curl --request GET \
  --url https://your-instance.example.com/api/calls/user/phone-numbers \
  --header 'Authorization: Bearer <token>'

{
  "phoneNumbers": [
    {
      "provider": "sinch",
      "phoneNumber": "+14165550100",
      "isDefault": true,
      "isInboundEnabled": true,
      "aiEnabled": false
    }
  ]
}