{"id":3268,"date":"2026-04-26T05:51:50","date_gmt":"2026-04-26T05:51:50","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3268"},"modified":"2026-04-26T06:04:43","modified_gmt":"2026-04-26T06:04:43","slug":"vos3000-cdr-query","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-cdr-query\/","title":{"rendered":"VOS3000 CDR Query Blackout Secure Deny Time Configuration"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-cdr-query-blackout-secure-deny-time-configuration\">VOS3000 CDR Query Blackout Secure Deny Time Configuration<\/h1>\n\n\n\n<p>\ud83d\udd12 Imagine this scenario: your billing team is running the end-of-month reconciliation, processing millions of CDR records to generate invoices, when a reseller launches a massive CDR query that consumes database resources and slows the entire billing run to a crawl. The <strong>VOS3000 CDR query blackout<\/strong> feature, controlled by <strong>SERVER_QUERY_CDR_DENY_TIME<\/strong>, prevents exactly this situation by blocking CDR queries during specified hours \u2014 protecting your database during critical billing windows, maintenance periods, and peak processing times. \u23f1\ufe0f<\/p>\n\n\n\n<p>\ud83d\udcca The VOS3000 CDR query blackout is a server-level parameter that defines specific hours of the day when CDR queries are denied to all users through the VOS3000 Client and web interface. During these blackout hours, any attempt to query CDR records returns a restriction notice instead of results. This ensures that database resources remain fully available for billing calculations, report generation, and system maintenance without interference from ad-hoc queries. \ud83d\udee1\ufe0f<\/p>\n\n\n\n<p>\ud83d\udcac Need to configure CDR access policies for your VOS3000 deployment? Contact our experts at <strong>WhatsApp: +8801911119966<\/strong> for professional assistance with billing security and system optimization. \ud83d\udca1<\/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-cdr-query-blackout-secure-deny-time-configuration\">VOS3000 CDR Query Blackout Secure Deny Time Configuration<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-vos-3000-cdr-query-blackout\">\ud83d\udd10 What Is VOS3000 CDR Query Blackout?<\/a><\/li><li><a href=\"#\u2699\ufe0f-server-query-cdr-deny-time-the-core-parameter\">\u2699\ufe0f SERVER_QUERY_CDR_DENY_TIME \u2014 The Core Parameter<\/a><ul><li><a href=\"#\ud83d\udccb-vos-3000-cdr-query-blackout-configuration-examples\">\ud83d\udccb VOS3000 CDR Query Blackout Configuration Examples<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udccb-step-by-step-vos-3000-cdr-query-blackout-configuration\">\ud83d\udccb Step-by-Step VOS3000 CDR Query Blackout Configuration<\/a><ul><li><a href=\"#step-1-determine-blackout-window-\u23f1\ufe0f\">Step 1: Determine Blackout Window \u23f1\ufe0f<\/a><\/li><li><a href=\"#step-2-configure-the-parameter-\ud83d\udccc\">Step 2: Configure the Parameter \ud83d\udccc<\/a><\/li><li><a href=\"#step-3-verify-blackout-enforcement-\u2705\">Step 3: Verify Blackout Enforcement \u2705<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd04-vos-3000-cdr-query-blackout-and-related-parameters\">\ud83d\udd04 VOS3000 CDR Query Blackout and Related Parameters<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-vos-3000-cdr-query-blackout-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 CDR Query Blackout Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-cdr-queries-still-allowed-during-blackout-hours\">\u274c Problem 1: CDR Queries Still Allowed During Blackout Hours<\/a><\/li><li><a href=\"#\u274c-problem-2-blackout-applied-in-wrong-timezone\">\u274c Problem 2: Blackout Applied in Wrong Timezone<\/a><\/li><li><a href=\"#\u274c-problem-3-resellers-unable-to-access-cd-rs-during-business-hours\">\u274c Problem 3: Resellers Unable to Access CDRs During Business Hours<\/a><\/li><li><a href=\"#\u274c-problem-4-blackout-not-preventing-heavy-queries-outside-blackout-hours\">\u274c Problem 4: Blackout Not Preventing Heavy Queries Outside Blackout Hours<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udca1-vos-3000-cdr-query-blackout-best-practices\">\ud83d\udca1 VOS3000 CDR Query Blackout Best Practices<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-the-default-value-for-server-query-cdr-deny-time\">\u2753 What is the default value for SERVER_QUERY_CDR_DENY_TIME?