A western Sydney man who inadvertently livestreamed himself allegedly assaulting his pregnant partner during a game of Fortnite has dismissed it as a "one-off thing", as Telstra confirmed it had suspended him from his role as an engineer.

Luke Munday, 26, was charged with common assault on Sunday evening after watchers of the livestream, that allegedly captured Mr Munday hitting his partner as she cried, rang police.

The confronting video, which police have confirmed they will use as evidence against Mr Munday, depicts the gaming enthusiast allegedly yelling at his partner, then hitting her.

"You f---ing woman basher," the woman screamed after he allegedly hit her.