{"id":29923,"date":"2021-04-20T13:22:38","date_gmt":"2021-04-20T12:22:38","guid":{"rendered":"https:\/\/voipstudio.com\/blog\/ursachen-und-losungen-fur-voip-anrufabbruche\/"},"modified":"2025-10-10T13:07:05","modified_gmt":"2025-10-10T12:07:05","slug":"ursachen-und-loesungen-fuer-voip-anrufabbrueche","status":"publish","type":"post","link":"https:\/\/voipstudio.com\/de\/blog\/ursachen-und-loesungen-fuer-voip-anrufabbrueche\/","title":{"rendered":"Ursachen und L\u00f6sungen f\u00fcr VoIP-Anrufabbr\u00fcche"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Normalerweise werden beim Empfangen von Anrufen Telefongespr\u00e4che korrekt aufgebaut und Gespr\u00e4chspartner k\u00f6nnen miteinander problemlos kommunizieren.\u00a0<\/span>Aber, was passiert, wenn <strong>pl\u00f6tzlich<\/strong>das Gespr\u00e4chs f\u00fcr ein paar Sekunden unterbrochen wird? In der Regel etwa 30 Sekunden.<\/p>\n<h2>Was sind die Ursachen f\u00fcr den Abbruch von VoIP-Gespr\u00e4chen?<\/h2>\n<p><span style=\"font-weight: 400;\">Dies kann passieren, wenn wir <strong>Softphones oder IP-Endger\u00e4te<\/strong> <strong>mit SIP<\/strong> Session Initiation Protocol verwenden. Der Grund daf\u00fcr ist, dass gem\u00e4\u00df dem SIP-Protokoll das Telefon\/Softpnone mit einem ACK antworten muss, um anzuzeigen, dass es den eingehenden Anruf ordnungsgem\u00e4\u00df empfangen und beantwortet hat.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> Auf diese Weise wei\u00df die Call Server Unit, dass die Kommunikation l\u00e4uft. Wenn die <strong>PBX oder der Call Server diese Best\u00e4tigung<\/strong> nicht erh\u00e4lt, kann diese den Anruf nach einiger Zeit beenden.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Es gibt verschiedene Gr\u00fcnde, warum die vom SIP-Terminal an die TK-Anlage ausgegebene Best\u00e4tigungsantwort die TK-Anlage nicht zur\u00fcckerreicht. <strong>Das h\u00e4ufigste Problem<\/strong> ist, dass einige Router oder Carrier-Firewalls ein <a href=\"https:\/\/kb.intermedia.net\/Article\/3110\" target=\"_blank\" rel=\"noopener\">Feature namens &#8222;SIP ALG&#8220;<\/a> implementieren. Paradoxerweise f\u00fchrt diese &#8222;SIP ALG&#8220;-Funktionalit\u00e4t, die die NAT-Funktion in der SIP-Kommunikation verbessern soll, in vielen F\u00e4llen zum<strong> Bruch des SIP-Protokolls.<\/strong><\/span><\/p>\n<h3>Probleme durch Abbruch des SIP-Protokolls<\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\">Gespr\u00e4chsabbruch nach wenigen Sekunden.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Eingehende Anrufe, die nicht klingeln oder das Endger\u00e4t nicht erreichen.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Einweg-Audio.<\/span><\/li>\n<\/ul>\n<h2>Wie man VoIP-Anrufabbr\u00fcche l\u00f6st<\/h2>\n<p><span style=\"font-weight: 400;\">Um dieses Problem zu l\u00f6sen, w\u00e4re es am besten, <strong>das SIP ALG-Protokoll<\/strong> in diesen Routern oder Firewalls zu deaktivieren, wenn m\u00f6glich. Dazu m\u00fcssen wir in der Lage sein, diese Router zu verwalten und Sie m\u00fcssen Zugriff auf die Aktivierung oder Nichtaktivierung dieser Funktionalit\u00e4t haben. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Leider haben wir in den meisten F\u00e4llen keine Kontrolle \u00fcber diese Ger\u00e4te oder diese verf\u00fcgen <strong>nicht \u00fcber die SIP ALG-Funktionalit\u00e4t<\/strong>.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nachfolgend sind einige andere L\u00f6sungen aufgef\u00fchrt, die wir in den Endger\u00e4ten einsetzen k\u00f6nnen, um zu versuchen, dieses Problem zu \u00fcberwinden.