{"id":4135,"date":"2026-08-04T11:05:00","date_gmt":"2026-08-04T09:05:00","guid":{"rendered":"https:\/\/business.onoff.app\/?p=4135"},"modified":"2026-08-13T19:16:59","modified_gmt":"2026-08-13T17:16:59","slug":"quest-ce-que-la-voip-et-comment-ca-marche","status":"publish","type":"post","link":"https:\/\/business.onoff.app\/fr\/blog\/technologie-telecoms\/quest-ce-que-la-voip-et-comment-ca-marche\/","title":{"rendered":"Qu&#8217;est-ce que la VoIP ? Fonctionnement, co\u00fbts et migration (guide 2026)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4135\" class=\"elementor elementor-4135\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c4d628c elementor-section-boxed elementor-section-height-default elementor-section-height-default wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no\" data-id=\"c4d628c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-48ee594\" data-id=\"48ee594\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3ce4a39 elementor-widget elementor-widget-text-editor\" data-id=\"3ce4a39\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"\/blog\/\">\u2190 Blog<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-851e6c8 elementor-widget elementor-widget-image\" data-id=\"851e6c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1620\" height=\"900\" src=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1.png\" class=\"attachment-full size-full wp-image-4183\" alt=\"\" srcset=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1.png 1620w, 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class=\"elementor-heading-title elementor-size-default\">Qu'est-ce que la VoIP ? Fonctionnement, co\u00fbts et migration (guide 2026)<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2033a74 elementor-widget elementor-widget-text-editor\" data-id=\"2033a74\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Depuis le 31 janvier 2026, la fermeture commerciale du r\u00e9seau cuivre est prononc\u00e9e pour environ 25 000 communes fran\u00e7aises, soit pr\u00e8s des trois quarts du territoire. Concr\u00e8tement : plus aucun op\u00e9rateur ne peut y vendre une nouvelle ligne analogique. La fermeture technique, celle qui coupe physiquement les lignes, suit lot par lot jusqu&#8217;\u00e0 fin 2030.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">R\u00e9sultat, une question technique est devenue une question de continuit\u00e9 d&#8217;activit\u00e9. Ce guide explique ce qu&#8217;est la VoIP, comment elle fonctionne r\u00e9ellement, ce qu&#8217;elle exige de votre r\u00e9seau, ce qu&#8217;elle co\u00fbte, et ce qu&#8217;elle ne r\u00e9sout pas.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cc48ea6 elementor-widget elementor-widget-heading\" data-id=\"cc48ea6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">La VoIP, c'est quoi ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a3901a elementor-widget elementor-widget-text-editor\" data-id=\"6a3901a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">VoIP est l&#8217;acronyme de <em>Voice over Internet Protocol<\/em>, traduit en fran\u00e7ais par voix sur IP. C&#8217;est une technologie qui transporte la voix sous forme de donn\u00e9es num\u00e9riques sur un r\u00e9seau IP: Internet, fibre, 4G\/5G, ou un r\u00e9seau d&#8217;entreprise, au lieu de la faire circuler sur le r\u00e9seau t\u00e9l\u00e9phonique commut\u00e9 historique. La diff\u00e9rence de fond tient au mode de transport.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Sur le RTC, un appel r\u00e9servait un circuit physique de bout en bout pendant toute sa dur\u00e9e. Ce circuit vous appartenait, occup\u00e9 ou silencieux, jusqu&#8217;au raccroch\u00e9. Sur un r\u00e9seau IP, la voix est d\u00e9coup\u00e9e en paquets qui empruntent le m\u00eame r\u00e9seau que vos e-mails et vos visios, chacun trouvant son chemin ind\u00e9pendamment. Aucune ressource n&#8217;est r\u00e9serv\u00e9e. C&#8217;est ce qui rend la VoIP nettement moins ch\u00e8re, et c&#8217;est aussi ce qui explique ses points faibles, nous y revenons plus bas.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Un point de vocabulaire qui pr\u00eate \u00e0 confusion : la VoIP n&#8217;est pas une marque, ni un logiciel, ni un fournisseur. C&#8217;est un principe de transport. Teams, WhatsApp, un standard t\u00e9l\u00e9phonique cloud et un op\u00e9rateur professionnel utilisent tous la VoIP, avec des niveaux de service radicalement diff\u00e9rents.