Mixmonitor() ---The recording is out of sync

According to the log shows that the other party’s RTP stream must have been issued comfort noise, our asterisk does not support this feature, it will cause the recording of non synchronization problems.
Our record sync logic is not afraid of packet loss. However, mute suppression is not supported. We notify each other in accordance with the agreement, but it seems that the other party does not meet the specifications and continues to mute the sdp.
Please tell me how to solve the problem.Thanks.
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