<\/a><\/li><li><a href=\"#\u2753-does-the-vos-3000-cdr-query-blackout-apply-to-all-users\">\u2753 Does the VOS3000 CDR query blackout apply to all users?<\/a><\/li><li><a href=\"#\u2753-can-i-configure-different-blackout-windows-for-different-days-of-the-week\">\u2753 Can I configure different blackout windows for different days of the week?<\/a><\/li><li><a href=\"#\u2753-how-does-the-vos-3000-cdr-query-blackout-interact-with-automated-reports\">\u2753 How does the VOS3000 CDR query blackout interact with automated reports?<\/a><\/li><li><a href=\"#\u2753-what-happens-when-a-user-tries-to-query-cd-rs-during-the-blackout\">\u2753 What happens when a user tries to query CDRs during the blackout?<\/a><\/li><li><a href=\"#\u2753-can-i-temporarily-disable-the-blackout-for-emergency-cdr-access\">\u2753 Can I temporarily disable the blackout for emergency CDR access?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-expert-help-with-vos-3000-cdr-query-blackout\">\ud83d\udcde Need Expert Help with VOS3000 CDR Query Blackout?<\/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-vos-3000-cdr-query-blackout\">\ud83d\udd10 What Is VOS3000 CDR Query Blackout?<\/h2>\n\n\n\n<p>\ud83d\udccb The <strong>VOS3000 CDR query blackout<\/strong> is a time-based access control mechanism that restricts CDR queries during designated hours. When enabled, users cannot search, view, or export CDR records through the VOS3000 Client or web portal during the configured blackout window. This protects database performance during periods when the system needs maximum resources for internal processing. \ud83d\udeab<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Why carriers need CDR query blackout:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcb0 <strong>Billing run protection:<\/strong> Monthly reconciliation processes millions of CDRs \u2014 concurrent user queries can cause severe performance degradation<\/li>\n\n\n\n<li>\ud83d\udcca <strong>Report generation:<\/strong> Automated reports require exclusive database access to complete within acceptable timeframes<\/li>\n\n\n\n<li>\ud83d\udd27 <strong>Maintenance windows:<\/strong> Database optimization, index rebuilding, and data archival should not compete with query traffic<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f <strong>Data integrity:<\/strong> Prevents partial or inconsistent CDR views during data migration or settlement processing<\/li>\n\n\n\n<li>\ud83d\udccb <strong>Regulatory compliance:<\/strong> Some jurisdictions require controlled access to CDR data during audit periods<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-server-query-cdr-deny-time-the-core-parameter\">\u2699\ufe0f SERVER_QUERY_CDR_DENY_TIME \u2014 The Core Parameter<\/h2>\n\n\n\n<p>\ud83d\udd12 <strong>SERVER_QUERY_CDR_DENY_TIME<\/strong> defines the hours during which CDR queries are blocked. The parameter uses a 24-hour clock format, specifying which hours of the day are denied for CDR access. \ud83d\udccb<\/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\">Attribute<\/th><th class=\"has-text-align-left\" data-align=\"left\">Value<\/th><\/tr><tr><td>\ud83d\udccc Parameter Name<\/td><td>SERVER_QUERY_CDR_DENY_TIME<\/td><\/tr><tr><td>\ud83d\udd22 Default Value<\/td><td>None (no blackout by default)<\/td><\/tr><tr><td>\ud83d\udcd0 Format<\/td><td>Comma-separated hour values (24-hour format)<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>No CDR Query Time (24 hour) e.g. 18,19,20,21,22,23<\/td><\/tr><tr><td>\ud83d\udccd Location<\/td><td>Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 Server parameter<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udd27 <strong>Configuration format:<\/strong> The parameter accepts comma-separated integer values representing the hours of the day (0\u201323) when CDR queries are blocked. For example, to block CDR queries from 6 PM to midnight, set the value to: <code>18,19,20,21,22,23<\/code>. Each value represents one complete hour \u2014 setting &#8220;18&#8221; blocks queries from 18:00:00 to 18:59:59.