Linkus external call voice only after pressing and cancel Hold or Transfer button!

I encountered such a problem. With an external call using a Linkus there is no voice (sound), but the call goes through.
The problem was solved randomly. After dialing the external number and once the connection has occurred, you need to press and cancel the Hold or Transfer button, then there is a sound (voice).
This problem appeared after the firmware update.
Internal calls work fine.


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