{"id":1491,"date":"2026-04-28T15:41:11","date_gmt":"2026-04-28T15:41:11","guid":{"rendered":"https:\/\/www.vos3000.com\/blog\/?p=1491"},"modified":"2026-04-28T15:41:21","modified_gmt":"2026-04-28T15:41:21","slug":"vos3000-malicious-caller-blacklist","status":"publish","type":"post","link":"https:\/\/www.vos3000.com\/blog\/vos3000-malicious-caller-blacklist\/","title":{"rendered":"VOS3000 Malicious Caller Blacklist: Effective SS_BLACK_LIST_CALLER_MALICIOUS_CALL"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-malicious-caller-blacklist-effective-ss-black-list-caller-malicious-call\">VOS3000 Malicious Caller Blacklist: Effective SS_BLACK_LIST_CALLER_MALICIOUS_CALL<\/h1>\n\n\n\n<p>\ud83d\udcde Fraudulent and abusive callers can drain revenue, overload gateway ports, and degrade call quality for legitimate users. The <strong>VOS3000 malicious caller blacklist<\/strong> \u2014 powered by <strong>SS_BLACK_LIST_CALLER_MALICIOUS_CALL<\/strong> parameters \u2014 automatically identifies and blocks callers flagged as malicious, providing an essential layer of defense that complements manual blacklisting in your VoIP softswitch deployment. \ud83d\udee1\ufe0f<\/p>\n\n\n\n<p>\u2699\ufe0f Unlike static blacklist entries that require manual configuration for each offending number, the <strong>VOS3000 malicious caller blacklist<\/strong> operates dynamically. The softswitch monitors call patterns in real time, and when a caller&#8217;s behavior matches the malicious call criteria \u2014 such as exceeding a threshold of call attempts within a monitoring window \u2014 VOS3000 automatically adds that number to the dynamic blacklist for a configurable duration. This automated response means your system can react to fraud attacks within seconds, even when your operations team is offline. \ud83d\udd27<\/p>\n\n\n\n<p>\ud83c\udfaf This guide covers every parameter that controls the VOS3000 malicious caller blacklist: SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL (monitor cycle), SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE (block duration), and SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT (call threshold). We will walk through each parameter&#8217;s default value, recommended configuration, and how they work together to protect your VoIP network. Need expert help? WhatsApp us at <strong>+8801911119966<\/strong> for professional VOS3000 security configuration. \ud83d\udcde<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#vos-3000-malicious-caller-blacklist-effective-ss-black-list-caller-malicious-call\">VOS3000 Malicious Caller Blacklist: Effective SS_BLACK_LIST_CALLER_MALICIOUS_CALL<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-the-vos-3000-malicious-caller-blacklist\">\ud83d\udd10 What Is the VOS3000 Malicious Caller Blacklist?<\/a><ul><li><a href=\"#\ud83d\udccb-dynamic-blacklist-types-in-vos-3000\">\ud83d\udccb Dynamic Blacklist Types in VOS3000<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-ss-black-list-caller-malicious-call-parameters\">\u2699\ufe0f SS_BLACK_LIST_CALLER_MALICIOUS_CALL Parameters<\/a><ul><li><a href=\"#\ud83d\udccb-parameter-1-check-interval-ss-black-list-caller-malicious-call-check-interval\">\ud83d\udccb Parameter 1: Check Interval \u2014 SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL<\/a><\/li><li><a href=\"#\ud83d\udccb-parameter-2-expire-duration-ss-black-list-caller-malicious-call-expire\">\ud83d\udccb Parameter 2: Expire Duration \u2014 SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE<\/a><\/li><li><a href=\"#\ud83d\udccb-parameter-3-call-limit-ss-black-list-caller-malicious-call-limit\">\ud83d\udccb Parameter 3: Call Limit \u2014 SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udda5\ufe0f-how-the-vos-3000-malicious-caller-blacklist-detection-works\">\ud83d\udda5\ufe0f How the VOS3000 Malicious Caller Blacklist Detection Works<\/a><\/li><li><a href=\"#\ud83d\udccb-step-by-step-vos-3000-malicious-caller-blacklist-configuration\">\ud83d\udccb Step-by-Step VOS3000 Malicious Caller Blacklist Configuration<\/a><ul><li><a href=\"#step-1-access-system-parameters-\ud83c\udf10\">Step 1: Access System Parameters \ud83c\udf10<\/a><\/li><li><a href=\"#step-2-set-the-call-limit-threshold-\ud83c\udfaf\">Step 2: Set the Call Limit Threshold \ud83c\udfaf<\/a><\/li><li><a href=\"#step-3-configure-the-check-interval-\u23f1\ufe0f\">Step 3: Configure the Check Interval \u23f1\ufe0f<\/a><\/li><li><a href=\"#step-4-set-the-expire-duration-\ud83d\udd50\">Step 4: Set the Expire Duration \ud83d\udd50<\/a><\/li><li><a href=\"#step-5-verify-dynamic-blacklist-entries-\ud83d\udd0d\">Step 5: Verify Dynamic Blacklist Entries \ud83d\udd0d<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udee1\ufe0f-recommended-vos-3000-malicious-caller-blacklist-settings-by-deployment-type\">\ud83d\udee1\ufe0f Recommended VOS3000 Malicious Caller Blacklist Settings by Deployment Type<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-vos-3000-malicious-caller-blacklist-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 Malicious Caller Blacklist Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-malicious-caller-blacklist-not-working-no-entries-in-dynamic-blacklist\">\u274c Problem 1: Malicious Caller Blacklist Not Working \u2014 No Entries in Dynamic Blacklist<\/a><\/li><li><a href=\"#\u274c-problem-2-legitimate-high-volume-callers-getting-blacklisted\">\u274c Problem 2: Legitimate High-Volume Callers Getting Blacklisted<\/a><\/li><li><a href=\"#\u274c-problem-3-blacklist-entries-expiring-too-quickly-repeat-offenders-return\">\u274c Problem 3: Blacklist Entries Expiring Too Quickly \u2014 Repeat Offenders Return<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udca1-vos-3000-malicious-caller-blacklist-best-practices\">\ud83d\udca1 VOS3000 Malicious Caller Blacklist Best Practices<\/a><\/li><li><a href=\"#\ud83d\udcca-complete-vos-3000-malicious-caller-blacklist-parameter-reference\">\ud83d\udcca Complete VOS3000 Malicious Caller Blacklist Parameter Reference<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-the-vos-3000-malicious-caller-blacklist\">\u2753 What is the VOS3000 malicious caller blacklist?<\/a><\/li><li><a href=\"#\u2753-why-is-the-vos-3000-malicious-caller-blacklist-not-working-by-default\">\u2753 Why is the VOS3000 malicious caller blacklist not working by default?<\/a><\/li><li><a href=\"#\u2753-how-does-the-check-interval-affect-malicious-caller-detection\">\u2753 How does the check interval affect malicious caller detection?<\/a><\/li><li><a href=\"#\u2753-what-happens-when-a-caller-is-added-to-the-malicious-caller-blacklist\">\u2753 What happens when a caller is added to the malicious caller blacklist?<\/a><\/li><li><a href=\"#\u2753-how-is-the-malicious-caller-blacklist-different-from-a-static-blacklist\">\u2753 How is the malicious caller blacklist different from a static blacklist?<\/a><\/li><li><a href=\"#\u2753-can-i-adjust-the-malicious-caller-blacklist-parameters-without-restarting-vos-3000\">\u2753 Can I adjust the malicious caller blacklist parameters without restarting VOS3000?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-expert-help-with-vos-3000-malicious-caller-blacklist\">\ud83d\udcde Need Expert Help with VOS3000 Malicious Caller Blacklist?<\/a><\/li><li><a href=\"#\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd10-what-is-the-vos-3000-malicious-caller-blacklist\">\ud83d\udd10 What Is the VOS3000 Malicious Caller Blacklist?<\/h2>\n\n\n\n<p>\u23f1\ufe0f The <strong>VOS3000 malicious caller blacklist<\/strong> is a dynamic blacklist system that automatically identifies and blocks caller numbers exhibiting malicious call behavior. According to the official VOS3000 2.1.9.07 manual \u00a74.3.5.2, the malicious caller blacklist is part of the broader dynamic black list feature that also covers no-answer and concurrent call abuse scenarios. The malicious caller type specifically targets numbers that make an excessive number of call attempts within a defined monitoring window. \ud83d\udcde<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Why a malicious caller blacklist matters:<\/strong> In wholesale VoIP operations, malicious callers can cause significant financial damage through SIM-box fraud, traffic pumping, and toll fraud schemes. Without automated detection and blocking, these attacks can persist for hours before a human operator notices and intervenes. The VOS3000 malicious caller blacklist eliminates this vulnerability by responding automatically within the configured check interval.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udce1 Detects callers making excessive call attempts in a short period<\/li>\n\n\n\n<li>\ud83d\udd04 Automatically adds flagged numbers to the dynamic blacklist<\/li>\n\n\n\n<li>\ud83d\udcca Blocks all subsequent calls from the blacklisted number for the configured duration<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f Complements manual blacklist entries for defense-in-depth protection<\/li>\n\n\n\n<li>\ud83c\udfaf Operates independently per softswitch node in clustered deployments<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udccd <strong>Location in VOS3000 Client:<\/strong> Navigation \u2192 Number management \u2192 Dynamic black list (view only); Configuration via Navigation \u2192 Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 System