telephone circuit

NOUN
17 LETTERS · STARTS WITH T

telephone circuit is a valid 17-letter word worth 25 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1E1L1E1P3H4O1N1E1C3I1R1C3U1I1T1
1 + 1 + 1 + 1 + 3 + 4 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does telephone circuit mean?