Source note · Troubleshooting Teams Direct Routing
Microsoft response code 560503 with SIP 503 means the SBC itself returned 503 (maintenance or overload). Microsoft says to check the SBC logs, check that the SBC is licensed for the concurrent session count, and see whether the failures cluster on a particular destination country or calling corridor.
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 503 and Microsoft response codes - Microsoft Teams — Microsoft · tier 2 current vendor documentation · 560503 503 Service unavailable. SBC undergoing maintenance or temporarily overloaded
Cite this note
APA
WarmTransfer. (2026, September 25). Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-503-560503. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-503-560503
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-troubleshooting-503-560503,
title = {Troubleshooting Teams Direct Routing: source note teams-direct-routing-troubleshooting-503-560503},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-troubleshooting-503-560503},
note = {Source note teams-direct-routing-troubleshooting-503-560503, checked 2026-09-25}
}