{"id":748,"date":"2010-03-10T16:53:26","date_gmt":"2010-03-10T15:53:26","guid":{"rendered":"http:\/\/ccievoice.ksiazek.be\/?p=748"},"modified":"2025-01-11T18:28:02","modified_gmt":"2025-01-11T17:28:02","slug":"network-address-translation-nat","status":"publish","type":"post","link":"https:\/\/collaboration.ksiazek.be\/?p=748","title":{"rendered":"Network Address Translation &#8211; NAT"},"content":{"rendered":"<p>To work correctly with your voice flows, a NAT device must inspect Layer3 and Layer4 protocol\u00a0,port information and sometimes the embedded payload.<\/p>\n<p>Cisco IOS NAT ALG can support the following voip protocols\u00a0:<\/p>\n<blockquote>\n<ul>\n<li>H323v2<\/li>\n<li>H225<\/li>\n<li>H245<\/li>\n<li>RAS<\/li>\n<li>SIP<\/li>\n<li>SCCP<\/li>\n<\/ul>\n<\/blockquote>\n<p>So if you change the default port number of these protocols, then you have to change it also in the configuration with the following command <strong><em><span style=\"color: #ff0000;\">ip nat service &lt;&lt;protocol&gt;&gt; tcp port &lt;&lt;port-number&gt;&gt;<\/span><\/em><\/strong>.<\/p>\n<p>Pay attention also that NAT doesn&#8217;t support voice signaling encryption<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To work correctly with your voice flows, a NAT device must inspect Layer3 and Layer4 protocol\u00a0,port information and sometimes the embedded payload. Cisco IOS NAT ALG can support the following voip protocols\u00a0: H323v2 H225 H245 RAS SIP SCCP So if you change the default port number of these protocols, then you have to change it [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1,24,33],"tags":[59,289,111],"class_list":["post-748","post","type-post","status-publish","format-standard","hentry","category-non-classe","category-uncategorized","category-written-theory","tag-ccie-voice-written","tag-nat","tag-security"],"_links":{"self":[{"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=\/wp\/v2\/posts\/748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=748"}],"version-history":[{"count":1,"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=\/wp\/v2\/posts\/748\/revisions"}],"predecessor-version":[{"id":4360,"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=\/wp\/v2\/posts\/748\/revisions\/4360"}],"wp:attachment":[{"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/collaboration.ksiazek.be\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}