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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Loopback/NvRL5LTG">Loopback</a></li> <li><a href="/facts/Conference_call/fk2BI3Se">Conference call</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Spew Radio Inc. "Telephone "Loop Lines"". Archived from the original on 18 April 2023. <a href="https://web.archive.org/web/20230418202921/http://home.ptd.net/~n3cvj/looplines.htm" target="_blank">https://web.archive.org/web/20230418202921/http://home.ptd.net/~n3cvj/looplines.htm</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Ron Rosenbaum, Secrets of the Little Blue Box Retrieved December 24, 2012. <a href="http://www.lospadres.info/thorg/lbb.html" target="_blank">http://www.lospadres.info/thorg/lbb.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>