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-vos-3000-cdr-query-blackout-configuration-examples\">\ud83d\udccb VOS3000 CDR Query Blackout Configuration Examples<\/h3>\n\n\n\n<p>\ud83d\udcca Here are practical examples showing how to configure the VOS3000 CDR query blackout for different operational scenarios: \ud83d\udca1<\/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\">Scenario<\/th><th class=\"has-text-align-left\" data-align=\"left\">Parameter Value<\/th><th class=\"has-text-align-left\" data-align=\"left\">Blackout Window<\/th><th class=\"has-text-align-left\" data-align=\"left\">Use Case<\/th><\/tr><tr><td>\ud83d\udcde Evening billing run<\/td><td>18,19,20,21,22,23<\/td><td>6 PM \u2013 Midnight<\/td><td>\ud83d\udd12 Monthly reconciliation during off-peak evening hours<\/td><\/tr><tr><td>\ud83d\udcca Overnight processing<\/td><td>0,1,2,3,4,5<\/td><td>Midnight \u2013 6 AM<\/td><td>\ud83d\udd27 Database maintenance and report generation<\/td><\/tr><tr><td>\ud83d\udcb0 End-of-day billing<\/td><td>22,23,0,1<\/td><td>10 PM \u2013 2 AM<\/td><td>\ud83d\udccb Daily settlement across midnight boundary<\/td><\/tr><tr><td>\ud83d\udee1\ufe0f All-day restriction<\/td><td>0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23<\/td><td>24 hours<\/td><td>\ud83d\udea8 Complete CDR access lockdown during audits<\/td><\/tr><tr><td>\u2705 No restriction<\/td><td>(leave empty)<\/td><td>None<\/td><td>\ud83d\udcca Default \u2014 CDR queries available 24\/7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u26a0\ufe0f <strong>Important note:<\/strong> The blackout hours are specified in the <strong>server&#8217;s local timezone<\/strong>. If your VOS3000 server is configured in UTC and your billing team works in a different timezone, you must convert the desired blackout window to match the server timezone. For example, if your billing team in Dhaka (UTC+6) wants to block queries from 6 PM to 10 PM local time, and the server is in UTC, the parameter should be set to <code>12,13,14,15,16<\/code> (6 PM UTC+6 = 12 UTC, 10 PM UTC+6 = 16 UTC). \ud83c\udf10<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-step-by-step-vos-3000-cdr-query-blackout-configuration\">\ud83d\udccb Step-by-Step VOS3000 CDR Query Blackout Configuration<\/h2>\n\n\n\n<p>\ud83d\udda5\ufe0f Follow these steps to configure the CDR query blackout on your VOS3000 system: \ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-determine-blackout-window-\u23f1\ufe0f\">Step 1: Determine Blackout Window \u23f1\ufe0f<\/h3>\n\n\n\n<p>\ud83d\udcca Identify the hours when CDR queries should be blocked based on your operational needs:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcc5 <strong>Billing run schedule:<\/strong> When does your monthly\/daily reconciliation run?<\/li>\n\n\n\n<li>\ud83d\udd27 <strong>Maintenance windows:<\/strong> When are database optimizations scheduled?<\/li>\n\n\n\n<li>\ud83d\udcca <strong>Report generation:<\/strong> When do automated reports run?<\/li>\n\n\n\n<li>\ud83c\udf0d <strong>Timezone alignment:<\/strong> Convert desired blackout hours to server timezone if different<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-configure-the-parameter-\ud83d\udccc\">Step 2: Configure the Parameter \ud83d\udccc<\/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 Server parameter<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Locate <strong>SERVER_QUERY_CDR_DENY_TIME<\/strong><\/li>\n\n\n\n<li>\u270f\ufe0f Enter the comma-separated hour values (e.g., <code>18,19,20,21,22,23<\/code>)<\/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-3-verify-blackout-enforcement-\u2705\">Step 3: Verify Blackout Enforcement \u2705<\/h3>\n\n\n\n<p>\ud83d\udd0d After configuration, verify that the blackout is working correctly:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udd50 Wait until a configured blackout hour<\/li>\n\n\n\n<li>\ud83d\udcca Attempt to query CDR records through the VOS3000 Client<\/li>\n\n\n\n<li>\u2705 Confirm that the query is denied with a restriction message<\/li>\n\n\n\n<li>\ud83d\udd50 After the blackout window ends, verify that CDR queries are restored<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd04-vos-3000-cdr-query-blackout-and-related-parameters\">\ud83d\udd04 VOS3000 CDR Query Blackout and Related Parameters<\/h2>\n\n\n\n<p>\ud83d\udd17 The CDR query blackout works alongside several other CDR access control parameters that together form a comprehensive data protection strategy: \ud83d\udccb<\/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\">Purpose<\/th><th class=\"has-text-align-left\" data-align=\"left\">Complements Blackout?