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SIP response code 503

  • Article
  • Applies to:
    Microsoft Teams

This article provides troubleshooting information for various combinations of the SIP 503 error and Microsoft response codes.

10320 503 Bot is unreachable or unable to answer before timeout

  • Microsoft response code: 10320
  • SIP response code: 503
  • Suggested actions:
    • If the bot is provided by Microsoft, such as the built-in call recording, contact Microsoft Support.
    • If the bot is your own bot or from a third-party provider, work with the bot provider to verify that the bot is set up correctly.

560503 503 Service unavailable. SBC undergoing maintenance or temporarily overloaded

  • Microsoft response code: 560503
  • SIP response code: 503
  • Suggested actions:
    • Check the logs on the SBC to investigate why it returns the "503" SIP response.
    • Make sure that the SBC is correctly licensed to handle the number of concurrent sessions.
    • Determine whether the "503" error is related to a specific destination country/region or calling corridor.