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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Point code</span></span>
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</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="Code_point" title="Code point">code point</a>.</div>
<p>An <a href="Signalling_System_No._7" title="Signalling System No. 7">SS7</a> <b>point code</b> is an address for the SS7 telephone switching system. It is similar to an <a href="IP_address" title="IP address">IP address</a> in an IP network. It is a unique address for a node (Signaling Point, or SP), used in <a href="Message_Transfer_Part" title="Message Transfer Part">MTP layer 3</a> to identify the destination of a message signal unit (MSU).
</p><p>Message contain an OPC (Originating Point Code) and a DPC (Destination Point Code); sometimes documents refer to it as a signaling point code. Depending on the network, a point code can be 24 bits (North America, China), 16 bits (Japan), or 14 bits (ITU standard, International SS7 network and most countries) in length.
</p><p><a href="ANSI" class="mw-redirect" title="ANSI">ANSI</a> point codes use 24 bits, mostly in 8-8-8 format.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="ITU" class="mw-redirect" title="ITU">ITU</a> point codes use 14 bits in 3-8-3 format.<sup id="cite_ref-:0_2-0" class="reference"><a href="#cite_note-:0-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p><p>Fourteen bit point codes can be written in multiple formats. The most common are decimal number, hexadecimal number, or 3-8-3 format (3 most significant bits, 8 middle bits, 3 least significant bits).
</p><p>Twenty-four bit point codes may be written in decimal, hexadecimal, or 8-8-8 format.
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<div class="mw-heading mw-heading2"><h2 id="Abbreviations">Abbreviations</h2></div>
<ul><li>OPC Originating Point Code</li>
<li>DPC Destination Point Code</li>
<li>ISPC International Signaling Point Code<sup id="cite_ref-:0_2-1" class="reference"><a href="#cite_note-:0-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">ANSI T1.111.4/2000, Message Transfer Part.</span>
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<li id="cite_note-:0-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.704/en/">ITU-T Recommendation Q.704</a>, Message Transfer Part.</span>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="http://jhartman.pl/pc/">Web-based PointCode converter</a></li>
<li><a rel="nofollow" class="external text" href="https://tools.valid8.com/#ss7">SS7 Point Code Converter by Valid8.com</a></li></ul>
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