<\/th><\/tr><tr><td>SERVER_QUERY_CDR_DENY_TIME<\/td><td>None<\/td><td>Blocks CDR queries during specified hours<\/td><td>\ud83d\udd11 Core parameter<\/td><\/tr><tr><td>SERVER_QUERY_CDR_MAX_DAY_INTERVAL<\/td><td>31<\/td><td>Limits CDR query date range to 31 days max<\/td><td>\u2705 Prevents heavy queries outside blackout<\/td><\/tr><tr><td>SERVER_QUERY_MAX_ONE_PAGE_SIZE<\/td><td>200000<\/td><td>Maximum records per page in query results<\/td><td>\u2705 Limits query result size<\/td><\/tr><tr><td>SERVER_QUERY_MAX_SIZE<\/td><td>30000000<\/td><td>Total data query limit (items)<\/td><td>\u2705 Prevents runaway queries<\/td><\/tr><tr><td>SERVER_QUERY_ONE_PAGE_SIZE<\/td><td>10000<\/td><td>Default records per page<\/td><td>\u2705 Standard pagination control<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>Layered protection strategy:<\/strong> For maximum database protection, combine the VOS3000 CDR query blackout with the date range limit (SERVER_QUERY_CDR_MAX_DAY_INTERVAL) and query size limits. The blackout prevents access during critical processing hours, while the date range and size limits prevent excessively heavy queries at any time. This layered approach ensures that even when queries are permitted, they cannot consume excessive resources. For the date range limit configuration, see our CDR query date range guide. \ud83d\udd17<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-vos-3000-cdr-query-blackout-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 CDR Query Blackout Problems and Solutions<\/h2>\n\n\n\n<p>\u274c Misconfigured blackout settings can cause either insufficient protection or unexpected access denial. Here are the most common issues: \ud83d\udd0d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-cdr-queries-still-allowed-during-blackout-hours\">\u274c Problem 1: CDR Queries Still Allowed During Blackout Hours<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> Users can still query CDR records during the configured blackout hours.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The parameter value may contain formatting errors, or the configuration may not have been properly applied after saving.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Verify the parameter value uses correct comma-separated format (e.g., <code>18,19,20<\/code> \u2014 not <code>18-20<\/code> or <code>6pm-8pm<\/code>)<\/li>\n\n\n\n<li>\ud83d\udcca Ensure there are no spaces in the parameter value<\/li>\n\n\n\n<li>\ud83d\udd04 Re-apply the configuration and restart the softswitch service if necessary<\/li>\n\n\n\n<li>\ud83d\udd50 Confirm you are testing during the correct hours based on the <strong>server timezone<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-blackout-applied-in-wrong-timezone\">\u274c Problem 2: Blackout Applied in Wrong Timezone<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> CDR queries are blocked at unexpected times \u2014 not during your intended window.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The SERVER_QUERY_CDR_DENY_TIME operates on the server&#8217;s system clock timezone, which may differ from your local timezone. If the server is configured in UTC and you specified hours in your local timezone, the blackout window will be offset.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83c\udf10 Check the server timezone: <code>date<\/code> or <code>timedatectl<\/code> on the VOS3000 Linux server<\/li>\n\n\n\n<li>\ud83d\udd04 Convert your desired blackout hours to the server&#8217;s timezone<\/li>\n\n\n\n<li>\ud83d\udccb Update the parameter with the corrected hour values<\/li>\n\n\n\n<li>\ud83d\udd50 Verify by testing a query during the intended blackout window<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-resellers-unable-to-access-cd-rs-during-business-hours\">\u274c Problem 3: Resellers Unable to Access CDRs During Business Hours<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> Resellers complain they cannot check their CDRs during normal working hours.