{"id":3383,"date":"2026-04-28T13:43:07","date_gmt":"2026-04-28T13:43:07","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3383"},"modified":"2026-04-28T14:00:25","modified_gmt":"2026-04-28T14:00:25","slug":"vos3000-system-white-list-configuration","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-system-white-list-configuration\/","title":{"rendered":"VOS3000 System White List: Best Advanced Global Allow-List Configuration"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-system-white-list-advanced-global-allow-list-configuration\">VOS3000 System White List: Advanced Global Allow-List Configuration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde In VOS3000, blocking rules exist at multiple levels \u2014 black list groups on gateways, dynamic blacklists, and prefix-based filtering. But what happens when you need to guarantee that certain numbers can never be blocked, regardless of any other filtering rule in the system? The <strong>VOS3000 system white list<\/strong> provides exactly this capability: a global allow-list that overrides all other blocking rules, ensuring that critical numbers like emergency services, trusted partners, and regulatory-required numbers always get through. \ud83d\udd27<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2699\ufe0f The VOS3000 2.1.9.07 manual \u00a72.13.5 defines the System White List as &#8220;this function is used to manage system white list.&#8221; While the description is concise, the security implications are profound. Numbers entered in the <strong>VOS3000 system white list<\/strong> are treated as globally trusted \u2014 they bypass black list group checks, dynamic blacklist blocks, and other filtering mechanisms that would otherwise reject the call. This makes the system white list the highest-priority allow mechanism in the entire VOS3000 access control hierarchy. \ud83d\udcca<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf This guide covers every aspect of the <strong>VOS3000 system white list<\/strong>: how it differs from account-level white lists, the security implications of global override authority, when and how to add numbers to the system white list, and best practices for managing this powerful feature responsibly. Need expert help? WhatsApp us at <strong>+8801911119966<\/strong> for professional VOS3000 configuration support. \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-system-white-list-advanced-global-allow-list-configuration\">VOS3000 System White List: Advanced Global Allow-List Configuration<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-the-vos-3000-system-white-list\">\ud83d\udd10 What Is the VOS3000 System White List?<\/a><ul><li><a href=\"#\ud83d\udccb-system-white-list-configuration-fields\">\ud83d\udccb System White List Configuration Fields<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-system-white-list-vs-account-level-white-lists\">\u2699\ufe0f System White List vs Account-Level White Lists<\/a><\/li><li><a href=\"#\ud83d\udcca-access-control-priority-hierarchy\">\ud83d\udcca Access Control Priority Hierarchy<\/a><\/li><li><a href=\"#\ud83d\udda5\ufe0f-step-by-step-vos-3000-system-white-list-configuration\">\ud83d\udda5\ufe0f Step-by-Step VOS3000 System White List Configuration<\/a><ul><li><a href=\"#step-1-access-the-system-white-list-\ud83c\udf10\">Step 1: Access the System White List \ud83c\udf10<\/a><\/li><li><a href=\"#step-2-add-numbers-to-the-system-white-list-\u23f0\">Step 2: Add Numbers to the System White List \u23f0<\/a><\/li><li><a href=\"#step-3-verify-system-white-list-operation-\ud83d\udd0d\">Step 3: Verify System White List Operation \ud83d\udd0d<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd04-when-to-use-the-vos-3000-system-white-list\">\ud83d\udd04 When to Use the VOS3000 System White List<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-security-implications-of-the-system-white-list\">\ud83d\udee1\ufe0f Security Implications of the System White List<\/a><\/li><li><a href=\"#\ud83d\udca1-vos-3000-system-white-list-best-practices\">\ud83d\udca1 VOS3000 System White List Best Practices<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-the-vos-3000-system-white-list\">\u2753 What is the VOS3000 system white list?<\/a><\/li><li><a href=\"#\u2753-how-does-the-system-white-list-differ-from-account-level-white-lists\">\u2753 How does the system white list differ from account-level white lists?<\/a><\/li><li><a href=\"#\u2753-can-a-system-white-list-number-ever-be-blocked\">\u2753 Can a system white list number ever be blocked?