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SIP error code 403 troubleshooting

If a 403 error is sent by the VoIP provider, it means that they are understanding your registration or call request but refuse to fulfil it.  This could be for a number of reasons including:

  • Incorrect username or password
  • The number being called is not supported or you are not dialling the number correctly
  • Lack of funds in the account
  • You will need to reach out to the VoIP service provider to see why they are sending this error.
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