parameter<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-dynamic-blacklist-types-in-vos-3000\">\ud83d\udccb Dynamic Blacklist Types in VOS3000<\/h3>\n\n\n\n<p>\ud83c\udf10 The VOS3000 malicious caller blacklist is one of three dynamic blacklist types. Understanding the differences is essential for comprehensive fraud prevention:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Blacklist Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Trigger<\/th><th class=\"has-text-align-left\" data-align=\"left\">Default Expire<\/th><th class=\"has-text-align-left\" data-align=\"left\">Target<\/th><\/tr><tr><td>\ud83d\udd34 Malicious Caller<\/td><td>Excessive call attempts within monitor window<\/td><td>3600 seconds<\/td><td>Calling number (caller)<\/td><\/tr><tr><td>\ud83d\udfe1 No Answer<\/td><td>Repeated no-answer events<\/td><td>2 days<\/td><td>Called number (callee)<\/td><\/tr><tr><td>\ud83d\udfe0 Concurrent Abuse<\/td><td>Exceeds concurrent call limit<\/td><td>86400 seconds<\/td><td>Calling number (caller)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udd11 <strong>Key distinction:<\/strong> The malicious caller blacklist targets the <em>calling<\/em> party \u2014 the number originating the excessive calls. The no-answer blacklist targets the <em>called<\/em> party \u2014 numbers that fail to answer. The concurrent abuse blacklist also targets the caller but focuses on simultaneous call volume rather than total call attempts. For broader security, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-dynamic-blacklist-anti-fraud\/\" target=\"_blank\" rel=\"noopener\">dynamic blacklist anti-fraud guide<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-ss-black-list-caller-malicious-call-parameters\">\u2699\ufe0f SS_BLACK_LIST_CALLER_MALICIOUS_CALL Parameters<\/h2>\n\n\n\n<p>\ud83d\udd27 The VOS3000 malicious caller blacklist is controlled by three core parameters documented in the official manual \u00a74.3.5.2. These parameters define how the system detects malicious behavior, how long the block lasts, and what threshold triggers the blacklisting.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-parameter-1-check-interval-ss-black-list-caller-malicious-call-check-interval\">\ud83d\udccb Parameter 1: Check Interval \u2014 SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Attribute<\/th><th class=\"has-text-align-left\" data-align=\"left\">Value<\/th><\/tr><tr><td>\ud83d\udccc Parameter Name<\/td><td>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL<\/td><\/tr><tr><td>\ud83d\udd22 Default Value<\/td><td>600<\/td><\/tr><tr><td>\ud83d\udcd0 Unit<\/td><td>Seconds<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>Malicious call dynamic caller black list monitor cycle<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>How the check interval works:<\/strong> The check interval defines how frequently VOS3000 evaluates caller behavior against the malicious call threshold. With the default of 600 seconds (10 minutes), VOS3000 reviews call counts for each caller number within every 10-minute window. If a caller&#8217;s total call attempts during that window exceed the configured limit, the number is added to the dynamic blacklist. A shorter check interval means faster detection but higher CPU usage; a longer interval provides more tolerance before flagging.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-parameter-2-expire-duration-ss-black-list-caller-malicious-call-expire\">\ud83d\udccb Parameter 2: Expire Duration \u2014 SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Attribute<\/th><th class=\"has-text-align-left\" data-align=\"left\">Value<\/th><\/tr><tr><td>\ud83d\udccc Parameter Name<\/td><td>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE<\/td><\/tr><tr><td>\ud83d\udd22 Default Value<\/td><td>3600<\/td><\/tr><tr><td>\ud83d\udcd0 Unit<\/td><td>Seconds<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>Malicious call dynamic caller black list expired duration<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>How the expire duration works:<\/strong> Once a number is added to the VOS3000 malicious caller blacklist, it remains blocked for the duration specified by this parameter. After the expire duration passes, the number is automatically removed from the dynamic blacklist and can make calls again. The default of 3600 seconds (1 hour) provides a reasonable balance \u2014 long enough to stop an active attack but not so long that a legitimate user is permanently blocked after a temporary anomaly. For persistent offenders, you should add them to the static <a href=\"https:\/\/multahost.com\/blog\/vos3000-security-anti-fraud\/\" target=\"_blank\" rel=\"noopener\">security anti-fraud<\/a> configuration.