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c5714c3 elementor-widget elementor-widget-image\" data-id=\"c5714c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"527\" src=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/voip-penetration-tests-01-1024x675.png\" class=\"attachment-large size-large wp-image-4136\" alt=\"\" srcset=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/voip-penetration-tests-01-1024x675.png 1024w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/voip-penetration-tests-01-300x198.png 300w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/voip-penetration-tests-01-768x506.png 768w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/voip-penetration-tests-01-1536x1013.png 1536w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/voip-penetration-tests-01-2048x1351.png 2048w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fec1b47 elementor-widget elementor-widget-text-editor\" data-id=\"fec1b47\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"mt-3 -mb-1 text-[1.125rem] font-bold\" dir=\"ltr\">Comment fonctionne un appel VoIP, \u00e9tape par \u00e9tape<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8adcd12 elementor-widget elementor-widget-text-editor\" data-id=\"8adcd12\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Voici ce qui se passe entre le moment o\u00f9 vous composez un num\u00e9ro et celui o\u00f9 votre interlocuteur vous entend.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>1. Signalisation.<\/strong> Votre \u00e9quipement envoie une invitation \u00e0 \u00e9tablir l&#8217;appel vers le serveur de votre op\u00e9rateur. Il transmet qui appelle, qui est appel\u00e9, et quels formats audio il sait g\u00e9rer. C&#8217;est le r\u00f4le du protocole SIP.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>2. N\u00e9gociation.<\/strong> Les deux extr\u00e9mit\u00e9s se mettent d&#8217;accord sur un codec commun, c&#8217;est-\u00e0-dire un format de compression audio. Si aucun terrain d&#8217;entente n&#8217;existe, l&#8217;appel \u00e9choue, d&#8217;o\u00f9 certaines incompatibilit\u00e9s entre \u00e9quipements anciens et solutions modernes.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>3. Num\u00e9risation.<\/strong> Votre voix, un signal analogique, est \u00e9chantillonn\u00e9e puis compress\u00e9e par le codec retenu. Un flux continu devient une suite de petits blocs de donn\u00e9es, typiquement un toutes les 20 millisecondes.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>4. Transport.<\/strong> Ces blocs sont encapsul\u00e9s dans des paquets et envoy\u00e9s sur le r\u00e9seau via RTP. Un appel produit environ 50 paquets par seconde dans chaque sens. Ils peuvent arriver dans le d\u00e9sordre, en retard, ou pas du tout.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>5. Reconstitution.<\/strong> \u00c0 l&#8217;arriv\u00e9e, un tampon de gigue (<em>jitter buffer<\/em>) r\u00e9ordonne les paquets, compense les micro-retards, puis le codec reconstruit le signal audio. Les paquets manquants sont masqu\u00e9s par interpolation \u2014 c&#8217;est pourquoi une perte mod\u00e9r\u00e9e reste inaudible, et une perte forte donne cette voix hach\u00e9e caract\u00e9ristique.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">L&#8217;ensemble tient en quelques dizaines de millisecondes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59aade3 elementor-widget elementor-widget-image\" data-id=\"59aade3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"143\" src=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VoIP-Diagram-1024x183.png\" class=\"attachment-large size-large wp-image-4138\" alt=\"\" srcset=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VoIP-Diagram-1024x183.png 1024w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VoIP-Diagram-300x54.png 300w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VoIP-Diagram-768x138.png 768w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VoIP-Diagram-1536x275.png 1536w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VoIP-Diagram-2048x367.png 2048w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a39de0 elementor-widget elementor-widget-heading\" data-id=\"2a39de0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">SIP, RTP, codecs : qui fait quoi<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1889442 elementor-widget elementor-widget-text-editor\" data-id=\"1889442\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><span class=\"_animating_1lnon_10\" data-newtext-seq=\"0\">Trois briques reviennent <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"25\">en permanence dans la documentation <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"61\">VoIP, et elles ont des r\u00f4les distincts.