How to MixMonitor one way

I want to use MixMonitor, but I want to get only the caller to speak.
I tried config MixMonitor(V(-4)), but the sound just reduced speaking volume.
Note: Do not use Record

You would use the ‘r’ or ‘t’ option, depending on where MixMonitor is actually started, to record the specific direction into a separate file and use post-processing to clean stuff up like deleting the main one.

Use the r() and t() options to record receive and transmit channels
separately.

https://docs.asterisk.org/Asterisk_21_Documentation/API_Documentation/Dialplan_Applications/MixMonitor

Antony.

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