Unable to hear other person speaking during call on my iPhone 11

Please try this

Follow these steps

1. Turn off Silent mode:

• If your device has a Ring/Silent switch, move the switch forward — toward the device's display — so that orange isn't showing. If you're using an iPhone with an Action button or an iPad, you can also swipe down from the top-right corner to open Control Center and make sure that Silent mode is off. Learn how to access Control center on your iPhone or your iPad.
  • If your iPhone has an Action button and it's set to Silent mode, press it. You can also change the feature that the Action button controls.

1. Open Settings > Focus > Do Not Disturb and make sure that Do Not Disturb is off.
2. Remove all screen protectors, films, or cases from your device. 
3. Check the speaker opening to see if it's blocked or dirty. On iPhone only, make sure that the receiver isn't blocked or dirty. 
4. If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.
5. Go to Settings > Sounds (or Settings > Sounds & Haptics) and drag the Ringtone and Alerts slider back and forth a few times. If you don't hear any sound, or if your speaker button on the Ringtone and Alerts slider is dimmed, your speaker might need service.
6. If you hear sound, try making a call with your iPhone and turn on speakerphone. On iPad or iPod touch, make a FaceTime call. If you still can't hear, or hear static or crackling, then your network or reception could be the issue. Try to call again later, or from a different location.

Get service

If your device still has sound issues, you might need service. Get service.

ampowell234 ~ As your iPhone 11 could be nearly 6 years old, it's worth checking for a weak, aging battery which can cause such issues. So...

Does your iPhone 11 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Try restarting your iPhone and also make sure that your AirPods, Bluetooth, and speaker settings are all functioning properly to troubleshoot the issue.