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The blackout window is set too broadly, covering business hours in addition to billing run periods. This is common when operators set the blackout for the entire evening without narrowing it to the actual billing processing window.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u23f1\ufe0f Narrow the blackout window to only the hours when billing runs actually occur<\/li>\n\n\n\n<li>\ud83d\udcca Schedule billing runs during the lowest-traffic period (typically late night or early morning)<\/li>\n\n\n\n<li>\ud83d\udccb Communicate the blackout schedule to all resellers in advance<\/li>\n\n\n\n<li>\ud83d\udd04 If resellers need CDR access, provide them with the CDR text file backup or real-time forwarding as an alternative<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-4-blackout-not-preventing-heavy-queries-outside-blackout-hours\">\u274c Problem 4: Blackout Not Preventing Heavy Queries Outside Blackout Hours<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> Database performance degrades from heavy CDR queries that run outside the blackout window.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The VOS3000 CDR query blackout only restricts access during specified hours. Outside those hours, users can still run very large queries that impact performance.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcc5 Set <strong>SERVER_QUERY_CDR_MAX_DAY_INTERVAL<\/strong> to limit query date ranges (default: 31 days)<\/li>\n\n\n\n<li>\ud83d\udce6 Reduce <strong>SERVER_QUERY_MAX_ONE_PAGE_SIZE<\/strong> to limit result set sizes<\/li>\n\n\n\n<li>\ud83d\udcca Monitor slow queries in the database and identify the heaviest users<\/li>\n\n\n\n<li>\ud83d\udccb For more on managing query performance, see our CDR analysis guide<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udca1-vos-3000-cdr-query-blackout-best-practices\">\ud83d\udca1 VOS3000 CDR Query Blackout Best Practices<\/h2>\n\n\n\n<p>\ud83c\udfaf Follow these best practices to balance database protection with user access needs: \ud83d\udccb<\/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\">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 Minimize blackout window<\/td><td>Cover only actual billing run hours<\/td><td>\u2705 Reduces impact on reseller operations<\/td><\/tr><tr><td>\ud83c\udf10 Verify server timezone<\/td><td>Convert blackout hours to server local time<\/td><td>\ud83d\udd27 Prevents misaligned blackout windows<\/td><\/tr><tr><td>\ud83d\udccb Communicate schedule<\/td><td>Notify all users of blackout periods<\/td><td>\ud83d\udcde Manages expectations and reduces support tickets<\/td><\/tr><tr><td>\ud83d\udee1\ufe0f Layer query controls<\/td><td>Combine blackout + date range + size limits<\/td><td>\ud83d\udd12 Comprehensive database protection at all times<\/td><\/tr><tr><td>\ud83d\udd04 Test after changes<\/td><td>Verify both denied and allowed periods<\/td><td>\u2705 Confirms correct configuration<\/td><\/tr><tr><td>\ud83d\udcca Schedule during low traffic<\/td><td>Align billing runs with off-peak hours<\/td><td>\ud83d\udcde Minimizes impact on active users<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udcac Questions about configuring VOS3000 CDR access policies? Reach out at <strong>WhatsApp: +8801911119966<\/strong> \u2014 our VOS3000 specialists can help you design a comprehensive data protection strategy. \ud83d\udcde<\/p>\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-default-value-for-server-query-cdr-deny-time\">\u2753 What is the default value for SERVER_QUERY_CDR_DENY_TIME?