BRIEF DESCRIPTION OF THE DRAWINGS [0027]FIG. 1 is a partial side view of a vehicle of a train mounted with a telephone regulation system according to a first embodiment of the present invention. [0028]FIG. 2 is a plan view of a vehicle of a train mounted with the telephone regulation system of the first embodiment. [0029]FIGS. 3A and 3B are a plan view and a front view, respectively, of a portable