{"id":927,"date":"2015-11-22T16:14:51","date_gmt":"2015-11-22T15:14:51","guid":{"rendered":"https:\/\/bergs.biz\/blog\/?p=927"},"modified":"2017-11-01T10:07:47","modified_gmt":"2017-11-01T09:07:47","slug":"brother-mfc-7840w-internet-fax-uber-dus-net","status":"publish","type":"post","link":"https:\/\/bergs.biz\/blog\/2015\/11\/22\/brother-mfc-7840w-internet-fax-uber-dus-net\/","title":{"rendered":"Brother MFC-7840w &#8220;Internet Fax&#8221; \u00fcber DUS.net"},"content":{"rendered":"<p>Seit einigen Tagen habe ich einen &#8220;IP-only&#8221;-Telefonanschluss, so dass ich nicht mehr wie bisher mit meinem <a href=\"http:\/\/amzn.to\/2zWljc5\" target=\"_blank\">Brother MFC-7840w<\/a>-Multifunktionsger\u00e4t \u00fcber einen a\/b-Terminaladapter an einem ISDN-Anschluss faxen kann.<\/p>\n<p>Beim Suchen nach Alternativen stie\u00df ich auf <a href=\"http:\/\/wiki.ip-phone-forum.de\/fax:brother:fax-to-server\" target=\"_blank\">dieses Wiki<\/a> im <a href=\"http:\/\/www.ip-phone-forum.de\/\" target=\"_blank\">IP-Phone-Forum<\/a>, welches mir sehr weiter geholfen hat.<\/p>\n<p>Zun\u00e4chst musste ich ein Firmware-Update f\u00fcr mein Faxger\u00e4t flashen, was die ben\u00f6tigte Internet-Fax-Funktionalit\u00e4t\u00a0 (<a href=\"https:\/\/de.wikipedia.org\/wiki\/T.37\" target=\"_blank\">T.37-Protokoll<\/a>) implementiert.<\/p>\n<p>Weiterhin musste ein Anbieter gefunden werden, der dieses Protokoll unterst\u00fctzt. <a href=\"https:\/\/dus.net\/\" target=\"_blank\">DUS.net<\/a>, welches auch im obigen Wiki erw\u00e4hnt wird, war mir ohnehin schon bekannt, weil ich auf der Suche nach einem guten SIP-Provider bin. Also wollte ich gerne <a href=\"https:\/\/dus.net\/\" target=\"_blank\">DUS.net<\/a> als Fax-Provider nutzen, jedoch gibt es da ein prinzipielles Problem:<\/p>\n<blockquote><p>Um das Dus.net mail2fax Gateway anzusprechen, m\u00fcssen Zugangsdaten &gt; 50 Zeichen im Betreff-Feld \u00fcbertragen werden. Die Brother-Firmware (4.0) speichert aber nur 41 Zeichen ab.<\/p><\/blockquote>\n<p>Meine L\u00f6sung sieht nun so aus:<!--more--><\/p>\n<p>Der Drucker sendet die Mail mit dem TIFF-G3-Scan nicht direkt an DUS.net, sondern an meinen internen Mailserver (Exim 4). Das ist ohnehin besser, weil der Drucker kein verschl\u00fcsseltes SMTP zum Einliefern der Mail beherrscht. \ud83d\ude41<\/p>\n<p>Auf meinem internen Mailserver \u00e4ndere ich dann die Mail derart, dass das Subject ge\u00e4ndert wird. Im Drucker habe ich lediglich als Subject meine Kundennummer definiert, der Mailserver schreibt das dann so um, dass auch das Authentication Token eingef\u00fcgt wird, welches man im Kundenbereich von DUS.net einsehen kann.<\/p>\n<p>Die Realisierung dessen ist sehr einfach. Ich habe die Exim-Config um folgendes Snippet erweitert, um einen System Filter definieren zu k\u00f6nnen:<\/p>\n<pre>system_filter = \/etc\/exim4\/system_filter\r\nsystem_filter_user = Debian-exim\r\nsystem_filter_group = Debian-exim\r\nsystem_filter_file_transport = address_file\r\nsystem_filter_pipe_transport = address_pipe<\/pre>\n<p>Der System Filter sieht dann so aus:<\/p>\n<pre># Exim filter\r\n\r\n# Only run this on the first pass through the filter\r\nif not first_delivery then\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 finish\r\nendif\r\n\r\n# Trap any errors\r\nif error_message then\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 finish\r\nendif\r\n\r\n# Modify the subject header to only include the comments section for all JIRA emails.\r\nif $recipients ends \"@fax.dus.net\" and $header_subject: matches \\N^USERID$\\N\r\nthen\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 headers remove \"Subject\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 headers add \"Subject: USERID:*AuthToken\"\r\nendif<\/pre>\n<p>Et voil\u00e0!<\/p>\n<p>Ein Testfax ging auf Anhieb ordnungsgem\u00e4\u00df raus&#8230;<\/p>\n<p>Wem das hilft, der schreibe mir doch gerne eine kurze Nachricht hier im Blog&#8230;<\/p>\n<h4>Update 27.11.2015:<\/h4>\n<p>Ich bin letzten Endes doch zu einem anderen Anbieter gegangen, <a href=\"https:\/\/simple-fax.de\/\" target=\"_blank\">SimpleFax<\/a>. Dieser bietet ebenfalls T.37, allerdings funktioniert die Authentifizierung an Hand von E-Mail-Adressen auf einer Whitelist. Die oben beschriebene Manipulation des Subjects ist daher bei SimpleFax nicht erforderlich.<\/p>\n<p>Der Grund f\u00fcr den &#8220;Wechsel&#8221; war, dass der Seitenpreis bei SimpleFax lediglich 7 ct betr\u00e4gt, w\u00e4hrend er bei DUS.net 15 ct betr\u00e4gt. Das allein w\u00e4re wahrscheinlich noch nicht ausschlaggebend gewesen, aber das Web-Interface von SimpleFax hat den gro\u00dfen Vorteil, dass auch die gesendeten Faxseiten selbst im Sendelog zu sehen sind, w\u00e4hrend bei DUS.net nur die &#8220;Metadaten&#8221; angezeigt werden (Datum\/Uhrzeit, Rufnummer).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Wie man mit Hilfe eines eigenen Mailservers mit einem Brother MFC-7840w &#8220;Internet Fax&#8221; \u00fcber DUS.net senden kann.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[58,4,12,84],"tags":[163,221],"class_list":["post-927","post","type-post","status-publish","format-standard","hentry","category-communications","category-computers","category-deutsch","category-networking-computers","tag-fax","tag-t-37"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Brother MFC-7840w &quot;Internet Fax&quot; 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