<\/h3>\n\n\n\n<p>\ud83d\udccb The default value is <strong>None<\/strong> (not configured), which means there is no CDR query blackout \u2014 all users can query CDR records at any time. To enable the VOS3000 CDR query blackout, set the parameter to a comma-separated list of hours (0\u201323) when queries should be blocked. For example, <code>18,19,20,21,22,23<\/code> blocks CDR queries from 6 PM to midnight each day. \ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-does-the-vos-3000-cdr-query-blackout-apply-to-all-users\">\u2753 Does the VOS3000 CDR query blackout apply to all users?<\/h3>\n\n\n\n<p>\ud83d\udd12 Yes. The SERVER_QUERY_CDR_DENY_TIME parameter applies at the server level, which means it blocks CDR queries for all users \u2014 including administrators, agents, and resellers. There is no per-user or per-role exemption. During the blackout hours, no one can query CDR records through the VOS3000 Client or web interface. If you need differentiated access control, consider using the VOS3000 Web API with custom application-level access controls. For Web API details, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-web-api-account-management\/\">VOS3000 Web API account management guide<\/a>. \ud83d\udd17<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-configure-different-blackout-windows-for-different-days-of-the-week\">\u2753 Can I configure different blackout windows for different days of the week?<\/h3>\n\n\n\n<p>\ud83d\udcc5 No. The VOS3000 CDR query blackout applies the same hours every day. The SERVER_QUERY_CDR_DENY_TIME parameter does not support day-of-week differentiation \u2014 if you set <code>18,19,20<\/code>, CDR queries are blocked from 6 PM to 9 PM on Monday through Sunday. If you need different schedules for weekdays vs weekends, you would need to manually change the parameter value, or implement a custom automation script that updates the parameter on a schedule. \ud83d\udd04<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-does-the-vos-3000-cdr-query-blackout-interact-with-automated-reports\">\u2753 How does the VOS3000 CDR query blackout interact with automated reports?<\/h3>\n\n\n\n<p>\ud83d\udcca The VOS3000 CDR query blackout restricts <em>manual<\/em> CDR queries through the client and web interfaces. Automated report generation (configured under Navigation \u2192 Report management) may operate independently of the blackout restriction since reports are generated by the system internally rather than through the query interface. However, if automated reports rely on the same query mechanism, they may also be affected. Always test your report generation schedule against the blackout window to ensure reports can complete successfully. For report configuration, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">billing system overview<\/a>. \ud83d\udccb<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-happens-when-a-user-tries-to-query-cd-rs-during-the-blackout\">\u2753 What happens when a user tries to query CDRs during the blackout?<\/h3>\n\n\n\n<p>\ud83d\udeab When a user attempts to search or view CDR records during the configured blackout hours, the VOS3000 system denies the query and displays a restriction notice. The user is informed that CDR queries are not available during this time period. No partial results are returned. The query does not execute at all \u2014 it is blocked before reaching the database, ensuring zero impact on database performance during the blackout window. \ud83d\udd12<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-temporarily-disable-the-blackout-for-emergency-cdr-access\">\u2753 Can I temporarily disable the blackout for emergency CDR access?<\/h3>\n\n\n\n<p>\ud83d\udd27 Yes. To temporarily disable the VOS3000 CDR query blackout, set the SERVER_QUERY_CDR_DENY_TIME parameter to empty (None) and save the configuration. This immediately restores CDR query access for all users. After the emergency access is no longer needed, re-enter the blackout hours and save again. Remember to re-enable the blackout promptly to maintain database protection during billing runs. For help managing VOS3000 parameters, contact our team at <strong>WhatsApp: +8801911119966<\/strong>. \ud83d\udcac<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-expert-help-with-vos-3000-cdr-query-blackout\">\ud83d\udcde Need Expert Help with VOS3000 CDR Query Blackout?