<p>The Department is in discussions with stakeholders across Government and industry to arrive at a standard definition of vulnerability specific to the Public Switched Telephone Network (PSTN) migration. This will help identify customers that may be vulnerable during the migration, whether through health or personal circumstances, so that they can be better protected.</p><p> </p><p>While agreeing a definition is a priority, it is critical that the final definition is robust and properly tested. The Department is working at pace to do so and will publish a definition as soon as possible.</p>