
Click Settings, then select Calls From iPhone. On Mac, open the FaceTime app, then choose FaceTime > Preferences.On iPad or iPod touch, go to Settings > FaceTime, then turn on Calls from iPhone.
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On iPhone, go to Settings > Phone > Calls on Other Devices, then turn on Allow Calls on Other Devices.Each device is connected to the same network using Wi-Fi or Ethernet.Each device is signed in to FaceTime with the same Apple ID.Each device is signed in to iCloud with the same Apple ID.It works when your devices are near each other and set up as follows: Use iPhone Cellular Calls with any Mac, iPhone, iPad, or iPod touch that meets the Continuity system requirements. With the iPhone Cellular Calls feature, you can make and receive calls from your Mac, iPad, or iPod touch when those devices are on the same network as your iPhone. Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

Are you using FaceTime to make the calls?