<\/h2>\n\n\n\n<p>\ud83d\udd27 Proper VOS3000 CDR query blackout configuration protects your billing operations from performance disruptions while maintaining appropriate access for your resellers and support team. Whether you need to set up your first blackout window, troubleshoot timezone issues, or design a comprehensive CDR access control strategy, our VOS3000 experts are ready to assist. \ud83d\udee1\ufe0f<\/p>\n\n\n\n<p>\ud83d\udcac Contact us at <strong>WhatsApp: +8801911119966<\/strong> for professional VOS3000 deployment and configuration support. We help VoIP operators worldwide optimize billing security, database performance, and operational efficiency. \ud83c\udf10<\/p>\n\n\n\n<p>\ud83d\udcd6 Explore related guides: <a href=\"https:\/\/multahost.com\/blog\/vos3000-cdr-query\">CDR query date range limit<\/a>, <a href=\"https:\/\/multahost.com\/blog\/vos3000-cdr-analysis-billing\/\">CDR analysis and billing<\/a>, and <a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\">parameter description reference<\/a>. \ud83d\udd17<\/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\" target=\"_blank\" rel=\"noopener\">www.vos3000.com<\/a><br>\ud83c\udf10 <strong>Blog:<\/strong> <a href=\"https:\/\/multahost.com\/blog\">multahost.com\/blog<\/a><br>\ud83d\udce5 <strong>Downloads:<\/strong> <a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noopener\">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 data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 CDR File Rotation, VOS3000 Real-Time CDR Forwarding, VOS3000 CDR Query Blackout, VOS3000 CDR Query Date Range, VOS3000 CDR Text File Export, VOS3000 CDR Pipe Format, VOS3000 CDR Billing Mode Codes, VOS3000 CDR End Direction Critical\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Real-Time-CDR-Forwarding-VOS3000-CDR-Query-Blackout-VOS3000-CDR-Query-Date-Range-VOS3000-CDR-Text-File-Export-VOS3000-CDR-Pipe-Format-VOS3000-CDR-Billing-Mode-Codes.png?resize=809%2C540\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 CDR File Rotation, VOS3000 Real-Time CDR Forwarding, VOS3000 CDR Query Blackout, VOS3000 CDR Query Date Range, VOS3000 CDR Text File Export, VOS3000 CDR Pipe Format, VOS3000 CDR Billing Mode Codes, VOS3000 CDR End Direction Critical\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Real-Time-CDR-Forwarding-VOS3000-CDR-Query-Blackout-VOS3000-CDR-Query-Date-Range-VOS3000-CDR-Text-File-Export-VOS3000-CDR-Pipe-Format-VOS3000-CDR-Billing-Mode-Codes.png?resize=809%2C540\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 CDR File Rotation, VOS3000 Real-Time CDR Forwarding, VOS3000 CDR Query Blackout, VOS3000 CDR Query Date Range, VOS3000 CDR Text File Export, VOS3000 CDR Pipe Format, VOS3000 CDR Billing Mode Codes, VOS3000 CDR End Direction Critical\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Real-Time-CDR-Forwarding-VOS3000-CDR-Query-Blackout-VOS3000-CDR-Query-Date-Range-VOS3000-CDR-Text-File-Export-VOS3000-CDR-Pipe-Format-VOS3000-CDR-Billing-Mode-Codes.png?resize=809%2C540\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Configure VOS3000 CDR query blackout with SERVER_QUERY_CDR_DENY_TIME. Restrict CDR access during billing runs, protect database performance, and schedule deny windows using 24-hour format.<\/p>\n","protected":false},"author":1,"featured_media":3261,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[2],"tags":[9335,9340,9353,9343,9365,9339,9357,9370,9374,9355,9342,9347,9338,9366,9376,9345,9371,9336,9359,9377,9349,9372,9373,9367,5899,9362,9334,9364,9341,9346,9379,9368,9354,9337,9358,9378,9375,9363,9352,9360,9350,9369,9380,9356,9348,9344,5655,9351,9361],"class_list":["post-3268","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000","tag-server_query_cdr_deny_time","tag-vos3000-block-cdr-query","tag-vos3000-cdr-24-hour-format","tag-vos3000-cdr-access-control","tag-vos3000-cdr-access-hours","tag-vos3000-cdr-access-restriction","tag-vos3000-cdr-access-schedule","tag-vos3000-cdr-admin-settings","tag-vos3000-cdr-billing-cycle","tag-vos3000-cdr-billing-run","tag-vos3000-cdr-billing-window","tag-vos3000-cdr-blackout-configuration","tag-vos3000-cdr-blackout-hours","tag-vos3000-cdr-data-protection","tag-vos3000-cdr-database-load","tag-vos3000-cdr-database-protection","tag-vos3000