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-parameter-3-call-limit-ss-black-list-caller-malicious-call-limit\">\ud83d\udccb Parameter 3: Call Limit \u2014 SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Attribute<\/th><th class=\"has-text-align-left\" data-align=\"left\">Value<\/th><\/tr><tr><td>\ud83d\udccc Parameter Name<\/td><td>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT<\/td><\/tr><tr><td>\ud83d\udd22 Default Value<\/td><td>None<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>Malicious call dynamic caller black list max call times<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u26a0\ufe0f <strong>Critical note:<\/strong> The default value of <strong>None<\/strong> means the malicious caller blacklist is effectively disabled by default. You must configure a numeric limit to activate this feature. Without a limit, VOS3000 will never flag any caller as malicious regardless of how many calls they make. This is a common oversight \u2014 operators assume the feature is active but never set the limit threshold.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udda5\ufe0f-how-the-vos-3000-malicious-caller-blacklist-detection-works\">\ud83d\udda5\ufe0f How the VOS3000 Malicious Caller Blacklist Detection Works<\/h2>\n\n\n\n<p>\ud83d\udd04 Understanding the detection flow is essential for configuring the right thresholds. The VOS3000 malicious caller blacklist uses a sliding window monitoring approach:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\ud83d\udcde VOS3000 Malicious Caller Blacklist Detection Flow:\n\nCaller A makes calls through VOS3000\n    \u2502\n    \u251c\u2500\u2500 Every CHECK_INTERVAL (600s default):\n    \u2502   \u2502\n    \u2502   \u251c\u2500\u2500 Count total call attempts by Caller A\n    \u2502   \u2502   in the current monitoring window\n    \u2502   \u2502\n    \u2502   \u251c\u2500\u2500 Compare count against MALICIOUS_CALL_LIMIT\n    \u2502   \u2502   \u2502\n    \u2502   \u2502   \u251c\u2500\u2500 Count &lt; LIMIT  \u2192  \u2705 No action\n    \u2502   \u2502   \u2502   Caller continues normally\n    \u2502   \u2502   \u2502\n    \u2502   \u2502   \u2514\u2500\u2500 Count &gt;= LIMIT  \u2192  \ud83d\udd34 FLAGGED!\n    \u2502   \u2502       \u2502\n    \u2502   \u2502       \u251c\u2500\u2500 Add Caller A to Dynamic Blacklist\n    \u2502   \u2502       \u2502   Type: Malicious Call\n    \u2502   \u2502       \u2502\n    \u2502   \u2502       \u251c\u2500\u2500 Block duration = MALICIOUS_CALL_EXPIRE\n    \u2502   \u2502       \u2502   (3600s default = 1 hour)\n    \u2502   \u2502       \u2502\n    \u2502   \u2502       \u2514\u2500\u2500 All subsequent calls from Caller A\n    \u2502   \u2502           are rejected during block period\n    \u2502   \u2502\n    \u2502   \u2514\u2500\u2500 After EXPIRE duration passes:\n    \u2502       \u2514\u2500\u2500 Remove Caller A from Dynamic Blacklist\n    \u2502           Caller can make calls again\n    \u2502\n    \u2514\u2500\u2500 \ud83d\udcca Entry visible in: Navigation &gt; Number management\n        &gt; Dynamic black list\n<\/pre>\n\n\n\n<p>\ud83d\udca1 <strong>Practical example:<\/strong> If you set SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT to 100 and SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL to 600, then any caller making 100 or more call attempts within a 10-minute window will be automatically blacklisted for the configured expire duration. This effectively stops SIM-box operations and automated dialing attacks while allowing normal high-volume legitimate users to continue operating. For related security measures, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-security\/\" target=\"_blank\" rel=\"noopener\">VOS3000 security guide<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-step-by-step-vos-3000-malicious-caller-blacklist-configuration\">\ud83d\udccb Step-by-Step VOS3000 Malicious Caller Blacklist Configuration<\/h2>\n\n\n\n<p>\ud83d\udda5\ufe0f Follow these steps to configure the VOS3000 malicious caller blacklist, based on the VOS3000 2.1.9.07 manual \u00a74.3.5.2:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-access-system-parameters-\ud83c\udf10\">Step 1: Access System Parameters \ud83c\udf10<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udd10 Log in to VOS3000 Client<\/li>\n\n\n\n<li>\ud83d\udccc Navigate: <strong>Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 System parameter<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Locate the SS_BLACK_LIST_CALLER_MALICIOUS_CALL group in the parameter list<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-set-the-call-limit-threshold-\ud83c\udfaf\">Step 2: Set the Call