<\/a><\/li><li><a href=\"#\u2753-what-numbers-should-i-add-to-the-vos-3000-system-white-list\">\u2753 What numbers should I add to the VOS3000 system white list?<\/a><\/li><li><a href=\"#\u2753-how-do-i-add-a-number-to-the-vos-3000-system-white-list\">\u2753 How do I add a number to the VOS3000 system white list?<\/a><\/li><li><a href=\"#\u2753-what-are-the-security-risks-of-the-vos-3000-system-white-list\">\u2753 What are the security risks of the VOS3000 system white list?<\/a><\/li><\/ul><\/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-system-white-list\">\ud83d\udd10 What Is the VOS3000 System White List?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f The <strong>VOS3000 system white list<\/strong> is a global list of trusted phone numbers that are always allowed through the softswitch, overriding any black list or blocking rule that would otherwise reject the call. It is managed at the system level (not per-gateway or per-account) and applies to all call processing across the entire VOS3000 deployment. \ud83d\udcde<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Why a system-level white list is necessary:<\/strong> In a production VoIP environment, multiple blocking mechanisms operate simultaneously \u2014 caller black list groups on gateways, callee black list groups, dynamic blacklists that auto-block suspicious numbers, and prefix-based filters. While these mechanisms protect against fraud and unwanted traffic, they can also accidentally block legitimate numbers. Emergency service numbers (911, 112, 999) must never be blocked under any circumstances. Regulatory requirements in many jurisdictions mandate that certain numbers always be reachable. The <strong>VOS3000 system white list<\/strong> provides this guarantee at the highest level of the access control hierarchy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccd <strong>Location in VOS3000 Client:<\/strong> Navigation \u2192 Number management \u2192 System white list<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-system-white-list-configuration-fields\">\ud83d\udccb System White List Configuration Fields<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udf10 According to the VOS3000 2.1.9.07 manual \u00a72.13.5, the System White List table contains the following fields:<\/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\">Field<\/th><th class=\"has-text-align-left\" data-align=\"left\">Description<\/th><th class=\"has-text-align-left\" data-align=\"left\">Example<\/th><\/tr><tr><td>Phone number<\/td><td>The trusted phone number that is globally allowed<\/td><td>911, 112, 18001234567<\/td><\/tr><tr><td>Memo<\/td><td>Comments describing why this number is in the system white list<\/td><td>&#8220;Emergency police number \u2014 regulatory requirement&#8221;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd11 <strong>Key insight:<\/strong> The memo field is critically important for the <strong>VOS3000 system white list<\/strong>. Because system white list entries override all blocking rules, every entry should have a clear justification documented in the memo. This creates an audit trail that explains why each number has global override authority, which is essential for security reviews and regulatory compliance audits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-system-white-list-vs-account-level-white-lists\">\u2699\ufe0f System White List vs Account-Level White Lists<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 Understanding the difference between the <strong>VOS3000 system white list<\/strong> and account-level or gateway-level white lists is essential for designing a proper access control architecture:<\/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\">Feature<\/th><th class=\"has-text-align-left\" data-align=\"left\">System White List<\/th><th class=\"has-text-align-left\" data-align=\"left\">Account\/Gateway White List Groups<\/th><\/tr><tr><td>Scope<\/td><td>Global \u2014 applies to all gateways and accounts<\/td><td>Local \u2014 applies only to the specific gateway or account<\/td><\/tr><tr><td>Override authority<\/td><td>Overrides all black list and blocking rules system-wide<\/td><td>Only overrides black lists on the same gateway or account<\/td><\/tr><tr><td>Management location<\/td><td>Number management \u2192 System white list<\/td><td>Number management \u2192 Black\/White List Group<\/td><\/tr><tr><td>Typical use case<\/td><td>Emergency numbers, regulatory-required