Source note · Troubleshooting Teams Direct Routing
Microsoft response code 531052 with SIP 488 ('Cannot negotiate a new modality with blackhole media') means the SBC sent SDP with connection address 0.0.0.0, which the Microsoft SIP stack doesn't support.
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 488 and Microsoft response codes - Microsoft Teams — Microsoft · tier 2 current vendor documentation · 531052 488 Cannot negotiate a new modality with blackhole media
Cite this note
APA
WarmTransfer. (2026, September 25). Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-488-blackhole. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-488-blackhole
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-troubleshooting-488-blackhole,
title = {Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-488-blackhole},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-488-blackhole},
note = {Source note teams-direct-routing-troubleshooting-488-blackhole, checked 2026-09-25}
}