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

VOICE_UNMUTE

CS:GO

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

Syntax
voice_unmute [Player #]

Description

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

How To Use voice_unmute

  1. Enable the developer console in Counter-Strike settings.
  2. Open the console with the tilde key (~).
  3. Enter voice_unmute [Player #], replacing bracketed arguments with the value you want, then press Enter.

This legacy command is not currently listed as compatible with Counter-Strike 2.

Syntax And Arguments

voice_unmute [Player #]
Player # The player number of the user you wish to unmute. Find player numbers with the voice_show_mute command.