The ornamental design for a decodermodemtelecommunicationdevice, as shown.
FIG. 1 is a top perspective view of a decoder modem telecommunication device in accordance with the present invention;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a rear side view thereof; and,
FIG. 7 is a right side view thereof.
The broken lines shown throughout the views that are immediately adjacent to the shaded areas, and define unshaded regions, represent the bounds of the claimed design, while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.