 current vendor documentation · 1106 408 An acknowledgement was not received for the call acceptance in the allotted time
Cite this note
APA
WarmTransfer. (2026, September 25). Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-408-no-ack. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-408-no-ack
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-troubleshooting-408-no-ack,
title = {Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-408-no-ack},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-408-no-ack},
note = {Source note teams-direct-routing-troubleshooting-408-no-ack, checked 2026-09-25}
}