RTP authentication error on iOS device

Hello, I'm using the sample native iOS phono app VisIVR (based on GitHub) on real device. When the call is setup there's no voice heard on the line. It looks like a problem in RTP connection setup. During the call I keep getting these messages in the log: "srtp_unprotect error was authentication failure" I keep on investigating this problem, but it would be helpful if you can point me in the right direction. I attach a short log file. Thanks, Efim


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