Here we are talking about loudspeaker on your Sonim XP5S, the ones located on both sides of the keypad.  If you find out that your phone speaker doesn't work or audio output is not clear or is distorted, you can try following steps : 

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 items 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 practice for both the speakers and if the issue seems to be isolated to either of the speakers, your device may need service. Please contact Sonim Support Team if that is the case.
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 up 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 > Profiles > highlight 'Standard' > Press 'Options key' > Edit > Phone Ringtone, and make sure that the ringtone is not set to 'None'. Same setting goes for all alert tones under Profile Settings, make sure 'none ' is not selected under alert tones.

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 audio issues with your Sonim XP5S mic, that is, the other party on call with you is reporting trouble with the incoming audio, try following :

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, audio issues on calls are inevitable since there are several network related factors inducing fluctuations and hence causing audio disruptions on an active call.
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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Earpiece/ receiver is the piece of equipment right above the screen on your Sonim XP5S, which you get the audio from while on a call. If you are having issues with your phone's earpiece/ receiver, try following : 

1. Check to see if call volume is enough to be heard, to increase volume press volume up keys while on a call.
2. Try checking if there is any dust/ debris settled on the receiver opening. If there are foreign particles blocking the opening, the audio would not be clearly audible. If that is the case, try cleaning it very carefully. If you are not able to, contact Sonim Technical Support to avail service options.
3. If above is not the case. Try finding out if this issue is happening while on call with specific person/ phone number.  If it is so, there are chances that the issue lies on the other party's phone mic or something related to network. Merely switching to speakers from receiver while on a call, you would be able to know whether the issue is originating from somewhere else other than the device receiver itself.
4. If you are facing audio issues with earpiece on every single call, the issue is isolated to your Phone/ Network. Check to see if you are getting proper network signals. If you have network strength stable and you are still facing this issue. It further narrows down to your device.
5. Restart the device.
6. Back up device data and perform Factory reset from Settings > Factory reset > reset. (This erases everything on the phone)

Still facing issues? Contact Sonim Technical Support.

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You need to use the audio headset jack connector onto your XP5s.

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 jack connector from your XP5s and re-connect it.
• Try restarting the XP5s and check if the issue persist.
• 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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