Answer: tieline

AnswerCrossword Clue
TIELINE

Phone-system connection

TIELINE

Phone channel

TIELINE

Private link

TIELINE
Phone link
TIELINE
Telecomunications link
TIELINEPrivate phone channel between offices
TIELINESurveyor's string.
TIELINEType of telephone hookup.
TIELINESurveying aid
TIELINEPrivate telephone channel
TIELINEPhone feature