The ornamental design for a telephonehandsetfilter, as shown and described.
FIG. 1 is a perspective view of a telephone handset filter showing my new
design, the fragmentary broken line showing of a telephone handset being
for illustrative purposes only;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom perspective view thereof;
FIG. 4 is a front view thereof, the rear view being the same; and,
FIG. 5 is a right side view thereof, the left side being the same.