{"id":18612,"date":"2018-09-28T09:45:20","date_gmt":"2018-09-28T07:45:20","guid":{"rendered":"https:\/\/blog.wildix.com\/?p=18612"},"modified":"2018-09-28T10:03:23","modified_gmt":"2018-09-28T08:03:23","slug":"sip-alg-lennemi-sous-estime-de-la-voip","status":"publish","type":"post","link":"https:\/\/blog.wildix.com\/fr\/sip-alg-lennemi-sous-estime-de-la-voip\/","title":{"rendered":"SIP-ALG, l’ennemi sous-estim\u00e9 de la VoIP"},"content":{"rendered":"

\"\"<\/p>\n

La fonction SIP-ALG est sens\u00e9e simplifier la vie des p\u00e9riph\u00e9riques SIP derri\u00e8re NAT \/ PAT et fonctionne en r\u00e9\u00e9crivant les informations d’en-t\u00eate SIP et de session SDP pertinentes avec l’adresse IP publique du routeur et du port utilis\u00e9.<\/p>\n

Lorsque le trafic SIP est crypt\u00e9 \u00e0 l’aide de TLS, les routeurs ne peuvent pas manipuler les paquets afin que les p\u00e9riph\u00e9riques utilisant TLS ne soient pas affect\u00e9s. C’est pourquoi, tous les utilisateurs de Wildix rencontrent moins de probl\u00e8mes lors de la connexion de p\u00e9riph\u00e9riques distants et b\u00e9n\u00e9ficient d’un niveau de s\u00e9curit\u00e9 plus \u00e9lev\u00e9.
\n
\nLa majorit\u00e9 des op\u00e9rateurs SIP ne prennent malheureusement pas en charge TLS et le chiffrement, ce qui permet aux routeurs compatibles SIP-ALG de modifier les paquets en transit. Le probl\u00e8me est que souvent les options SIP-ALG ne fonctionnent pas correctement ou que les modifications apport\u00e9es par l’application SIP-ALG r\u00e9sident sur le routeur, en conflit avec les changements d’en-t\u00eates NAT travers\u00e9s par le point de terminaison SIP (g\u00e9n\u00e9ralement par les p\u00e9riph\u00e9riques compatibles STUN). Dans de tels cas, il en r\u00e9sulte des appels n’ayant aucun sens.<\/p>\n

La meilleure approche consiste \u00e0 d\u00e9sactiver l’option SIP-ALG et \u00e0 toujours utiliser le chiffrement chaque fois que cela est possible.<\/p>\n

Une fois l’option SIP-ALG d\u00e9sactiv\u00e9s, notez que le routeur \/ pare-feu n’ouvrira automatiquement aucun port pour RTP, car il arr\u00eatera d’analyser tous les paquets SIP. Pour cette raison, assurez-vous que l’op\u00e9rateur prend en charge le protocole RTP sym\u00e9trique et r\u00e9pondra avec les paquets RTP \u00e0 l’adresse \/ au port d’o\u00f9 ils proviennent, ou qu’une redirection de port compl\u00e8te pour tous les ports RTP de la gamme est activ\u00e9e (ex : 10000-11000).<\/p>\n

Ci-dessous, une liste des ressources disponibles pour d\u00e9sactiver l’option SIP-ALG sur les routeurs:<\/p>\n

Cisco 1800 – \u00a0https:\/\/supportforums.cisco.com\/discussion\/11262011\/disable-sip-alg-cisco-1800-series-router<\/p>\n

Fortigate:<\/p>\n

    \n
  1. Ouvrez la CLI Fortigate depuis le tableau de bord.<\/li>\n
  2. Entrez les commandes suivantes dans la CLI de FortiGate:\n
      \n
    1. param\u00e8tres du syst\u00e8me de configuration<\/li>\n
    2. d\u00e9sactiver l’assistance SIP<\/li>\n
    3. d\u00e9sactiver SIP-nat-trace<\/li>\n
    4. red\u00e9marrer l’appareil<\/li>\n<\/ol>\n<\/li>\n
    5. Rouvrir CLI et entrez les commandes suivantes – ne pas entrer de texte apr\u00e8s \/\/:\n
        \n
      1. configuration du syst\u00e8me d’assistance de session<\/li>\n
      2. affiche \/\/ recherche l’entr\u00e9e SIP, g\u00e9n\u00e9ralement 12, mais peut varier.<\/li>\n
      3. supprimer 12 \/\/ ou le num\u00e9ro que vous avez identifi\u00e9 \u00e0 partir de la commande pr\u00e9c\u00e9dente.<\/li>\n<\/ol>\n<\/li>\n
      4. D\u00e9sactivez le traitement RTP comme suit:\n
          \n
        1. configuration du profil VoIP<\/li>\n
        2. modifier par d\u00e9faut<\/li>\n
        3. configuration SIP<\/li>\n
        4. d\u00e9sactiver RTP<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

          Technicolor, Thomson ou SpeedTouch Router – \u00a0http:\/\/docs.sipcentric.com\/article\/142-technicolor-or-thomson-router<\/a>
          \nZyxel –\u00a0http:\/\/www.voiptuts.com\/2011\/02\/disable-sip-alg-on-zyxel-660-family.html<\/p>\n

          SonicWall –\u00a0https:\/\/support.siteserver.com\/kb\/a109\/sonicwall-disabling-sip-alg.aspx<\/a><\/p>\n