numbers, interconnect partners<\/td><td>Business-specific allowed caller\/callee lists<\/td><\/tr><tr><td>Risk of misuse<\/td><td>High \u2014 a number here bypasses all security<\/td><td>Lower \u2014 only affects the assigned entity<\/td><\/tr><tr><td>Recommended count<\/td><td>Minimal \u2014 only truly critical numbers<\/td><td>As many as needed for business operations<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd11 <strong>Key distinction:<\/strong> The <strong>VOS3000 system white list<\/strong> is the nuclear option \u2014 it guarantees access regardless of any other rule. Account-level white list groups are the surgical option \u2014 they provide allow-listing only where specifically assigned. The system white list should be reserved for numbers that must never be blocked under any circumstances, while account-level groups handle routine business filtering needs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-access-control-priority-hierarchy\">\ud83d\udcca Access Control Priority Hierarchy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf The VOS3000 access control system operates in a priority hierarchy. Understanding this hierarchy is essential for predicting how different rules interact:<\/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\">Priority<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rule Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Effect<\/th><\/tr><tr><td>1 (Highest)<\/td><td>System White List<\/td><td>Always allow \u2014 overrides all blocking rules below<\/td><\/tr><tr><td>2<\/td><td>Dynamic Black List<\/td><td>Auto-block numbers exhibiting suspicious behavior<\/td><\/tr><tr><td>3<\/td><td>Gateway\/Account Black List Groups<\/td><td>Block specific numbers on assigned gateways\/accounts<\/td><\/tr><tr><td>4<\/td><td>Gateway\/Account White List Groups<\/td><td>Allow specific numbers on assigned gateways\/accounts<\/td><\/tr><tr><td>5 (Lowest)<\/td><td>Default routing rules<\/td><td>Standard call processing when no filter rules match<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Practical implication:<\/strong> If a number appears in both the system white list and a dynamic black list, the system white list wins \u2014 the call is allowed. This is by design, because the <strong>VOS3000 system white list<\/strong> represents the operator&#8217;s explicit decision that a particular number must always be reachable. However, this also means you must be extremely careful about what numbers you add to the system white list, as they become immune to all fraud prevention mechanisms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udda5\ufe0f-step-by-step-vos-3000-system-white-list-configuration\">\ud83d\udda5\ufe0f Step-by-Step VOS3000 System White List Configuration<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-access-the-system-white-list-\ud83c\udf10\">Step 1: Access the System White List \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 Double-click <strong>Navigation \u2192 Number management \u2192 System white list<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-add-numbers-to-the-system-white-list-\u23f0\">Step 2: Add Numbers to the System White List \u23f0<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u2795 Click Add to create a new entry<\/li>\n\n\n\n<li>\ud83d\udcdd Enter the <strong>Phone number<\/strong> that must always be allowed<\/li>\n\n\n\n<li>\ud83d\udcdd Enter a <strong>Memo<\/strong> explaining why this number requires global override authority<\/li>\n\n\n\n<li>\ud83d\udcbe Save the entry<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-3-verify-system-white-list-operation-\ud83d\udd0d\">Step 3: Verify System White List Operation \ud83d\udd0d<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcde Test that the system white list number can be reached even when it appears in a black list group<\/li>\n\n\n\n<li>\ud83d\udcca Verify that removing the number from the system white list restores normal blocking behavior<\/li>\n\n\n\n<li>\ud83d\udd27 Confirm that the memo field accurately documents each entry&#8217;s justification<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd04-when-to-use-the-vos-3000-system-white-list\">\ud83d\udd04 When to Use the VOS3000 System White List<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udee1\ufe0f The <strong>VOS3000 system white list<\/strong> should be used sparingly and only for numbers that meet strict criteria. Here are the legitimate use