Limit Threshold \ud83c\udfaf<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcdd Find <strong>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT<\/strong><\/li>\n\n\n\n<li>\u270f\ufe0f Set the maximum number of call attempts that triggers blacklisting (e.g., 100 for high-volume, 30 for retail)<\/li>\n\n\n\n<li>\u26a0\ufe0f <strong>Important:<\/strong> The default is None (disabled). You MUST set a value to activate the feature<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-3-configure-the-check-interval-\u23f1\ufe0f\">Step 3: Configure the Check Interval \u23f1\ufe0f<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcdd Find <strong>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL<\/strong><\/li>\n\n\n\n<li>\u270f\ufe0f Set the monitoring window in seconds (default: 600)<\/li>\n\n\n\n<li>\ud83d\udca1 Shorter intervals detect attacks faster but may flag legitimate burst traffic<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-4-set-the-expire-duration-\ud83d\udd50\">Step 4: Set the Expire Duration \ud83d\udd50<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcdd Find <strong>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE<\/strong><\/li>\n\n\n\n<li>\u270f\ufe0f Set the blacklist duration in seconds (default: 3600)<\/li>\n\n\n\n<li>\ud83d\udcbe Save and apply the configuration<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-5-verify-dynamic-blacklist-entries-\ud83d\udd0d\">Step 5: Verify Dynamic Blacklist Entries \ud83d\udd0d<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udccb Navigate: <strong>Number management \u2192 Dynamic black list<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Check that flagged numbers appear with Type = &#8220;Malicious call&#8221;<\/li>\n\n\n\n<li>\ud83d\udcca Verify the Effective date and Expiration time are correct<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-recommended-vos-3000-malicious-caller-blacklist-settings-by-deployment-type\">\ud83d\udee1\ufe0f Recommended VOS3000 Malicious Caller Blacklist Settings by Deployment Type<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Deployment Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Call Limit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Check Interval<\/th><th class=\"has-text-align-left\" data-align=\"left\">Expire Duration<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rationale<\/th><\/tr><tr><td>\ud83c\udfe2 Retail \/ Calling Card<\/td><td>30-50<\/td><td>600s<\/td><td>3600s<\/td><td>\u2705 Lower limit; retail users rarely exceed 30 calls\/10min<\/td><\/tr><tr><td>\ud83c\udf10 Wholesale<\/td><td>100-200<\/td><td>600s<\/td><td>7200s<\/td><td>\ud83d\udd27 Higher limit for legitimate high-CPS; longer block for fraud<\/td><\/tr><tr><td>\ud83d\udce1 High-CPS Carrier<\/td><td>300-500<\/td><td>300s<\/td><td>3600s<\/td><td>\ud83d\udce1 Very high limit; shorter interval for faster detection<\/td><\/tr><tr><td>\u26a0\ufe0f Fraud-Prone Routes<\/td><td>50<\/td><td>300s<\/td><td>86400s<\/td><td>\ud83d\udee1\ufe0f Aggressive blocking; 24-hour ban for offenders<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>Pro tip:<\/strong> Always analyze your normal call patterns before setting the malicious call limit. If your typical wholesale customer makes 80 calls per 10 minutes, setting the limit to 50 would generate false positives. Use the <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-analysis\/\" target=\"_blank\" rel=\"noopener\">call analysis<\/a> tools to establish baseline CPS per caller before configuring threshold values. WhatsApp us at <strong>+8801911119966<\/strong> for assistance with threshold tuning. \ud83d\udd27<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-vos-3000-malicious-caller-blacklist-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 Malicious Caller Blacklist Problems and Solutions<\/h2>\n\n\n\n<p>\u26a0\ufe0f Misconfigured malicious caller blacklist settings can either leave your system vulnerable or block legitimate users. Here are the most common problems and their solutions:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-malicious-caller-blacklist-not-working-no-entries-in-dynamic-blacklist\">\u274c Problem 1: Malicious Caller Blacklist Not Working \u2014 No Entries in Dynamic Blacklist<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> Known abusive callers continue making calls, but the dynamic blacklist table shows no entries for malicious calls.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT is still set to its default value of None, which effectively disables the feature.