-cdr-deny-configuration","tag-vos3000-cdr-deny-time","tag-vos3000-cdr-deny-time-configuration","tag-vos3000-cdr-heavy-query","tag-vos3000-cdr-maintenance-window","tag-vos3000-cdr-night-window","tag-vos3000-cdr-off-peak-query","tag-vos3000-cdr-operator-restriction","tag-vos3000-cdr-performance","tag-vos3000-cdr-portal-restriction","tag-vos3000-cdr-query-blackout","tag-vos3000-cdr-query-blocked","tag-vos3000-cdr-query-deny","tag-vos3000-cdr-query-hours","tag-vos3000-cdr-query-limit","tag-vos3000-cdr-query-management","tag-vos3000-cdr-query-protection","tag-vos3000-cdr-query-restriction","tag-vos3000-cdr-query-time-window","tag-vos3000-cdr-rate-table","tag-vos3000-cdr-reconciliation-window","tag-vos3000-cdr-report-generation","tag-vos3000-cdr-reporting-restriction","tag-vos3000-cdr-restriction-hours","tag-vos3000-cdr-scheduled-access","tag-vos3000-cdr-security","tag-vos3000-cdr-time-restriction","tag-vos3000-database-performance-cdr","tag-vos3000-reseller-cdr-restriction","tag-vos3000-server-parameter-cdr-deny","tag-vos3000-server-parameters","tag-vos3000-softswitch-cdr-settings","tag-vos3000-voip-cdr-access"],"acf":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-CDR-Query-Blackout-VOS3000-CDR-Query-Date-Range-VOS3000-CDR-Text-File-Export-VOS3000-CDR-Pipe-Format-VOS3000-CDR-Billing-Mode-Codes-VOS3000-CDR-End-Direction-Critical.png?fit=1536%2C1024&ssl=1?v=1777165522","jetpack-related-posts":[{"id":1809,"url":"https:\/\/multahost.com\/blog\/vos3000-vicidial-auto-dialer\/","url_meta":{"origin":3268,"position":0},"title":"VOS3000 VICIdial Auto Dialer Solution \u2013 Call Center Important Setup Guide","author":"king","date":"March 13, 2026","format":false,"excerpt":"Complete guide to VOS3000 VICIdial auto dialer solution for call centers. Learn how VICIdial connects with VOS3000 for routing and telecom carrier management.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"best voip softswitch, vos3000 routing, vos3000 vicidial auto dialer, vos3000 sip trunk configuration","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":1631,"url":"https:\/\/multahost.com\/blog\/vos3000-data-maintenance\/","url_meta":{"origin":3268,"position":1},"title":"VOS3000 Data Maintenance &amp; Auto\u2011Cleanup: Important Database Management Guide","author":"king","date":"March 8, 2026","format":false,"excerpt":"VOS3000 data maintenance guide: learn how to manage CDR tables, enable auto\u2011cleanup, optimize database performance, and prevent disk space issues with scheduled purging.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/vos3000-banners-post.png?fit=1200%2C402&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":710,"url":"https:\/\/multahost.com\/blog\/why-vos3000-server-getting-restarted-daily-auto\/","url_meta":{"origin":3268,"position":2},"title":"Why VOS3000 Server getting restarted daily auto, Know easy Solution","author":"king","date":"September 29, 2025","format":false,"excerpt":"Why VOS3000 Server getting restarted daily auto? VOS3000 2.1.8.0 or 2.1.8.05 sometime VOS3000 server went down\/restart\/reboot auto daily in a fixed time and VOS3000 server starts but vos3000 softswitch shows offline or softswitch stays offline or red on softswich","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"VOS3000 Server down","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/1759078473-e1759086323296.png?fit=928%2C480&ssl=1%3Fv%3D1768597291&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/1759078473-e1759086323296.png?fit=928%2C480&ssl=1%3Fv%3D1768597291&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/1759078473-e1759086323296.png?fit=928%2C480&ssl=1%3Fv%3D1768597291&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/1759078473-e1759086323296.png?fit=928%2C480&ssl=1%3Fv%3D1768597291&resize=700%2C400 2x"},"classes":[]},{"id":3017,"url":"https:\/\/multahost.com\/blog\/vos3000-g729-negotiation-mode-fix\/","url_meta":{"origin":3268,"position":3},"title":"VOS3000 G729 Negotiation Mode: Reliable Fix for Codec Mismatch","author":"king","date":"April 18, 2026","format":false,"excerpt":"VOS3000 G729 negotiation mode fixes codec mismatch between G729 and G729a. 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