No sound in Linphone VoIP

I use Fairphone Open OS and have no sound (video image, yes) in Linphone app calls. (I use XPrivacy, but no restrictions to that app). The same happens to Skype app.
Any solution?

It might be a network issue If you are using a SIP account on Linphone. Try not to use STUN or ICE and set up a proxy if your VoIP provider offers that option.

I use a Linphone SIP account. I have unchecked ICE, deleted the STUN server and checked outbound proxy, and no sound in my call (only have video). The other person have sound and video. I use TLS, ZRTP encryption

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