cases:<\/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\">Use Case<\/th><th class=\"has-text-align-left\" data-align=\"left\">Example Numbers<\/th><th class=\"has-text-align-left\" data-align=\"left\">Justification<\/th><\/tr><tr><td>Emergency services<\/td><td>911, 112, 999, 110, 119<\/td><td>Regulatory requirement \u2014 emergency numbers must never be blocked<\/td><\/tr><tr><td>Regulatory-mandated numbers<\/td><td>Number portability inquiry, disability access<\/td><td>Government regulations require these numbers to always be reachable<\/td><\/tr><tr><td>Critical interconnect partners<\/td><td>Tier-1 carrier test numbers<\/td><td>Blocking these numbers would disrupt interconnect testing and monitoring<\/td><\/tr><tr><td>Internal operations numbers<\/td><td>NOC hotline, monitoring probe numbers<\/td><td>Network operations center must always be reachable, even during attack<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd11 <strong>What NOT to add:<\/strong> Never add customer phone numbers, vendor gateway numbers, or general business numbers to the system white list. These numbers should be managed at the account or gateway level using <a href=\"https:\/\/multahost.com\/blog\/vos3000-black-white-list-groups\/\">black\/white list groups<\/a>. The system white list should only contain numbers that have a regulatory, safety, or operational necessity to bypass all security filtering.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-security-implications-of-the-system-white-list\">\ud83d\udee1\ufe0f Security Implications of the System White List<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f The <strong>VOS3000 system white list<\/strong> is the most powerful allow mechanism in the access control hierarchy, and with that power comes significant security responsibility. Understanding the implications is essential:<\/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\">Implication<\/th><th class=\"has-text-align-left\" data-align=\"left\">Description<\/th><th class=\"has-text-align-left\" data-align=\"left\">Mitigation<\/th><\/tr><tr><td>Bypasses fraud detection<\/td><td>System white list numbers bypass dynamic blacklist and fraud detection<\/td><td>Only add numbers that are verified legitimate beyond any doubt<\/td><\/tr><tr><td>Cannot be overridden<\/td><td>No other rule can block a system white list number<\/td><td>Implement change control process for additions<\/td><\/tr><tr><td>Potential for abuse<\/td><td>If an attacker gains access, they could whitelist their own numbers<\/td><td>Restrict system white list access to senior administrators only<\/td><\/tr><tr><td>No per-gateway control<\/td><td>System white list applies globally to all gateways<\/td><td>Use account-level lists for gateway-specific filtering<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Security best practice:<\/strong> Treat the <strong>VOS3000 system white list<\/strong> like root access on a Linux server \u2014 grant it sparingly, audit it regularly, and document every entry with a clear business justification. Conduct quarterly reviews of all system white list entries to ensure each one is still necessary. Remove entries that no longer meet the strict criteria for global override authority.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udca1-vos-3000-system-white-list-best-practices\">\ud83d\udca1 VOS3000 System White List 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 Minimize entries<\/td><td>Only add numbers that must never be blocked<\/td><td>\u2705 Reduces attack surface and override scope<\/td><\/tr><tr><td>\ud83d\udd27 Always add memo<\/td><td>Document the justification for every entry<\/td><td>\ud83c\udfaf Creates audit trail for security reviews<\/td><\/tr><tr><td>\ud83d\udd04 Quarterly review<\/td><td>Review and validate all entries every 3 months<\/td><td>\ud83d\udee1\ufe0f Removes entries that are no longer necessary<\/td><\/tr><tr><td>\ud83d\udccb Change control<\/td><td>Require approval before adding\/removing entries<\/td><td>\ud83d\udcde Prevents unauthorized additions<\/td><\/tr><tr><td>\ud83d\udcc8 Use account-level for business rules<\/td><td>Route business allow lists through list groups, not system white list<\/td><td>\ud83d\udd27 System white list reserved for critical\/regulated numbers only<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Pro tip:<\/strong> The <strong>VOS3000 system white list<\/strong> should contain your absolute minimum set of never-block numbers. For everything else, use <a