Prevent phone numbers from being flagged as spam - Microsoft Learn

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1. “When phone numbers are flagged as spam, it can limit the ability of businesses to communicate with their customers.” Blocked Calls: Outbound calls may be blocked, preventing important communications.

   In Caller ID reputation and spam labeling

2. Requirements and best practices for voice communications “Regularly monitor call patterns to identify any unusual activity that may trigger spam filters.” Use Caller ID: Ensure that the customer’s caller ID is correctly set up and displays accurate information. This practice helps recipients recognize the caller and reduces the likelihood of being reported as spam. You can apply the Azure Communication process for Caller Name Delivery (CNAM) set up in Define your caller identity.

   In Caller ID reputation and spam labeling

3. Placing calls in unusual calling patterns inconsistent with normal, individual subscription use. For example, placing regular calls of short durations or calls to multiple numbers in a short period of time. “Using Communications Services in violation of any applicable laws or regulations of any jurisdiction, including, but not limited to: (a) privacy or data protection laws or regulations; (b) laws requiring consent of participants to receive calls or text messages; (c) laws governing the recording or monitoring of telephone calls; (d) laws and regulations that prohibit unsolicited, unwanted or harassing communications; or (e) anti-spam laws such as the U.S. CAN SPAM Act of 2003 and the Do-Not-Call Implementation Act.” For the full list of applicable Azure Communication Services Terms, see Service Specific Terms and Communications Services Tax Rates and Terms.

   In Compliance

4. Provide Opt-Out Options: Offer recipients an easy way to opt-out of receiving calls. This action can be done through automated systems or customer service representatives. “This practice reduces the chances of calling numbers that may report customer’s calls as spam.” Prohibited uses of communications services

   In Data hygiene

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