tie line

noun Telecommunications.
1.
a line that connects two or more extensions in a PBX telephone system.
2.
a private telephone channel, leased from a telephone company, that connects two or more PBX systems.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tie line
 
n
a telephone line between two private branch exchanges or private exchanges that may or may not pass through a main exchange

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
They do not always indicate a boundary or corner as in the case of a tie line.
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