[Q] MT7-TL10 B121 build-in SIP - No Sound

Have anyone tried to use build-in SIP client aka Internet calling? In my case it works, but without any sound. It doesn't matter if it's over WiFi or mobile network, so it's not network configuration. And yes, I've tried both UDP and TCP options. Even more, build-in SIP on Samsung on the same network, with the same SIP provider and with the same Android 4.4.2 works perfectly. Third-party clients are working also, but it's not convenient.



Any thoughts?

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