How to extend Huawei's call ringing for 30 seconds?

1. Turn on Huawei's mobile phone and enter the settings.

2. Look for sound and vibration options, and then click enter options.

3. In the sound and vibration interface, find the ringtone settings and click Enter.

4. In the ringtone interface, you can choose the default ringtone or add custom music as a new ringtone. Choose a long piece of music as the alert tone you want to hear in a long ringing time.

5. After confirming the settings, exit the settings interface.