Rtcp halted Operation not permitted

Hi, i get like 10 of this error everyday and not sure what it means, it happens when i answer the call. I have freepbx15 and asterisk 16.15.0
res_rtp_asterisk.c: RTCP SR transmission error to x.x.x.x:13577, rtcp halted Operation not permitted

please check with the port and nat:

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