href=\"https:\/\/multahost.com\/blog\/vos3000-black-white-list-groups\/\">black\/white list groups<\/a> at the gateway and account level, combined with the <a href=\"https:\/\/multahost.com\/blog\/vos3000-dynamic-blacklist-anti-fraud\/\">dynamic blacklist<\/a> for automatic fraud prevention. For VoIP security best practices, see <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc3261\" target=\"_blank\" rel=\"noopener\">RFC 3261<\/a>. This layered approach provides maximum security with minimal override risk. For VoIP security frameworks, see <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc3261\" target=\"_blank\" rel=\"noopener\">RFC 3261<\/a>. For expert access control architecture, reach us at <strong>+8801911119966<\/strong>. \ud83d\udd27<\/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-vos-3000-system-white-list\">\u2753 What is the VOS3000 system white list?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f The <strong>VOS3000 system white list<\/strong> is a global allow-list of phone numbers that override all other blocking rules in the system. When a phone number is entered in the system white list, it is guaranteed to be reachable regardless of any black list groups, dynamic blacklists, or other filtering mechanisms that would normally block it. The VOS3000 manual \u00a72.13.5 defines it as a function used to manage the system white list, and it is configured under Navigation \u2192 Number management \u2192 System white list. It should be reserved for emergency numbers, regulatory-required numbers, and critical operations numbers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-does-the-system-white-list-differ-from-account-level-white-lists\">\u2753 How does the system white list differ from account-level white lists?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 The system white list is global \u2014 it applies to all gateways and accounts across the entire VOS3000 deployment and overrides all blocking rules everywhere. Account-level white lists (configured through <a href=\"https:\/\/multahost.com\/blog\/vos3000-black-white-list-groups\/\">black\/white list groups<\/a>) are local \u2014 they only apply to the specific gateway or account where they are assigned, and they only override black lists on that same entity. The system white list is the highest-priority allow rule in VOS3000, while account-level white lists operate at a lower priority within their assigned scope.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-a-system-white-list-number-ever-be-blocked\">\u2753 Can a system white list number ever be blocked?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf No, by design, a number in the <strong>VOS3000 system white list<\/strong> cannot be blocked by any other filtering mechanism in the system. This includes black list groups on gateways, the dynamic blacklist, and prefix-based filters. The system white list has the highest priority in the access control hierarchy, ensuring that critical numbers like emergency services are always reachable. This is why you must be extremely selective about what numbers you add \u2014 there is no way to override the system white list from any other filtering rule.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-numbers-should-i-add-to-the-vos-3000-system-white-list\">\u2753 What numbers should I add to the VOS3000 system white list?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb Only add numbers that meet strict criteria: emergency service numbers (911, 112, 999) that must never be blocked for safety reasons; regulatory-mandated numbers that your jurisdiction requires to always be reachable; critical interconnect partner numbers whose blocking would disrupt essential carrier services; and internal operations numbers like NOC hotlines that must remain accessible during security incidents. Never add customer numbers, vendor gateway numbers, or general business numbers \u2014 these should be managed through account-level black\/white list groups instead.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-do-i-add-a-number-to-the-vos-3000-system-white-list\">\u2753 How do I add a number to the VOS3000 system white list?