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Set SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT to a numeric value (e.g., 100)<\/li>\n\n\n\n<li>\ud83d\udcca Verify the check interval and expire duration are also configured<\/li>\n\n\n\n<li>\ud83d\udcde Restart the softswitch service after parameter changes if required by your version<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-legitimate-high-volume-callers-getting-blacklisted\">\u274c Problem 2: Legitimate High-Volume Callers Getting Blacklisted<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> Regular wholesale customers are being added to the dynamic blacklist as malicious callers, disrupting their service.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The call limit threshold is set too low for the actual call volume of your customers, causing false positives.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Increase SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT to accommodate peak CPS<\/li>\n\n\n\n<li>\ud83d\udcca Analyze CDR data to determine the maximum call rate for your top customers<\/li>\n\n\n\n<li>\ud83d\udcde Consider adding trusted customer IPs to the <a href=\"https:\/\/multahost.com\/blog\/illegal-call-in-vos3000-server-how-to-stop-illegal-call-is-it-important\/\" target=\"_blank\" rel=\"noopener\">illegal call prevention<\/a> whitelist<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-blacklist-entries-expiring-too-quickly-repeat-offenders-return\">\u274c Problem 3: Blacklist Entries Expiring Too Quickly \u2014 Repeat Offenders Return<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> A flagged malicious caller is unblocked after a short period and immediately resumes abusive calling patterns.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The expire duration (SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE) is too short for persistent attackers.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Increase the expire duration to 86400 seconds (24 hours) for known fraud routes<\/li>\n\n\n\n<li>\ud83d\udcca For persistent offenders, add them to the static blacklist manually<\/li>\n\n\n\n<li>\ud83d\udcde Combine with <a href=\"https:\/\/multahost.com\/blog\/vos3000-iptables-sip-scanner-block\/\" target=\"_blank\" rel=\"noopener\">iptables SIP scanner blocking<\/a> for network-level protection<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udca1-vos-3000-malicious-caller-blacklist-best-practices\">\ud83d\udca1 VOS3000 Malicious Caller Blacklist Best Practices<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Best Practice<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommendation<\/th><th class=\"has-text-align-left\" data-align=\"left\">Reason<\/th><\/tr><tr><td>\ud83d\udcca Analyze before configuring<\/td><td>Review CDR data for baseline CPS per caller<\/td><td>\u2705 Prevents false positives<\/td><\/tr><tr><td>\ud83d\udd27 Always set a limit<\/td><td>Never leave LIMIT at None in production<\/td><td>\ud83d\udee1\ufe0f Feature is disabled by default<\/td><\/tr><tr><td>\ud83d\udccb Monitor the blacklist table<\/td><td>Check Dynamic black list daily for entries<\/td><td>\ud83d\udcde Identifies emerging attack patterns<\/td><\/tr><tr><td>\ud83d\udd04 Use layered defense<\/td><td>Combine dynamic + static blacklist + firewall<\/td><td>\ud83d\udee1\ufe0f No single measure is sufficient<\/td><\/tr><tr><td>\u23f1\ufe0f Tune expire duration<\/td><td>Longer for fraud routes, shorter for retail<\/td><td>\ud83d\udd27 Balances security and accessibility<\/td><\/tr><tr><td>\ud83d\udcc8 Test threshold changes<\/td><td>Run test calls after any limit adjustment<\/td><td>\ud83d\udd0d Verifies no impact on legitimate traffic<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-complete-vos-3000-malicious-caller-blacklist-parameter-reference\">\ud83d\udcca Complete VOS3000 Malicious Caller Blacklist Parameter Reference<\/h2>\n\n\n\n<p>\ud83d\udccb Here is the complete reference table for all parameters related to the malicious caller blacklist, sourced from the official VOS3000 2.1.9.07 manual \u00a74.3.5.2:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Default<\/th><th class=\"has-text-align-left\" data-align=\"left\">Unit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Purpose<\/th><\/tr><tr><td>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL<\/td><td>600<\/td><td>Seconds<\/td><td>Monitor cycle \u2014 how often to evaluate caller behavior<\/td><\/tr><tr><td>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE<\/td><td>3600<\/td><td>Seconds<\/td><td>Duration to keep caller in dynamic blacklist<\/td><\/tr><tr><td>SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT<\/td><td>None<\/td><td>Count<\/td><td>Max call attempts before flagging as malicious<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-vos-3000-malicious-caller-blacklist\">\u2753 What is the VOS3000 malicious caller blacklist?