<\/span><\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\">SIP<\/span><\/strong><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\"> (<\/span><em><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\">Session Initiation Protocol<\/span><\/em><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\">)<\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"39\"> g\u00e8re la signalisation : \u00e9tablir, <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"73\">modifier et terminer l&#8217;appel. Il ne <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"109\">transporte pas la voix. C&#8217;est <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"139\">l&#8217;\u00e9quivalent de la sonnerie et du <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"173\">d\u00e9croch\u00e9. Standardis\u00e9 par la RFC 3261, <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"212\">il est devenu le protocole dominant en <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"251\">environnement professionnel \u2014 <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"281\">d&#8217;o\u00f9 l&#8217;expression \u00ab trunk SIP \u00bb pour <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"318\">d\u00e9signer un lien op\u00e9rateur.<\/span><\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\">RTP<\/span><\/strong><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\"> (<\/span><em><span class=\"_animating_1lnon_10\" data-newtext-seq=\"10\">Real-time Transport Protocol<\/span><\/em><span class=\"_animating_1lnon_10\" data-newtext-seq=\"10\">) <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"41\">transporte le flux audio proprement <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"77\">dit, <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"82\">une fois l&#8217;appel \u00e9tabli. Sa version <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"118\">chiffr\u00e9e, SRTP, prot\u00e8ge le contenu de <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"156\">la conversation.<\/span><\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong><span class=\"_animating_1lnon_10\" data-newtext-seq=\"2\">Le codec<\/span><\/strong> <span class=\"_animating_1lnon_10\" data-newtext-seq=\"13\">d\u00e9termine la qualit\u00e9 et le d\u00e9bit. Trois <\/span><span class=\"_animating_1lnon_10\" data-newtext-seq=\"53\">r\u00e9f\u00e9rences \u00e0 conna\u00eetre :<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7e528e7 elementor-widget__width-auto premium-table-dir-ltr elementor-widget elementor-widget-premium-tables-addon\" data-id=\"7e528e7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"premium-tables-addon.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n\t\t<div class=\"premium-table-wrap\">\n\t\t\t\n\t\t\t<table class=\"premium-table\" data-settings=\"{&quot;sort&quot;:false,&quot;sortMob&quot;:false,&quot;search&quot;:false,&quot;records&quot;:false,&quot;dataType&quot;:&quot;custom&quot;,&quot;csvFile&quot;:null,&quot;firstRow&quot;:null,&quot;separator&quot;:null,&quot;pagination&quot;:&quot;&quot;,&quot;rows&quot;:0}\" >\n\n\t\t\t\n\t\t<thead class=\"premium-table-head\">\n\n\t\t\t<tr class=\"premium-table-row\">\n\n\t\t\t\t<th class=\"premium-table-cell elementor-repeater-item-163a3b5\"><span class=\"premium-table-text\">Codec<\/span><\/th><th class=\"premium-table-cell elementor-repeater-item-90d4b1e\"><span class=\"premium-table-text\">D\u00e9bit utile<\/span><\/th><th class=\"premium-table-cell elementor-repeater-item-1927f0c\"><span class=\"premium-table-text\">D\u00e9bit r\u00e9el avec en-t\u00eates<\/span><\/th><th class=\"premium-table-cell elementor-repeater-item-0887f19\"><span class=\"premium-table-text\">Usage<\/span><\/th>\n\t\t\t<\/tr>\n\n\t\t<\/thead>\n\n\t\t\t\t<tbody class=\"premium-table-body\">\n\t\t\t\t\t\t<tr class=\"premium-table-row elementor-repeater-item-d67b776\"><td class=\"premium-table-cell elementor-repeater-item-cccf1dc\"><span class=\"premium-table-text\">G.711<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-b8703b0\"><span class=\"premium-table-text\">64 kbit\/s<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-a684cf6\"><span class=\"premium-table-text\">~85\u2013100 