Here we are talking about loudspeaker on your Sonim XP8, the ones located on both sides of the buttons at the bottom of the screen. 

Follow the below steps mentioned if  No sound from speaker, Muffled sound or Distorted sound

1. Check to see if there is any dust or debris settled in the speaker openings. If you look carefully you should see the mesh, if you can't see the mesh,then there might be foreign item covering the speakers and hence may result in low audio volume issues/ distorted audio issues. You can try cleaning the speaker openings carefully which may fix the issue.
2. If you feel that the audio volume from speaker is not as loud as it used to be, check if both the speakers on either sides of keypad are functioning. While playing a sound/ music file try to cover one side speaker with your fingers and check if the other side is having low sound or no sound at all. Repeat this step for both the speakers and if the issue seems to be isolated to either of the speakers, your device may need service. Contact Sonim Support 
3. If you are facing an issue wherein there is no audio output from the speakers, check to see if the volume is above the minimum level by pressing volume + key on the left side of the device. If you still cannot hear any sound, try rebooting the device and check.
4. If the audio issue is specific to ringtone or alerts, Go to Settings > Sound > Phone Ringtone, and make sure that the ringtone is not set to 'None'. Same setting goes to all alert & alarm tones. Make sure the Media,Alarm & Ring volume is set to maximum.

If the issue is not resolved or is not from the above list, you can contact Sonim Technical Support for help.

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If you are facing Microphone issues with your Sonim XP8 , that is, the other party on call with you is reporting trouble with the incoming audio, try following :

Follow Below steps for help with your XP8 microphones. For example, you might sound unclear during phone calls or can't be heard on call.

With your XP8, you might experience one of these issues when you make a call, or play recorded audio/video:

• People can't hear you during a phone 
• You sound unclear to others during a phone 
• When playing back recorded audio or video, the sound you hear is unclear, or you don’t hear sound 

Note : Audio issues on calls are inevitable since there are several network related factors inducing fluctuations and hence causing audio disruptions on an active call.

1. Check network strength, if signals are weak, this could be the reason for intermittent or distorted audio(or no audio at all). However keep in mind that in some cases, 
2. Check to see if this issue is happenning on different calls(i.e. different phone numbers). A lot of cases like these involve an issue on the receiving party's phone or network. Since the issue is related to audio on a communication channel, its easy to confuse with issue on your end even when its really the other party having issues with their incoming audio(receiver/speaker problem/ network issue).
3. If issue is happening on all calls, try restarting the device. 
4. If there is no audio at all, check if the device mic is working by launching sound recorder from Menu>Application>Sound recorder and try recording. If recording works from sound recorder, please try a factory reset from Settings > Factory Reset > Reset (this will erase entire data stored on the device.)

If the issue is still unresolved, please contact Sonim Technical Support.

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If you can‘t hear a person on a call through Earpiece/Receiver

Earpiece/ receiver is the piece of equipment right above the screen on your Sonim XP8, which you get the audio from while on a call. If you are having issues with your phone's earpiece/ receiver, try the following :

Turn up the volume

• While you're on a call, adjust the volume with the volume buttons. Make sure that you can see the volume indicator on the screen when you press the volume buttons.
• Turn on the volume boost while on call 

Check the connections

If your XP8 is connected to a headset, you won't be able to hear through the XP8 receiver

Follow these steps, test after each step.

• Make sure that you don't have anything plugged into the headphone jack.
• Go to Settings > Bluetooth and turn off Bluetooth.

Clear the receiver

You can't hear through receiver if it is blocked or dirty.

Follow these steps, test after each step.

• Make sure nothing is blocking the receiver, such as a case or screen protector.
• Check the receiver opening to see if it's blocked or dirty. If necessary, clean the receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.
• While you're on a call, turn on speakerphone. If you still can't hear, then your network or reception could be the issue. Try calling again or from a different location.

Restart and update

• Restart your XP8 and test again.
• If there's still no sound or poor sound quality, update your XP8  to the latest version of OS if update is available.

If you tried these steps and there's still no sound or poor sound quality from your XP8, contact Sonim Support

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You need to use the headset jack connector onto your XP8.

In case of audio distorted or no audio from the headset , try the following : 

• Before trying the troubleshooting steps check if incase the headset connector pins are damage or if the headphones are working on a different device.
• Try using different headphones and check if the issue persist.
• Try disconnecting the headset connector from your XP8 and re-connect it and check if the issue persist.
• Try restarting the XP8 and check if the issue persist after restarting the device.
• Try using different apps for audio check (sound recorder,play music or any app where the audio works) to know if it is particular to certain apps only
• Try making multiple calls and check if the issue is on all calls or to particular number or network operator.

For further assistance contact Sonim Support.

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