We claim the ornamental design for a speakerphone, as shown and described.
FIG. 1 is a front and left side perspective view of a speakerphone showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side elevation view thereof;
FIG. 7 is a right side elevation view thereof; and,
FIG. 8 is a perspective view of thereof; the wireless phone depicted in broken lines in the cradle of the speakerphone is for environmental purposes only and forms no part of the claimed design.
The other elements depicted in broken lines in the various figures are included for environmental purposes only, and form no part of the claimed design.