{{Short description|Telecomms circuit between exchanges}} A '''tie line,''' also known as a '''tie trunk''', is a telecommunication circuit between two telephone exchanges or two extensions of a private telephone system.<ref>{{Citation | author = Atis | title = Tie Trunk | url = http://www.atis.org/glossary/definition.aspx?id=848 | accessdate = 2015-06-08 }}</ref><ref>{{Citation | first = American Heritage Dictionary | last = YourDictionary.com | title = YourDictionary.com: Tie Line | url = http://www.yourdictionary.com/tie-line#americanheritage | accessdate = 2015-06-07 | archiveurl = https://web.archive.org/web/20070620202920/http://www.yourdictionary.com/ahd/t/t0208400.html | archivedate = 2007-06-20 }}</ref>
==See also== *Private branch exchange *Circuit ID *Leased line *Private line
==References== {{Reflist}}
Category:Communication circuits
{{Telephony-stub}}