kbit\/s<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-0405069\"><span class=\"premium-table-text\">Qualit\u00e9 fixe classique, aucune compression, r\u00e9f\u00e9rence historique<\/span><\/span><\/td><\/tr><tr class=\"premium-table-row elementor-repeater-item-3fbdcaa\"><td class=\"premium-table-cell elementor-repeater-item-f3c4664\"><span class=\"premium-table-text\">G.729<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-0008109\"><span class=\"premium-table-text\">8 kbit\/s<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-b54854a\"><span class=\"premium-table-text\">~30 kbit\/s<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-68e12e7\"><span class=\"premium-table-text\">Liens contraints, qualit\u00e9 audible mais d\u00e9grad\u00e9e<\/span><\/span><\/td><\/tr><tr class=\"premium-table-row elementor-repeater-item-369bd3a\"><td class=\"premium-table-cell elementor-repeater-item-f83a685\"><span class=\"premium-table-text\">Opus<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-191fbe0\"><span class=\"premium-table-text\">variable<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-85560ed\"><span class=\"premium-table-text\">~24\u201340 kbit\/s en voix<\/span><\/span><\/td><td class=\"premium-table-cell elementor-repeater-item-16948aa\"><span class=\"premium-table-text\">Standard moderne, s'adapte \u00e0 la bande passante disponible<\/span><\/span><\/td>\t\t\t<\/tr>\n\t\t<\/tbody>\n\n\t\t\n\t\t\t<\/table>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d05f377 elementor-widget elementor-widget-heading\" data-id=\"d05f377\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">VoIP, ToIP, t\u00e9l\u00e9phonie IP, RTC : le vocabulaire d\u00e9cod\u00e9<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2e50ffd elementor-widget elementor-widget-text-editor\" data-id=\"2e50ffd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"isSelectedEnd\">Les termes VoIP, ToIP, SIP ou encore t\u00e9l\u00e9phonie IP sont souvent employ\u00e9s comme des synonymes, alors qu\u2019ils ne d\u00e9signent pas exactement la m\u00eame chose.<\/p><p class=\"isSelectedEnd\"><strong>La VoIP, ou voix sur IP<\/strong>, est la technologie qui permet de transporter la voix via un r\u00e9seau Internet. Il s\u2019agit avant tout d\u2019un principe technique.<\/p><p class=\"isSelectedEnd\"><strong>La ToIP, ou t\u00e9l\u00e9phonie sur IP<\/strong>, correspond \u00e0 l\u2019utilisation professionnelle de la VoIP. Elle regroupe des services comme les num\u00e9ros professionnels, le standard t\u00e9l\u00e9phonique, les transferts d\u2019appels, la messagerie vocale ou encore les statistiques.<\/p><p class=\"isSelectedEnd\"><strong>La t\u00e9l\u00e9phonie IP<\/strong> est g\u00e9n\u00e9ralement employ\u00e9e comme synonyme de ToIP dans le langage courant.<\/p><p class=\"isSelectedEnd\"><strong>Le SIP<\/strong> est le principal protocole utilis\u00e9 pour \u00e9tablir, g\u00e9rer et terminer les communications. C\u2019est une composante de la VoIP, mais pas un synonyme.<\/p><p class=\"isSelectedEnd\"><strong>Un trunk SIP<\/strong> relie l\u2019\u00e9quipement t\u00e9l\u00e9phonique d\u2019une entreprise \u00e0 son op\u00e9rateur. Sa capacit\u00e9 est g\u00e9n\u00e9ralement d\u00e9finie selon le nombre d\u2019appels simultan\u00e9s autoris\u00e9s.<\/p><p class=\"isSelectedEnd\"><strong>Le RTC<\/strong> d\u00e9signe le r\u00e9seau t\u00e9l\u00e9phonique commut\u00e9 historique, associ\u00e9 aux anciennes lignes fixes et aujourd\u2019hui en cours de fermeture.<\/p><p class=\"isSelectedEnd\"><strong>Le PABX et l\u2019IPBX<\/strong> sont des standards t\u00e9l\u00e9phoniques d\u2019entreprise. Le PABX fonctionne avec les technologies t\u00e9l\u00e9phoniques traditionnelles, tandis que l\u2019IPBX repose sur le protocole IP.<\/p><p>En pratique, toute solution de ToIP utilise la VoIP, mais toute application de VoIP ne constitue pas une solution de ToIP. Une application de messagerie peut, par exemple, transmettre la voix par Internet sans proposer de num\u00e9ro professionnel, de portabilit\u00e9 ou d\u2019acheminement des appels d\u2019urgence.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e3c80cf elementor-widget elementor-widget-heading\" data-id=\"e3c80cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Combien co\u00fbte la t\u00e9l\u00e9phonie VoIP<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-083fa5b elementor-widget elementor-widget-text-editor\" data-id=\"083fa5b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Trois postes structurent la facture. Les ordres de grandeur ci-dessous correspondent au march\u00e9 fran\u00e7ais ; ils varient selon le volume et la dur\u00e9e d&#8217;engagement.