{"id":16946,"date":"2026-07-03T10:07:04","date_gmt":"2026-07-03T04:37:04","guid":{"rendered":"https:\/\/www.fast2sms.com\/help\/?p=16946"},"modified":"2026-07-03T10:07:04","modified_gmt":"2026-07-03T04:37:04","slug":"ildo-traffic-header-template-blacklisting-by-dlt","status":"publish","type":"post","link":"https:\/\/www.fast2sms.com\/help\/ildo-traffic-header-template-blacklisting-by-dlt\/","title":{"rendered":"ILDO Traffic \u2013 Header &amp; Template Blacklisting by DLT"},"content":{"rendered":"<h2>What is ILDO Traffic?<\/h2>\n<p class=\"isSelectedEnd\"><strong>ILDO (International Long Distance Operator) leakage<\/strong> occurs when SMS traffic intended for <strong>international brands or entities<\/strong> is sent using <strong>DLT-approved Headers, Templates, or Entity credentials<\/strong> that are authorised only for domestic (India) messaging.<\/p>\n<p class=\"isSelectedEnd\">In simple terms, this means that your DLT credentials have either been <strong>compromised or misused<\/strong> to send SMS on behalf of an international brand. As per telecom regulations, international SMS traffic must be routed only through authorised ILDO channels.<\/p>\n<p class=\"isSelectedEnd\">Since this is considered a serious compliance violation, telecom operators and DLT providers may take immediate action against the associated DLT account.<\/p>\n<div>\n<hr \/>\n<\/div>\n<h1>Possible Actions Taken by Telecom Operators<\/h1>\n<p class=\"isSelectedEnd\">If ILDO traffic is detected, the following actions may be taken by the operator:<\/p>\n<ul data-spread=\"false\">\n<li>Blacklisting of DLT-approved Headers (Sender IDs)<\/li>\n<li>Blacklisting of DLT Templates<\/li>\n<li>Temporary suspension of DLT services<\/li>\n<li>Permanent blocking of the DLT account (in severe or repeated cases)<\/li>\n<\/ul>\n<div>\n<hr \/>\n<\/div>\n<h1>Resolution Steps<\/h1>\n<h2>Option 1: Quick Resolution (Recommended)<\/h2>\n<p class=\"isSelectedEnd\">To minimise disruption in your SMS services, we recommend creating <strong>new Headers and Templates<\/strong> and getting them approved through your DLT portal.<\/p>\n<p class=\"isSelectedEnd\">This is the fastest way to resume SMS communication while the existing blacklisted credentials remain under investigation.<\/p>\n<p class=\"isSelectedEnd\"><strong>Recommended when:<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>Business communication needs to resume immediately.<\/li>\n<li>You cannot wait for the operator&#8217;s investigation.<\/li>\n<\/ul>\n<div>\n<hr \/>\n<\/div>\n<h2>Option 2: Permanent Resolution<\/h2>\n<p class=\"isSelectedEnd\">If you want to restore the existing blacklisted Headers and Templates, raise a support ticket with the telecom operator that has blacklisted your DLT credentials and request the following information:<\/p>\n<h3>Request the Operator to Provide:<\/h3>\n<p class=\"isSelectedEnd\"><strong>a. ILDO Detection Logs<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>Date and time of the detected traffic<\/li>\n<li>Message samples<\/li>\n<li>Traffic logs<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\"><strong>b. International Brand Details<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>Name of the international brand\/entity<\/li>\n<li>Evidence showing that the traffic was associated with that brand<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\"><strong>c. Supporting Evidence<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>Any additional proof or logs that justify the blacklisting action<\/li>\n<\/ul>\n<div>\n<hr \/>\n<\/div>\n<h1>Mandatory Requirement for Whitelisting<\/h1>\n<p class=\"isSelectedEnd\">Telecom operators generally require a <strong>Cyber Cell Complaint<\/strong> before considering the restoration (whitelisting) of blacklisted Headers and Templates.<\/p>\n<p class=\"isSelectedEnd\">The complaint should clearly mention:<\/p>\n<ul data-spread=\"false\">\n<li>Your registered SMS Headers and Templates were misused.<\/li>\n<li>The credentials were used to send SMS traffic for an international brand\/entity without your authorisation.<\/li>\n<li>The misuse was identified based on information shared by the telecom operator.<\/li>\n<li>Sample logs and evidence provided by the operator should be attached to the complaint.<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">Only after reviewing these documents will the operator decide whether the blacklisted credentials can be restored.<\/p>\n<div>\n<hr \/>\n<\/div>\n<h1>Best Practices to Prevent Future ILDO Violations<\/h1>\n<ul data-spread=\"false\">\n<li>Never share your DLT login credentials with unauthorised users.<\/li>\n<li>Restrict API access using trusted server IP addresses.<\/li>\n<li>Rotate API keys periodically.<\/li>\n<li>Monitor SMS traffic regularly for unusual activity.<\/li>\n<li>Use strong passwords and enable additional security wherever possible.<\/li>\n<li>Immediately report any suspicious activity to your SMS provider and DLT operator.<\/li>\n<\/ul>\n<div>\n<hr \/>\n<\/div>\n<h1>Important Note<\/h1>\n<p>While communicating with your telecom operator regarding ILDO blacklisting or whitelisting, please keep <a href=\"mailto:support@fast2sms.com\"><strong>support@fast2sms.com<\/strong><\/a> in <strong>CC,<\/strong> so our support team can coordinate with the operator and assist you throughout the resolution process.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is ILDO Traffic? ILDO (International Long Distance Operator) leakage occurs when SMS traffic intended for international brands or entities is sent using DLT-approved Headers, Templates, or Entity credentials that are authorised only for domestic (India) messaging. In simple terms, this means that your DLT credentials have either been compromised or misused to send SMS [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","footnotes":""},"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ILDO Traffic \u2013 Header &amp; Template Blacklisting by DLT<\/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:\/\/www.fast2sms.com\/help\/ildo-traffic-header-template-blacklisting-by-dlt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ILDO Traffic \u2013 Header &amp; Template Blacklisting by DLT\" \/>\n<meta property=\"og:description\" content=\"What is ILDO Traffic? 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