SIP 404 and Microsoft response codes - Microsoft Teams

Publisher

Microsoft

URL

https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/direct-routing/microsoft-sip-response-codes-404

Published

2023-10-30

Updated

unknown

Accessed

2026-10-02

HTTP status

200

License

Microsoft Learn terms (CC BY 4.0 for docs text where stated); no-redistribution; short excerpts and locators only

Source notes citing this source

• When a cloud or carrier returns 404 for a number that is provisioned, the first check is whether the Request-URI user part matches the provisioned format (typically +E.164), since documented lookups key on the Request-URI. inferred in context
• Teams Direct Routing Microsoft response code 10202 with SIP 404 means a replacement call was not found, seen in call merge and consultative transfer when the SBC retries after a failed first attempt. in context
• Teams Direct Routing Microsoft response code 511404 with SIP 404 ('Getting user info by number from RuntimeAPI failed') means the user could not be found during the reverse number lookup. in context
• For 511404, Microsoft advises making the callee number format from the SBC or PSTN trunk provider match the format assigned to the user or resource account, usually E.164 including country code. in context
• Microsoft states its SIP 404 and SIP 484 response-code guidance applies to Teams Direct Routing PSTN calls and not to Calling Plan or Operator Connect deployments. in context

Cite this source record

APA

WarmTransfer. (2023, October 30). SIP 404 and Microsoft response codes - Microsoft Teams. WarmTransfer. https://warmtransfer.net/knowledge/sources/ms-learn-dr-sip-response-codes-404

BibTeX

@misc{warmtransfer-ms-learn-dr-sip-response-codes-404,
  title  = {SIP 404 and Microsoft response codes - Microsoft Teams},
  author = {{WarmTransfer}},
  year   = {2023},
  url    = {https://warmtransfer.net/knowledge/sources/ms-learn-dr-sip-response-codes-404},
  note   = {Microsoft, accessed 2026-10-02}
}