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>L&#8217;abonnement par utilisateur<\/strong> : de l&#8217;ordre de 10 \u00e0 30 \u20ac HT par mois et par ligne, selon les fonctions incluses (appels illimit\u00e9s, standard, statistiques, int\u00e9grations).<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>Les communications hors forfait<\/strong> : international, num\u00e9ros sp\u00e9ciaux, appels vers mobiles selon les destinations. C&#8217;est la ligne la plus souvent sous-estim\u00e9e dans les comparatifs.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>La mise en service<\/strong> : portabilit\u00e9 des num\u00e9ros, configuration, formation. Souvent factur\u00e9e, parfois offerte au-del\u00e0 d&#8217;un certain volume.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Ce qui dispara\u00eet, en revanche, p\u00e8se lourd dans la comparaison : l&#8217;abonnement mensuel par ligne analogique, la maintenance du PABX, les interventions techniques pour ajouter ou d\u00e9placer un poste, et pour les \u00e9quipes mobiles, la seconde ligne mobile souvent financ\u00e9e pour s\u00e9parer pro et perso.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Le calcul honn\u00eate n&#8217;est donc pas \u00ab prix VoIP contre prix RTC \u00bb, mais co\u00fbt complet actuel contre co\u00fbt complet cible. Notre <a href=\"https:\/\/business.onoff.app\/fr\/ressources\/nos-comparateurs\/calculatrice-economie\/\"><strong>comparateur d&#8217;\u00e9conomie <\/strong><\/a>permet de poser les deux colonnes c\u00f4te \u00e0 c\u00f4te.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a1f09c elementor-widget elementor-widget-heading\" data-id=\"9a1f09c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Passer \u00e0 la VoIP : les grandes lignes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2611737 elementor-widget elementor-widget-text-editor\" data-id=\"2611737\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Un projet de migration tient en quelques temps forts : identifier le lot de fermeture de chaque site, inventorier toutes les lignes, postes, mais aussi ascenseurs, alarmes, fax et terminaux de paiement, auditer le r\u00e9seau, puis lancer la portabilit\u00e9, qui reste le poste le plus long. Sur une dizaine de postes, comptez deux \u00e0 trois mois entre le premier inventaire et le dernier utilisateur bascul\u00e9.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Un point \u00e0 trancher t\u00f4t plut\u00f4t que tard : l&#8217;int\u00e9gration avec vos outils existants. La <a href=\"https:\/\/business.onoff.app\/fr\/fonctionnalites\/integrations\/\"><strong>remont\u00e9e automatique des appels dans votre CRM<\/strong><\/a> \u00e9vite la double saisie et rend l&#8217;activit\u00e9 t\u00e9l\u00e9phonique exploitable, c&#8217;est plus difficile \u00e0 rattraper une fois le d\u00e9ploiement termin\u00e9.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Le d\u00e9tail du calendrier par commune, la grille d&#8217;inventaire des \u00e9quipements et les \u00e9tapes de migration sont trait\u00e9s dans notre <strong><a href=\"https:\/\/business.onoff.app\/fr\/blog\/actualite\/fin-du-rtc\/\">guide sur la fin du RTC<\/a><\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-064d494 elementor-widget elementor-widget-text-editor\" data-id=\"064d494\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Passez \u00e0 la VoIP sans interrompre votre activit\u00e9<\/strong><\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e8759d7 elementor-widget elementor-widget-text-editor\" data-id=\"e8759d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Passez \u00e0 la VoIP avec Onoff Business. Conservez vos num\u00e9ros professionnels gr\u00e2ce \u00e0 la portabilit\u00e9 et centralisez vos appels, SMS et messages vocaux dans une solution de t\u00e9l\u00e9phonie cloud que vous pouvez connecter \u00e0 votre CRM.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b136f83 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"b136f83\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/welcome.onoffbusiness.com\/fr\/demande-de-demo\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Demander une d\u00e9mo<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b53079d elementor-widget elementor-widget-accordion\" data-id=\"b53079d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1891\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1891\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">La VoIP, c'est quoi en une phrase ?