No not that kind of mute there's a setting on messages were it allows you to mute a contact so you will not receive any notification are calls of this certain number you mute but now I don't know how to unmute the contact as it does not have an option on the same page I went on to turn the mute contact on in the first place

When on a call, check the screen, do you see a microphone icon? If yes, tap it.