Unable to make outbound calls to a number: "Not Found" error message

When you are unable to make outbound calls to an outbound number and keep getting a "Not Found" response and call drops. Also, in the VoIP Monitor, it shows the call being "rejected by Call Protect."

This is why it happens and how to prevent it from happening in the future: 

 The "Call Protect" is the term end-carrier (the carrier/phone company that provides the phone service to the number you are dialing out to) blocking the number because they are seeing it as SPAM (any kind of unwanted or unsolicited form of digital communication).

In order to ensure your outbound calls are not miscategorized as unwanted or fraudulent calls by the wireless carriers, we highly encourage you to proactively request authorization of legitimate outbound calling use cases from each of the major wireless carriers.
 
Below are websites where you can submit whitelisting requests:

• https://www.freecallerregistry.com/fcr/
• T-Mobile: https://firstorion.com/register-your-number/
• Verizon: https://www.voicespamfeedback.com/vsf/ or https://reportarobocall.com/trf/
• AT&T: https://www.att.com/reviewmycalllabel

Please note that calls typically pass through multiple carriers before reaching the recipient. In some cases, carriers or mobile applications may incorrectly label legitimate business calls as “Spam Likely,” “Scam,” or “Telemarketer.” This can happen when their systems detect patterns such as a high volume of short-duration calls, unanswered calls, or sudden spikes in outbound call activity.

If you’re opening a ticket with our Support Team for further assistance, please include the following information:

• Date and time of the call (including time zone)
• Phone number or extension the call was made from
• Phone number or extension the call was made to
• Device used (desk phone or softphone application)
• Detailed description of the issue (please include as much detail as possible)

Once they receive this information, our team will review the call details to help identify where the calls may be getting flagged or rejected and guide you through the next steps.