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Interconnect User Part
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<p>Interconnect User Part (IUP) is a national specific <a href="/facts/Signaling_System_7/YJ3T8VqE">Signaling System 7</a> protocol for interconnect between public <a href="/facts/Telephone_network/m46X3BJl">telephone networks</a> in the <a href="/facts/United_Kingdom/kuPAILt2">United Kingdom</a>. This protocol was formerly known as BTNUP. </p><p>It is specified in document PNO-ISC/SPEC/006 which is published by the <a href="http://www.niccstandards.org.uk/">NICC</a> as <a href="http://www.niccstandards.org.uk/files/current/nd1006_2007_05.pdf?type=pdf">ND1006:2007/05</a> <a href="https://web.archive.org/web/20140502180700/http://www.niccstandards.org.uk/files/current/nd1006_2007_05.pdf?type=pdf">Archived</a> 2014-05-02 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a>. </p>