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcca In the VOS3000 Client, navigate to <strong>Navigation \u2192 Number management \u2192 System white list<\/strong>. Click Add to create a new entry. Enter the phone number in the &#8220;Phone number&#8221; field and add a descriptive memo explaining why this number requires global override authority. Save the entry. The number will immediately be protected from all blocking rules across the system. Always document the justification in the memo field for audit and security review purposes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-are-the-security-risks-of-the-vos-3000-system-white-list\">\u2753 What are the security risks of the VOS3000 system white list?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd04 The primary security risk is that system white list numbers bypass all fraud detection and blocking mechanisms. If a malicious or compromised number is accidentally added to the system white list, it would be immune to the <a href=\"https:\/\/multahost.com\/blog\/vos3000-dynamic-blacklist-anti-fraud\/\">dynamic blacklist<\/a> and all other fraud prevention measures. Additionally, if an attacker gains administrative access to VOS3000, they could add their own numbers to the system white list to create a permanent bypass. Mitigate these risks by restricting system white list management to senior administrators, requiring change control approval for additions, conducting quarterly reviews of all entries, and keeping the list as small as possible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde Still have questions? WhatsApp us at <strong>+8801911119966<\/strong> for quick answers. \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 class=\"wp-block-paragraph\">For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\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=\"1024\" width=\"768\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-1.png?resize=768%2C1024\" 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 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\" title=\"\"><\/td><td><img data-recalc-dims=\"1\" height=\"1024\" width=\"768\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-1.png?resize=768%2C1024\" 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 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\" title=\"\"><\/td><td><img data-recalc-dims=\"1\" height=\"1024\" width=\"768\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-1.png?resize=768%2C1024\" 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 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\" title=\"\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 system white list for global allow-list configuration. Learn how system-level trusted numbers override all blocking rules and differ from account-level lists.<\/p>\n","protected":false},"author":1,"featured_media":3374,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":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},"jetpack_post_was_ever_published":false},"categories":[2],"tags":[10849,10843,10848,10828,10833,10853,10822,10835,10844,10850,10812,10856,10830,10819,10827,10847,10834,10810,10852,10814,10825,10817,10818,10836,10838,10826,10842,10854,10840,10832,10816,10841,1266,10813,10846,10824,10820,10837,10823,10815,10839,10845,10851,10831,10855,10821,10829],"class_list":["post-3383","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000","tag-vos3000-account-level-vs-system-level","tag-vos3000-anti-fraud-white-list","tag-vos3000-black-list-bypass","tag-vos3000-black-list-override","tag-vos3000-call-filtering-global","tag-vos3000-call-routing-white-list","tag-vos3000-emergency-number-white-list","tag-vos3000-emergency-service-numbers","tag-vos3000-fraud-prevention-allow-list","tag-vos3000-gateway-white-list-vs-system","tag-vos3000-global-allow-list","tag-vos3000-global-number-trust","tag-vos3000-global-trusted-numbers","tag-vos3000-global-white-list","tag-vos3000-mapping-gateway-white-list","tag-vos3000-number-allow-override","tag-vos3000-number-filtering-system-level","tag-vos3000-number-management-configuration","tag-vos3000-number-management-guide","tag-vos3000-number-management-system-white","tag-vos3000-number-management-white-list","tag-vos3000-override-all-blocking-rules","tag-vos3000-phone-number-white-list","tag-vos3000-police-fire-ambulance-white-list","tag-vos3000-regulatory-number-requirements","tag-vos3000-routing-gateway-white-list","tag-vos3000-security-configuration-global","tag-vos3000-security-implications-trusted","tag-vos3000-softswitch-system-list","tag-vos3000-softswitch-white-list","tag-vos3000-system-level-white-list","tag-vos3000-system-parameter-white-list","tag-vos3000-system-white-list","tag-vos3000-system-white-list-configuration","tag-vos3000-system-white-list-examples","tag-vos3000-system-white-list-