<\/h3>\n\n\n\n<p>\u23f1\ufe0f The <strong>VOS3000 malicious caller blacklist<\/strong> is a dynamic, automated blacklist feature that identifies and blocks caller numbers making excessive call attempts within a configurable monitoring window. When a caller exceeds the defined call threshold during the check interval, VOS3000 automatically adds that number to the dynamic blacklist for a configured duration. This feature is controlled by three parameters: SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT (threshold), SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL (monitor cycle), and SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE (block duration). It is documented in the VOS3000 2.1.9.07 manual \u00a74.3.5.2.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-why-is-the-vos-3000-malicious-caller-blacklist-not-working-by-default\">\u2753 Why is the VOS3000 malicious caller blacklist not working by default?<\/h3>\n\n\n\n<p>\ud83d\udd27 The <strong>VOS3000 malicious caller blacklist<\/strong> is effectively disabled by default because the SS_BLACK_LIST_CALLER_MALICIOUS_CALL_LIMIT parameter has a default value of <strong>None<\/strong>. Without a numeric limit, VOS3000 never flags any caller as malicious regardless of their call volume. To activate the feature, you must set a numeric value for the limit parameter \u2014 for example, 100 calls per monitoring window. The check interval (600s) and expire duration (3600s) have functional defaults, but the limit must be explicitly configured.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-does-the-check-interval-affect-malicious-caller-detection\">\u2753 How does the check interval affect malicious caller detection?<\/h3>\n\n\n\n<p>\ud83d\udcca The check interval (SS_BLACK_LIST_CALLER_MALICIOUS_CALL_CHECK_INTERVAL) defines the monitoring window during which VOS3000 counts call attempts per caller. With the default of 600 seconds, the system evaluates each caller&#8217;s total calls within every 10-minute period. If a caller makes more calls than the configured limit within any single check interval, they are flagged as malicious. A shorter interval (e.g., 300s) detects attacks faster but may generate false positives during legitimate traffic bursts. A longer interval provides more tolerance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-happens-when-a-caller-is-added-to-the-malicious-caller-blacklist\">\u2753 What happens when a caller is added to the malicious caller blacklist?<\/h3>\n\n\n\n<p>\ud83d\udee1\ufe0f When a caller is added to the <strong>VOS3000 malicious caller blacklist<\/strong>, all subsequent call attempts from that number are rejected by the softswitch. The caller remains blocked for the duration specified by SS_BLACK_LIST_CALLER_MALICIOUS_CALL_EXPIRE (default: 3600 seconds). The blocked entry is visible in the Dynamic black list table under Number management, showing the phone number, type (Malicious call), effective date, and expiration time. Once the expire duration passes, the number is automatically removed and can make calls again.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-is-the-malicious-caller-blacklist-different-from-a-static-blacklist\">\u2753 How is the malicious caller blacklist different from a static blacklist?<\/h3>\n\n\n\n<p>\ud83d\udccb The <strong>VOS3000 malicious caller blacklist<\/strong> is dynamic \u2014 it automatically adds and removes entries based on real-time call behavior, without manual intervention. Entries have an expiration time after which they are automatically deleted. A static blacklist, by contrast, requires manual entry of each number and remains in effect indefinitely until manually removed. The dynamic blacklist is ideal for responding to automated attacks in real time, while the static blacklist is better for permanently blocking known fraud numbers. Both should be used together for comprehensive <a href=\"https:\/\/multahost.com\/blog\/vos3000-security-anti-hack-fraud\/\" target=\"_blank\" rel=\"noopener\">anti-fraud protection<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-adjust-the-malicious-caller-blacklist-parameters-without-restarting-vos-3000\">\u2753 Can I adjust the malicious caller blacklist parameters without restarting VOS3000?