In Teams Direct Routing, Microsoft response code 1106 with SIP 408 means the callee answered but the SBC did not acknowledge Microsoft's 200 OK in the allotted time.
Checked 2026-10-02
- Vendor
- Microsoft
- Product
- Teams Direct Routing
- Subsystem
- call signalling
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- SIP 408 and Microsoft response codes - Microsoft Teams — Microsoft · tier 2 current vendor documentation · Section '1106 408 An acknowledgement was not received for the call acceptance in the allotted time'
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-1106-no-ack-of-200. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-408-timeout-troubleshooting-ms-1106-no-ack-of-200
BibTeX
@misc{warmtransfer-claim-sip-408-timeout-troubleshooting-ms-1106-no-ack-of-200,
title = {Troubleshooting SIP 408 Request Timeout and calls that get no response: source note sip-408-timeout-troubleshooting-ms-1106-no-ack-of-200},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-408-timeout-troubleshooting-ms-1106-no-ack-of-200},
note = {Source note sip-408-timeout-troubleshooting-ms-1106-no-ack-of-200, checked 2026-10-02}
}