Take a spare handset cord and a spare USB cord, cut one end off of each, and make whatever splice you think you need. Use a very small soldering iron, rosin core solder, and slide a piece of heat-shrink tubing over one side before making the splice. Then pull the heat shrink over the splice, apply a little heat from the soldering iron, and voila.

Arthur P. Bloom
"30 years of faithful service...15 years on hold"