<\/span><\/p>\n<h3>Verwenden Sie VoIPstudio-Softphones<\/h3>\n<p><span style=\"font-weight: 400;\">Zun\u00e4chst k\u00f6nnen Sie versuchen, unsere <a href=\"https:\/\/voipstudio.de\/download\/\">VoIPstudio Softphones<\/a> f\u00fcr Windows, MAC, Linux, iPhone oder Android zu verwenden, sofern m\u00f6glich. Unsere Softphones<strong> verwenden das WebRTC-Protokoll<\/strong>, mit dem wir das f\u00fcr SIP beschriebene Problem vermeiden w\u00fcrden.<\/span><\/p>\n<h3>STUN-Server aktivieren<\/h3>\n<p><span style=\"font-weight: 400;\">Aktivieren und konfigurieren Sie den VoIPstudio STUN-Server &#8222;stun.ssl7.net&#8220; in den SIP-Ger\u00e4ten, die diese Option haben. Zum Beispiel ist das Zoiper Smartphone-Softphone sehr empfindlich f\u00fcr dieses Problem. In den meisten F\u00e4llen ist die Konfiguration des STUN von VoIPstudio wie im Bild gezeigt gel\u00f6st.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-48332\" src=\"https:\/\/voipstudio.com\/wp-content\/uploads\/zoiper-calls-cut-after-30-second-1.png\" alt=\"zoiper calls cut after 30 second\" width=\"1128\" height=\"315\" \/><\/p>\n<p><em>Hinweis: Nach allen Stabilit\u00e4tstests, die VoIPstudio mit der mobilen App von Zoiper durchgef\u00fchrt hat, ist die beste Einstellung, STUN auf NO zu setzen. <\/em><\/p>\n<h3>Zus\u00e4tzliche Einstellungen<\/h3>\n<p><span style=\"font-weight: 400;\">Weitere Einstellungen, die vorgenommen werden k\u00f6nnen, sind:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Setzen Sie das Transportprotokoll von UDP auf TCP.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Verwenden Sie unseren sekund\u00e4ren SIP-Port 5566<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Reduzieren Sie die Wiederholungszeit bei der SIP-Registrierung<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Konfigurieren Sie NAT-Regeln im Router f\u00fcr unser IP-Telefon.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Konfigurieren Sie eine DMZ im Router und platzieren Sie das IP-Telefon dort. Sie m\u00fcssen also zus\u00e4tzliche Sicherheitsma\u00dfnahmen bei der Zugriffskontrolle des Terminals ergreifen. Man sollte es unter keinen Umst\u00e4nden mit den Standard-Zugangsdaten belassen.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Wenn Sie ein <a href=\"https:\/\/voipstudio.de\/\">VoIPstudio<\/a>-Kunde sind und eines dieser Probleme auftritt, z\u00f6gern Sie nicht, <strong>ein Support-Ticket bei uns zu er\u00f6ffnen<\/strong>, wie im Bild unten gezeigt, damit wir Ihnen bei der Diagnose und L\u00f6sung des Problems helfen k\u00f6nnen.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-48342\" src=\"https:\/\/voipstudio.com\/wp-content\/uploads\/VoIPstudio-Support-ticket.png\" alt=\"VoIPstudio Support Ticket\" width=\"1121\" height=\"592\" \/><\/p>\n<p><span style=\"font-weight: 400;\"> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Normalerweise werden beim Empfangen von Anrufen Telefongespr\u00e4che korrekt aufgebaut und Gespr\u00e4chspartner k\u00f6nnen miteinander problemlos kommunizieren.\u00a0Aber, was passiert, wenn pl\u00f6tzlichdas Gespr\u00e4chs f\u00fcr ein [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":37688,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[440],"tags":[],"class_list":["post-29923","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geschaeftskommunikation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ursachen und L\u00f6sungen f\u00fcr VoIP-Anrufabbr\u00fcche &#183; VoIPstudio<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/voipstudio.com\/de\/blog\/ursachen-und-loesungen-fuer-voip-anrufabbrueche\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" 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