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1891\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1891\"><p>Une technologie qui transporte les appels t\u00e9l\u00e9phoniques sous forme de paquets de donn\u00e9es sur un r\u00e9seau IP plut\u00f4t que sur le r\u00e9seau t\u00e9l\u00e9phonique traditionnel en cuivre.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1892\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-1892\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Quelle diff\u00e9rence entre VoIP et SIP ?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1892\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1892\"><p>La VoIP d\u00e9signe le principe g\u00e9n\u00e9ral de transport de la voix sur IP. SIP est le protocole qui \u00e9tablit et termine les appels, une brique parmi d&#8217;autres. On ne les oppose pas : la quasi-totalit\u00e9 des solutions VoIP professionnelles utilisent SIP.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1893\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-1893\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">T\u00e9l\u00e9phonie VoIP et tT\u00e9l\u00e9phonie IP, est-ce la m\u00eame chose ?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1893\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-1893\"><p>Dans l&#8217;usage courant, oui. Les deux expressions d\u00e9signent la t\u00e9l\u00e9phonie professionnelle fonctionnant sur r\u00e9seau IP : num\u00e9ros, standard, transferts, statistiques. La nuance stricte tient au fait que \u00ab VoIP \u00bb renvoie au transport de la voix, tandis que \u00ab t\u00e9l\u00e9phonie IP \u00bb d\u00e9signe le service complet construit dessus.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1894\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-1894\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Peut-on garder ses num\u00e9ros existants ?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1894\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-1894\"><p>Oui. La portabilit\u00e9 est un droit encadr\u00e9 par la r\u00e9glementation fran\u00e7aise et s&#8217;applique aux num\u00e9ros fixes g\u00e9ographiques comme non g\u00e9ographiques. Pr\u00e9voyez plusieurs semaines de d\u00e9lai.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-419e2717 elementor-section-boxed elementor-section-height-default elementor-section-height-default wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no\" data-id=\"419e2717\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2c4b173d\" data-id=\"2c4b173d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5d8a4de elementor-widget elementor-widget-text-editor\" data-id=\"5d8a4de\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Articles r\u00e9cents :<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-529180cf premium-blog-align-left elementor-widget elementor-widget-premium-addon-blog\" data-id=\"529180cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;premium_blog_columns_number&quot;:&quot;33.33%&quot;,&quot;premium_blog_grid&quot;:&quot;yes&quot;,&quot;premium_blog_layout&quot;:&quot;even&quot;,&quot;premium_blog_columns_number_tablet&quot;:&quot;50%&quot;,&quot;premium_blog_columns_number_mobile&quot;:&quot;100%&quot;}\" data-widget_type=\"premium-addon-blog.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n\t\t\t\t<div class=\"premium-blog-wrap  premium-blog-even\" data-page=\"4135\">\n\t\t\t\t\t<div class=\"premium-blog-post-outer-container\" data-total=\"24\">\r\n\t\t\t<div class=\"premium-blog-post-container premium-blog-skin-classic\">\r\n\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-thumb-effect-wrapper\">\r\n\t\t\t\t\t\t<div class=\"premium-blog-thumbnail-container premium-blog-none-effect\">\r\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1456\" height=\"816\" src=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2026\/08\/marketing_onoff_Ultra-realistic_close-up_lifestyle_photograph_63791f1b-d410-4602-8a7e-9471a833407b_0-1.webp\" class=\"attachment-full size-full wp-image-9028\" alt=\"Comment migrer vers la VoIP sans interrompre votre