NB! It seems this console command is not compatible with CS2.
Command Profile

VOICE_MUTE

CS:GO

This command mutes the user with the specified ID. Find the ID of a user with the voice_show_mute command.

Syntax
voice_mute [Player #]

Description

This command mutes the user with the specified ID. Find the ID of a user with the voice_show_mute command.

Syntax And Arguments

voice_mute [Player #]
Player # The player # of the user you wish to mute, find player numbers by typing "voice_show_mute" (without quotes) into the console.

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Related Commands

voice_unmute

This command unmutes a player who you have previously muted with the voite_mute command. Use voice_reset_mutelist to reset all mutes.

voice_enable

This command sets whether or not voice communication is enabled for your client. Setting this to 0 will disable voice. Default is 1 (enabled).

voice_scale

This command sets the volume of voice communications (i.e. how loud all other players microphones are). Default is 1 (loudest), 0 would mute, 0.5 would be 50% volume.

voice_forcemicrecord

This command, if set to 0, will make CS:GO not use your operating system's device set as the default microphone device.

voice_loopback

This command, if set to 1, will make your microphone playback via your speakers (i.e. you will hear your microphone). Default is 0 (disabled). Usually there is a little delay, this is normal.

voice_threshold

This command sets the volume theshold at which your microphone will be enabled if you are using voice activation. In other words, when your microphone is louder than this value, it will be transmitted in-game.

voice_show_mute

This command prints a list of players (with their player #s) who can be muted.

voice_caster_enable

This command sets whether or not voice casting is enabled, and if so, the account number of the user who is casting. We assume (untested) that the account number is the 3 ID of the caster without the STEAM_0:1 part of the ID. Format is usually STEAM_0:1:#####.