Outbound calls blocked or tagged as spam

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When making outbound calls from Zoom Phone, your call may be blocked or tagged as spam by the receiving party's phone service or carrier. Follow this article for general suggestions to help ensure your calls are not being blocked or tagged as spam.

This article covers:

Reasons why calls from your Zoom Phone number are being blocked or tagged as spam

In an effort to protect consumers against abusive robocalls, carriers are increasingly implementing call blocking programs.

For example, in the United States, AT&T, Verizon and T-Mobile are blocking calls and tagging calls as spam that they feel are following robocalling characteristics such as high-volume, short-duration calls originating from a single number.

Here are other possible reasons your call is being blocked

  • The receiving party is using a third-party database service that's blocking your call; for example, Nomorobo.
  • The receiving party is using a third-party phone service with filters or rules that's blocking your number; for example, they might be blocking all callers with a certain number prefix.

How to ensure calls from your Zoom Phone number are allowed by wireless carriers

To ensure your outbound calls aren't categorized as unwanted or fraudulent calls by the wireless carriers, you can proactively request your outbound caller ID number to be allowed.

For example, if you use your Zoom Phone phone number to make frequent, short outbound calls to remind clients of appointments, these may be categorized as fraudulent calls by wireless carriers.

If you know the carrier of your receiving party, you can contact their carrier to allow your phone number. You can also check if the receiving party is using a robocall database service like Nomorobo. Contact the third-party service to allow your phone number.

Here are some common US carrier and robocall database services you can contact:

US carriers

Robocall database services

Analytics providers

Additional troubleshooting

If you have further questions or concerns, submit a request to Zoom Support with at least three separate and detailed call examples where outbound calling was flagged as potential spam. Please include the details below for each call example:

  • Call from:
  • Call to:
  • Date: 
  • Time (with timezone):

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