          Asus Routers:<\/strong> \u00a0<\/span><\/p>\n

          D\u00e9sactiver l’option ‘SIP Passerelle’ sous \u00ab\u00a0Param\u00e8tres avanc\u00e9s \/ WAN\u00a0\u00bb -> \u00ab\u00a0NAT Passerelle\u00a0\u00bb.<\/span><\/p>\n

          Si votre routeur ne dispose pas de cette option, SIP-ALG peut \u00eatre d\u00e9sactiv\u00e9 via Telnet.<\/p>\n

          Billion:\u00a0<\/strong><\/span><\/p>\n

          Recherchez l’option SIP-ALG dans les param\u00e8tres NAT ou du pare-feu.<\/p>\n

          DrayTek<\/strong>:<\/span><\/p>\n

          Disabling SIP ALG<\/a><\/span><\/p>\n

          TP-Link<\/strong>:\u00a0<\/span><\/p>\n

          How to Disable SIP ALG on TP-Link<\/strong> ADSL modem router<\/a><\/span><\/p>\n

          \u00a0<\/span>Linksys<\/strong>:<\/span><\/p>\n

          Recherchez l’option \u00ab\u00a0SIP-ALG\u00a0\u00bb dans l’onglet \u00ab\u00a0Administration\u00a0\u00bb sous \u00ab\u00a0Avanc\u00e9\u00a0\u00bb.<\/p>\n

          Il peut \u00e9galement \u00eatre n\u00e9cessaire de d\u00e9sactiver le pare-feu SPI.<\/p>\n

          Microtik<\/strong>:<\/span><\/p>\n

          D\u00e9sactiver ‘SIP Helper<\/a>‘.\u00a0<\/span><\/p>\n

          Netgear<\/strong>:<\/span><\/p>\n

          Recherchez une case \u00e0 cocher \u00abSIP-ALG\u00bb dans les param\u00e8tres \u00abWAN\u00bb.<\/p>\n

          Port Scan et Protection\u00a0DoS doivent \u00e9galement \u00eatre d\u00e9sactiv\u00e9s.<\/span><\/p>\n

          D\u00e9sactivez STUN dans les param\u00e8tres VoIP du t\u00e9l\u00e9phone.<\/p>\n

          D-Link<\/strong>:<\/span><\/p>\n

          Dans les param\u00e8tres \u00ab\u00a0Avanc\u00e9s\u00a0\u00bb -> \u00ab\u00a0Configuration de la passerelle au niveau de l’application (ALG)\u00a0\u00bb, d\u00e9cochez l’option \u00ab\u00a0SIP\u00a0\u00bb.<\/p>\n

          Huawei:<\/strong><\/span><\/p>\n

          Le param\u00e8tre SIP-ALG se trouve g\u00e9n\u00e9ralement dans le menu \u00ab\u00a0S\u00e9curit\u00e9\u00a0\u00bb.<\/p>\n

          Adtran Netvanta:<\/strong>\u00a0<\/span><\/p>\n

          D\u00e9sactivez SIP-ALG sous \u00ab\u00a0Firewall \/ ACLs\u00a0\u00bb -> \u00ab\u00a0ALG Param\u00e8tres\u00a0\u00bb.<\/p>\n","protected":false},"excerpt":{"rendered":"

          La fonction SIP-ALG est sens\u00e9e simplifier la vie des p\u00e9riph\u00e9riques SIP derri\u00e8re NAT \/ PAT et fonctionne en r\u00e9\u00e9crivant les informations d’en-t\u00eate SIP et de session SDP pertinentes avec l’adresse IP publique du routeur et du port utilis\u00e9. Lorsque le trafic SIP est crypt\u00e9 \u00e0 l’aide de TLS, les routeurs ne peuvent pas manipuler les … <\/p>\n

          Continuer la lecture de « SIP-ALG, l’ennemi sous-estim\u00e9 de la VoIP »<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53,80],"tags":[],"class_list":["post-18612","post","type-post","status-publish","format-standard","hentry","category-blog-fr","category-infostechniques"],"acf":[],"yoast_head":"\nSIP-ALG, l'ennemi sous-estim\u00e9 de la VoIP | Wildix<\/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:\/\/blog.wildix.com\/fr\/sip-alg-lennemi-sous-estime-de-la-voip\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SIP-ALG, l'ennemi sous-estim\u00e9 de la VoIP | Wildix\" \/>\n<meta property=\"og:description\" content=\"La fonction SIP-ALG est sens\u00e9e simplifier la vie des p\u00e9riph\u00e9riques SIP derri\u00e8re NAT \/ PAT et fonctionne en r\u00e9\u00e9crivant les informations d’en-t\u00eate SIP et de session SDP pertinentes avec l’adresse IP publique du routeur et du port utilis\u00e9. Lorsque le trafic SIP est crypt\u00e9 \u00e0 l’aide de TLS, les routeurs ne peuvent pas manipuler les … Continuer la lecture de « SIP-ALG, l’ennemi sous-estim\u00e9 de la VoIP »\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wildix.com\/fr\/sip-alg-lennemi-sous-estime-de-la-voip\/\" \/>\n<meta property=\"og:site_name\" content=\"Wildix Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/wildix.pbx\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/dimitri.osler\" \/>\n<meta property=\"article:published_time\" content=\"2018-09-28T07:45:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-09-28T08:03:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wildix.com\/wp-content\/uploads\/2018\/09\/SIPALG-300x269.gif\" \/>\n<meta name=\"author\" content=\"Dimitri Osler\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" 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