<\/h3>\n\n\n\n<p>\u2699\ufe0f In most VOS3000 deployments, changes to the system parameters under Softswitch management \u2192 Additional settings take effect after saving, without requiring a full service restart. However, some parameter changes may require reloading the softswitch configuration. It is recommended to test parameter changes in a maintenance window and verify the dynamic blacklist entries appear as expected. Always monitor the <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-termination-reasons\/\" target=\"_blank\" rel=\"noopener\">call termination reasons<\/a> after configuration changes to ensure legitimate traffic is not affected. For expert assistance, reach us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udcde<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-expert-help-with-vos-3000-malicious-caller-blacklist\">\ud83d\udcde Need Expert Help with VOS3000 Malicious Caller Blacklist?<\/h2>\n\n\n\n<p>\ud83d\udd27 Proper <strong>VOS3000 malicious caller blacklist<\/strong> configuration is essential for protecting your VoIP network from fraud, traffic pumping, and abusive calling patterns. Whether you need help setting threshold values, tuning check intervals, or integrating the dynamic blacklist with your overall security strategy, our team is ready to assist. Reach us on WhatsApp at <strong>+8801911119966<\/strong> for professional VOS3000 security configuration and anti-fraud services. \ud83d\udcde<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/h2>\n\n\n\n<p>For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/p>\n\n\n\n<p>\ud83d\udcf1 <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a><br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.vos3000.com\">www.vos3000.com<\/a><br>\ud83c\udf10 <strong>Blog:<\/strong> <a href=\"https:\/\/multahost.com\/blog\" target=\"_blank\" rel=\"noopener\">multahost.com\/blog<\/a><br>\ud83d\udce5 <strong>Downloads:<\/strong> <a href=\"https:\/\/www.vos3000.com\/downloads.php\">VOS3000 Downloads<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-768x1024.png\" alt=\"VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Period Capacity Configuration, VOS3000 Period Dial Plan, VOS3000 RTP Interrupt Detection, VOS3000 Lowest Profit Rate Limit, VOS3000 Max Minute Rate Cap, VOS3000 Sort Lowest Rate Per Second, VOS3000 Check Rate Before Routing, VOS3000 Sort by Lowest Rate, VOS3000 Bilateral Reconciliation, VOS3000 SIP OPTIONS Online Check, VOS3000 T38 Fax Over IP, VOS3000 G729 Annex B Silence, VOS3000 Gateway Group Reserved Lines, VOS3000 Auxiliary Ring Tone, VOS3000 Black White List Groups, VOS3000 System White List, VOS3000 Callee Balance Verification, VOS3000 Dial Plan Wildcards, VOS3000 Number Length Matching, VOS3000 Random Routing Patterns, VOS3000 Position Keeper Dollar, VOS3000 LRN Number Portability, VOS3000 LRN Numbers\"><\/td><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-768x1024.png\" alt=\"VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Period Capacity Configuration, VOS3000 Period Dial Plan, VOS3000 RTP Interrupt Detection, VOS3000 Lowest Profit Rate Limit, VOS3000 Max Minute Rate Cap, VOS3000 Sort Lowest Rate Per Second, VOS3000 Check Rate Before Routing, VOS3000 Sort by Lowest Rate, VOS3000 Bilateral Reconciliation, VOS3000 SIP OPTIONS Online Check, VOS3000 T38 Fax Over IP, VOS3000 G729 Annex B Silence, VOS3000 Gateway Group Reserved Lines, VOS3000 Auxiliary Ring Tone, VOS3000 Black White List Groups, VOS3000 System White List, VOS3000 Callee Balance Verification, VOS3000 Dial Plan Wildcards, VOS3000 Number Length Matching, VOS3000 Random Routing Patterns, VOS3000 Position Keeper Dollar, VOS3000 LRN Number Portability, VOS3000 LRN Numbers\"><\/td><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-768x1024.png\" alt=\"VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Gateway Switch Limit, VOS3000 RTP Lock-In, VOS3000 Aggressive Gateway Failover, VOS3000 Busy Stop Switch, VOS3000 real-time gateway ASR, VOS3000 ASR Cost Routing, VOS3000 Prefix Mode Extension, VOS3000 Period Capacity Configuration, VOS3000 Period Dial Plan, VOS3000 RTP Interrupt Detection, VOS3000 Lowest Profit Rate Limit, VOS3000 Max Minute Rate Cap, VOS3000 Sort Lowest Rate Per Second, VOS3000 Check Rate Before Routing, VOS3000 Sort by Lowest Rate, VOS3000 Bilateral Reconciliation, VOS3000 SIP OPTIONS Online Check, VOS3000 T38 Fax Over IP, VOS3000 G729 Annex B Silence, VOS3000 Gateway Group Reserved Lines, VOS3000 Auxiliary Ring Tone, VOS3000 Black White List Groups, VOS3000 System White List, VOS3000 Callee Balance Verification, VOS3000 Dial Plan Wildcards, VOS3000 Number Length Matching, VOS3000 Random Routing Patterns, VOS3000 Position Keeper Dollar, VOS3000 LRN Number Portability, VOS3000 LRN Numbers\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 malicious caller blacklist with SS_BLACK_LIST_CALLER_MALICIOUS_CALL. Configure auto-blacklist for flagged callers, block duration, and fraud 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