Use this article to identify and troubleshoot common errors when using Zoom Phone on the Zoom desktop client or mobile app.
Note: The error code is the last 3 digits of the code you see in the error notification. For example, if you see the error notification Call failed (code: 2202404), the error code is 404.
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Error code and details | Suggested troubleshooting |
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401, 407: The account is unauthorized. Please contact admin. 403: Your account is inactive. Please contact admin. 403: Your call can not be completed yet. Please try again later. | Contact your Zoom Phone admin for help. The admin may need to assign a Zoom Phone license or calling plan. |
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404: The number you dialed does not exist. Please try again later. | The phone number you dialed does not exist or is invalid. Double check that the number you dialed is correct. If dialing an international number, make sure to include the country code, area code, and phone number. |
| 405, 406: Your request can not be allowed. Please contact your admin. | Contact your Zoom Phone admin for help. Your admin may have removed a calling plan for outbound dialing. You may need to change your network firewall or proxy server settings. |
| 408: Request time out. Please check your network and try again later. | Contact your Zoom Phone admin for help. You may need to change your network firewall or proxy server settings. |
| 415: Media type not supported, please contact your admin and check media type. | The media type (audio codec) isn't supported. Contact your Zoom Phone admin for help. You may need to change your network firewall or proxy server settings. |
| 439, 482, 483, 502: Your service is affected by a network issue. Please check your network and try again later. | Contact your Zoom Phone admin for help. You may need to change your network firewall or proxy server settings. |
| 480, 504: The number you dialed is temporarily unavailable. Please try again later. |
The number you dialed is temporary unavailable; for example, the other party may be unavailable or declining the call. Try to call again later. |
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486: The peer is busy. Please try again later. 481, 487, 491, 504, 600, 604: The service is not available currently. Please try again later. 503: Service not available. Please try again later. |
Typically caused by server issues. Try to call again later or contact your Zoom Phone admin for help. You may need to change your network firewall or proxy server settings. |
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432, 439, 482, 483, 502, 503, 805: Your service is affected by a network issue. Please check your network and try again later. |
There was a routing error. Contact your Zoom Phone admin for help. You may need to change your network firewall or proxy server settings. |
| 500: The call number is not available currently, please check call number and try again later. |
Typically caused by server issues. Try to call again later. Also check that the number you dialed is correct. If dialing an international number, make sure to include the country code, area code, and phone number. |
| 504: The number you dialed is (not available/not online) currently, please try again later. |
There's a server error with the phone number you dial. Try to call again later. |
| 603: The peer is busy. Please try again later. |
The other call participant may have declined your call or can't answer it, and there are no alternative routes like voicemail to route the call. |
| 702: SSL Certificate failed - Cert Name mismatch |
Make sure you have the latest version of Zoom installed. |
| 703: SSL Certificate failed - Handshake failed |
Make sure you have the latest version of Zoom installed. |
| 802, 803: Emergency calling not available. |
Contact your Zoom Phone admin for help. They may need to enable emergency calling for your site. |
| 804: Network re-connection is ongoing |
Wait for the network to re-connect. |