activit\u00e9\" srcset=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2026\/08\/marketing_onoff_Ultra-realistic_close-up_lifestyle_photograph_63791f1b-d410-4602-8a7e-9471a833407b_0-1.webp 1456w, https:\/\/business.onoff.app\/wp-content\/uploads\/2026\/08\/marketing_onoff_Ultra-realistic_close-up_lifestyle_photograph_63791f1b-d410-4602-8a7e-9471a833407b_0-1-300x168.webp 300w, https:\/\/business.onoff.app\/wp-content\/uploads\/2026\/08\/marketing_onoff_Ultra-realistic_close-up_lifestyle_photograph_63791f1b-d410-4602-8a7e-9471a833407b_0-1-1024x574.webp 1024w, https:\/\/business.onoff.app\/wp-content\/uploads\/2026\/08\/marketing_onoff_Ultra-realistic_close-up_lifestyle_photograph_63791f1b-d410-4602-8a7e-9471a833407b_0-1-768x430.webp 768w\" sizes=\"(max-width: 1456px) 100vw, 1456px\" \/>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-thumbnail-overlay\">\r\n\t\t\t\t\t\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/business.onoff.app\/fr\/blog\/actualite\/fin-du-rtc\/\" target=\"_self\" aria-hidden=\"true\"><span>Fin du RTC : comment migrer vers la VoIP sans interrompre votre activit\u00e9<\/span><\/a>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-content-wrapper \">\r\n\r\n\t\t\t\t\t<div class=\"premium-blog-inner-container\">\r\n\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<h3 class=\"premium-blog-entry-title\">\r\n\t\t\t<a href=\"https:\/\/business.onoff.app\/fr\/blog\/actualite\/fin-du-rtc\/\" target=\"_self\">\r\n\t\t\t\tFin du RTC : comment migrer vers la VoIP sans interrompre votre activit\u00e9\t\t\t<\/a>\r\n\t\t<\/h3>\r\n\t\t\t\t<div class=\"premium-blog-entry-meta\">\r\n\t\t\t\r\n\t\t\t\t\t\t\t<span class=\"premium-blog-meta-separator\">\u2022<\/span>\r\n\t\t\t\t<div class=\"premium-blog-post-time premium-blog-meta-data\">\r\n\t\t\t\t\t<i class=\"fa fa-calendar-alt\" aria-hidden=\"true\"><\/i>\r\n\t\t\t\t\t<span>11 ao\u00fbt 2026<\/span>\r\n\t\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\t\t<\/div>\r\n\t\t\r\n\t\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t\t<div class=\"premium-blob-content-inner-wrapper\">\r\n\t\t<p class=\"premium-blog-post-content\">Le RTC ferme commune par commune jusqu'en 2030, et la fermeture commerciale est d\u00e9j\u00e0 effective presque partout. Voici les 7 \u00e9tapes pour migrer vos lignes fixes vers la VoIP sans perdre vos num\u00e9ros ni un seul appel.<\/p>\t\t <\/div>\r\n\t\t \r\n\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\r\n\t\t\t\t<div class=\"premium-blog-post-outer-container\" data-total=\"24\">\r\n\t\t\t<div class=\"premium-blog-post-container premium-blog-skin-classic\">\r\n\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-thumb-effect-wrapper\">\r\n\t\t\t\t\t\t<div class=\"premium-blog-thumbnail-container premium-blog-none-effect\">\r\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2021\/03\/ChatGPT-Image-Aug-11-2026-04_50_20-PM.webp\" class=\"attachment-full size-full wp-image-9130\" alt=\"Prospection t\u00e9l\u00e9phonique et cold calling : le guide complet\u200b\" srcset=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2021\/03\/ChatGPT-Image-Aug-11-2026-04_50_20-PM.webp 1672w, https:\/\/business.onoff.app\/wp-content\/uploads\/2021\/03\/ChatGPT-Image-Aug-11-2026-04_50_20-PM-300x169.webp 300w, https:\/\/business.onoff.app\/wp-content\/uploads\/2021\/03\/ChatGPT-Image-Aug-11-2026-04_50_20-PM-1024x576.webp 1024w, https:\/\/business.onoff.app\/wp-content\/uploads\/2021\/03\/ChatGPT-Image-Aug-11-2026-04_50_20-PM-768x432.webp 768w, https:\/\/business.onoff.app\/wp-content\/uploads\/2021\/03\/ChatGPT-Image-Aug-11-2026-04_50_20-PM-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-thumbnail-overlay\">\r\n\t\t\t\t\t\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/business.onoff.app\/fr\/blog\/technologie-telecoms\/cold-calling-la-teleprospection-est-elle-depassee\/\" target=\"_self\" aria-hidden=\"true\"><span>Prospection t\u00e9l\u00e9phonique et cold calling en 2026 : le guide complet\u200b<\/span><\/a>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-content-wrapper \">\r\n\r\n\t\t\t\t\t<div class=\"premium-blog-inner-container\">\r\n\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<h3 class=\"premium-blog-entry-title\">\r\n\t\t\t<a href=\"https:\/\/business.onoff.app\/fr\/blog\/technologie-telecoms\/cold-calling-la-teleprospection-est-elle-depassee\/\" target=\"_self\">\r\n\t\t\t\tProspection t\u00e9l\u00e9phonique et cold calling en 2026 : le guide complet\u200b\t\t\t<\/a>\r\n\t\t<\/h3>\r\n\t\t\t\t<div class=\"premium-blog-entry-meta\">\r\n\t\t\t\r\n\t\t\t\t\t\t\t<span