Source note · Troubleshooting Teams Direct Routing
Microsoft response code 531027 with SIP 488 ('There are no ICE candidates in the SDP') means media bypass failed because the SBC's SDP had no ICE candidates. Microsoft's fix is to enable ICE Lite on the SBC.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone Direct Routing
- Subsystem
- media-bypass
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- SIP 488 and Microsoft response codes - Microsoft Teams — Microsoft · tier 2 current vendor documentation · 531027 488 There are no ICE candidates in the SDP. Non-ice endpoints cannot use bypass
Cite this note
APA
WarmTransfer. (2026, September 25). Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-488-ice-lite. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-488-ice-lite
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-troubleshooting-488-ice-lite,
title = {Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-488-ice-lite},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-488-ice-lite},
note = {Source note teams-direct-routing-troubleshooting-488-ice-lite, checked 2026-09-25}
}