How can a landline unplug the one that just called?

The following is a demonstration using an Ericsson landline phone as an example.

1, first click on the fixed-line phone control interface in the query.

2. Then click up or down in the landline control panel to find the phone number you just called.

3. Finally, click on the speakerphone button and click the callback button. This is the first time you've done this, and you've successfully dialed back the number you just called.