class=\"premium-blog-meta-separator\">\u2022<\/span>\r\n\t\t\t\t<div class=\"premium-blog-post-time premium-blog-meta-data\">\r\n\t\t\t\t\t<i class=\"fa fa-calendar-alt\" aria-hidden=\"true\"><\/i>\r\n\t\t\t\t\t<span>6 ao\u00fbt 2026<\/span>\r\n\t\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\t\t<\/div>\r\n\t\t\r\n\t\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t\t<div class=\"premium-blob-content-inner-wrapper\">\r\n\t\t<p class=\"premium-blog-post-content\">La prospection t\u00e9l\u00e9phonique n'a pas disparu, elle a chang\u00e9 de terrain. Le cadre l\u00e9gal en B2B, la trame d'un appel qui aboutit, les objections qui reviennent et les r\u00e9sultats \u00e0 attendre.<\/p>\t\t <\/div>\r\n\t\t \r\n\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\r\n\t\t\t\t<div class=\"premium-blog-post-outer-container\" data-total=\"24\">\r\n\t\t\t<div class=\"premium-blog-post-container premium-blog-skin-classic\">\r\n\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-thumb-effect-wrapper\">\r\n\t\t\t\t\t\t<div class=\"premium-blog-thumbnail-container premium-blog-none-effect\">\r\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1620\" height=\"900\" src=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1.png\" class=\"attachment-full size-full wp-image-4183\" alt=\"\" srcset=\"https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1.png 1620w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1-300x167.png 300w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1-1024x569.png 1024w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1-768x427.png 768w, https:\/\/business.onoff.app\/wp-content\/uploads\/2022\/04\/VOIP-1-1536x853.png 1536w\" sizes=\"(max-width: 1620px) 100vw, 1620px\" \/>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-thumbnail-overlay\">\r\n\t\t\t\t\t\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/business.onoff.app\/fr\/blog\/technologie-telecoms\/quest-ce-que-la-voip-et-comment-ca-marche\/\" target=\"_self\" aria-hidden=\"true\"><span>Qu&#8217;est-ce que la VoIP ? Fonctionnement, co\u00fbts et migration (guide 2026)<\/span><\/a>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"premium-blog-content-wrapper \">\r\n\r\n\t\t\t\t\t<div class=\"premium-blog-inner-container\">\r\n\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<h3 class=\"premium-blog-entry-title\">\r\n\t\t\t<a href=\"https:\/\/business.onoff.app\/fr\/blog\/technologie-telecoms\/quest-ce-que-la-voip-et-comment-ca-marche\/\" target=\"_self\">\r\n\t\t\t\tQu&#8217;est-ce que la VoIP ? Fonctionnement, co\u00fbts et migration (guide 2026)\t\t\t<\/a>\r\n\t\t<\/h3>\r\n\t\t\t\t<div class=\"premium-blog-entry-meta\">\r\n\t\t\t\r\n\t\t\t\t\t\t\t<span class=\"premium-blog-meta-separator\">\u2022<\/span>\r\n\t\t\t\t<div class=\"premium-blog-post-time premium-blog-meta-data\">\r\n\t\t\t\t\t<i class=\"fa fa-calendar-alt\" aria-hidden=\"true\"><\/i>\r\n\t\t\t\t\t<span>4 ao\u00fbt 2026<\/span>\r\n\t\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\t\t<\/div>\r\n\t\t\r\n\t\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t\t<div class=\"premium-blob-content-inner-wrapper\">\r\n\t\t<p class=\"premium-blog-post-content\">La VoIP, c'est quoi exactement ? Comment un appel voyage en paquets, quel d\u00e9bit il faut vraiment, ce que co\u00fbte la t\u00e9l\u00e9phonie VoIP et ce qu'elle ne r\u00e9sout pas. Le vocabulaire d\u00e9cod\u00e9 et les chiffres qui comptent.<\/p>\t\t <\/div>\r\n\t\t \r\n\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\r\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>La VoIP, c&#8217;est quoi exactement ? Comment un appel voyage en paquets, quel d\u00e9bit il faut vraiment, ce que co\u00fbte la t\u00e9l\u00e9phonie VoIP et ce qu&#8217;elle ne r\u00e9sout pas. Le vocabulaire d\u00e9cod\u00e9 et les chiffres qui comptent.<\/p>\n","protected":false},"author":13,"featured_media":4183,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_angie_page":false,"content-type":"","page_builder":"","footnotes":""},"categories":[79],"tags":[34,31],"class_list":["post-4135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie-telecoms","tag-telephonie-dentreprise","tag-tendances"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VoIP c&#039;est quoi ? Fonctionnement et co\u00fbts | Guide 2026<\/title>\n<meta name=\"description\" content=\"La VoIP, c&#039;est quoi exactement ? 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