{"id":2786,"date":"2026-10-02T10:10:44","date_gmt":"2026-10-02T07:10:44","guid":{"rendered":"https:\/\/zvonex.com\/?p=2786"},"modified":"2026-10-02T10:10:44","modified_gmt":"2026-10-02T07:10:44","slug":"what-is-stir-shaken-and-why-your-calls-get-flagged-as-spam","status":"publish","type":"post","link":"https:\/\/zvonex.com\/en\/what-is-stir-shaken-and-why-your-calls-get-flagged-as-spam\/","title":{"rendered":"What Is STIR\/SHAKEN and Why Your Calls Get Flagged as Spam"},"content":{"rendered":"<p>If your outbound calls are showing up as &quot;Spam Likely&quot; or &quot;Scam Risk&quot; on recipients&#039; phones, STIR\/SHAKEN is the framework explaining why \u2014 and how to fix it.<\/p>\n<p>What STIR\/SHAKEN is:<\/p>\n<p>Secure Telephone Identity Revisited \/ Signature-based Handling of Asserted information using toKENs. (Yes, the acronym is forced.) It&#039;s a framework implemented in US and increasingly in other markets that cryptographically signs outbound calls to verify the caller&#039;s identity.<\/p>\n<p>The attestation levels:<\/p>\n<p>A (Full Attestation): The carrier knows the customer and their right to use the number being called from. This is the clean tier.<\/p>\n<p>B (Partial Attestation): The carrier knows the customer but can&#039;t verify their right to that specific number.<\/p>\n<p>C (Gateway Attestation): The call entered the network from an unknown source.<\/p>\n<p>Why your calls get flagged:<\/p>\n<p>Calls with B or C attestation are more likely to be marked as spam by receiving carriers. If you&#039;re using a VoIP provider that hasn&#039;t implemented STIR\/SHAKEN, or you&#039;re routing through a gateway that strips the signature, your calls arrive without authentication.<\/p>\n<p>How to fix it:<\/p>\n<p>Use a VoIP provider that implements full STIR\/SHAKEN attestation. Register your numbers with the provider in your name \u2014 don&#039;t use unregistered or ported numbers without verification. If using multiple carriers, ensure all legs of the call chain support the framework.<\/p>\n<p>The technical fix takes hours. The business impact \u2014 significantly higher answer rates \u2014 is immediate.<\/p>\n<p>\u2192 zvonex.com<\/p>\n<p>\ud83d\udce9 t.me\/zvonex_support<\/p>\n\n<!-- pa-seo-links:start -->\n<p class=\"pa-related-service wp-block-paragraph\"><strong>Learn more about the solution:<\/strong> <a href=\"https:\/\/zvonex.com\/en\/en-business-phone-system\/\">Business Phone Systems<\/a><\/p>\n<!-- pa-seo-links:end -->","protected":false},"excerpt":{"rendered":"<p>If your outbound calls are showing up as &quot;Spam Likely&quot; or &quot;Scam Risk&quot; on recipients&#039; phones, STIR\/SHAKEN is the framework explaining why \u2014 and\u2026<\/p>","protected":false},"author":0,"featured_media":2564,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49,242],"tags":[55,56,165,187,190,54,164,186,188,250,191,50,163,189,312,311,193,166,181,52,53,51],"pa_topic_cluster":[212],"class_list":["post-2786","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-ip-telephony","category-business-phone","tag-callcenter","tag-forex","tag-business-communication","tag-businesscosts","tag-businessphone","tag-call-center","tag-cloud-telephony","tag-cloudpbx","tag-cloudtelephony","tag-compliance","tag-costsavings","tag-ip-telephony","tag-sip-trunking","tag-siptrunk","tag-spamcalls","tag-stirshaken","tag-telecommunications","tag-virtual-numbers","tag-voip","tag-zvonex","tag-zvonex-com","tag-51"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is STIR\/SHAKEN and Why Your Calls Get Flagged as Spam - Zvonex \u2013 IP-\u0442\u0435\u043b\u0435\u0444\u043e\u043d\u0438\u044f \u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0435 \u043d\u043e\u043c\u0435\u0440\u0430 \u0434\u043b\u044f \u0431\u0438\u0437\u043d\u0435\u0441\u0430<\/title>\n<meta name=\"description\" content=\"If your outbound calls are showing up as &quot;Spam Likely&quot; or &quot;Scam Risk&quot; on recipients&#039; phones, STIR\/SHAKEN is the framework explaining why \u2014 and how to fix\u2026\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zvonex.com\/en\/what-is-stir-shaken-and-why-your-calls-get-flagged-as-spam\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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