memo","tag-vos3000-system-white-list-vs-account-white-list","tag-vos3000-toll-free-number-white-list","tag-vos3000-trusted-ip-white-list","tag-vos3000-trusted-numbers-global","tag-vos3000-voip-access-control-global","tag-vos3000-voip-security-best-practices","tag-vos3000-voip-softswitch-configuration","tag-vos3000-voip-white-list","tag-vos3000-white-list-management","tag-vos3000-white-list-priority","tag-vos3000-white-list-security-implications"],"acf":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-System-White-List-VOS3000-Callee-Balance-Verification-VOS3000-Dial-Plan-Wildcards-VOS3000-Number-Length-Matching.png?fit=1536%2C1024&ssl=1?v=1777380496","jetpack-related-posts":[{"id":3212,"url":"https:\/\/multahost.com\/blog\/vos3000-replace-failed-reason-config\/","url_meta":{"origin":3383,"position":0},"title":"VOS3000 Replace Failed Reason Strategic Custom Error Response Configuration","author":"king","date":"April 21, 2026","format":false,"excerpt":"VOS3000 replace failed reason overrides SIP and H.323 error responses with custom codes. Replace 503 with 486 to prevent failover loops and control routing.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"VOS3000 Caller Source Header, VOS3000 Callee Source Header, VOS3000 Remote Ring Back Mode, VOS3000 Call Forward Signal Recognition, VOS3000 Replace Failed Reason","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Caller-Source-Header-VOS3000-Callee-Source-Header-VOS3000-Remote-Ring-Back-Mode-VOS3000-Call-Forward-Signal-Recognition-VOS3000-Replace-Failed-Reason-4.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\/04\/VOS3000-Caller-Source-Header-VOS3000-Callee-Source-Header-VOS3000-Remote-Ring-Back-Mode-VOS3000-Call-Forward-Signal-Recognition-VOS3000-Replace-Failed-Reason-4.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Caller-Source-Header-VOS3000-Callee-Source-Header-VOS3000-Remote-Ring-Back-Mode-VOS3000-Call-Forward-Signal-Recognition-VOS3000-Replace-Failed-Reason-4.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Caller-Source-Header-VOS3000-Callee-Source-Header-VOS3000-Remote-Ring-Back-Mode-VOS3000-Call-Forward-Signal-Recognition-VOS3000-Replace-Failed-Reason-4.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Caller-Source-Header-VOS3000-Callee-Source-Header-VOS3000-Remote-Ring-Back-Mode-VOS3000-Call-Forward-Signal-Recognition-VOS3000-Replace-Failed-Reason-4.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3153,"url":"https:\/\/multahost.com\/blog\/vos3000-sip-privacy-header\/","url_meta":{"origin":3383,"position":1},"title":"VOS3000 SIP Privacy Header: Essential Caller ID Protection Guide","author":"king","date":"April 21, 2026","format":false,"excerpt":"Master VOS3000 SIP privacy header with SS_SIP_USER_AGENT_PRIVACY. Configure Ignore\/Id\/None modes, per-gateway Privacy, P-Asserted-Identity, and caller ID protection.","rel":"","context":"In &quot;VOS3000 SIP&quot;","block_context":{"text":"VOS3000 SIP","link":"https:\/\/multahost.com\/blog\/category\/vos3000-sip\/"},"img":{"alt_text":"VOS3000 SIP Authentication Retry, VOS3000 SIP Early Hangup, VOS3000 SIP Session Timer Refresh, VOS3000 Non-Timer Endpoint Safety, VOS3000 SIP NAT Keepalive, VOS3000 SIP Resend Interval, VOS3000 SIP INVITE Timeout, VOS3000 SIP Call Progress Timeout, VOS3000 SIP Outbound Registration Parameters, VOS3000 SIP Privacy Header, VOS3000 SIP Routing Gateway Contact, VOS3000 SIP Publish Expire, VOS3000 SIP Display From, VOS3000 SIP Send Unregister","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Call-Progress-Timeout-VOS3000-SIP-Outbound-Registration-Parameters-VOS3000-SIP-Privacy-Header-VOS3000-SIP-Routing-Gateway-Contact-VOS3000-SIP-Publish-Expire-VOS3000-SIP-Display-From.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\/04\/VOS3000-SIP-Call-Progress-Timeout-VOS3000-SIP-Outbound-Registration-Parameters-VOS3000-SIP-Privacy-Header-VOS3000-SIP-Routing-Gateway-Contact-VOS3000-SIP-Publish-Expire-VOS3000-SIP-Display-From.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Call-Progress-Timeout-VOS3000-SIP-Outbound-Registration-Parameters-VOS3000-SIP-Privacy-Header-VOS3000-SIP-Routing-Gateway-Contact-VOS3000-SIP-Publish-Expire-VOS3000-SIP-Display-From.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Call-Progress-Timeout-VOS3000-SIP-Outbound-Registration-Parameters-VOS3000-SIP-Privacy-Header-VOS3000-SIP-Routing-Gateway-Contact-VOS3000-SIP-Publish-Expire-VOS3000-SIP-Display-From.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Call-Progress-Timeout-VOS3000-SIP-Outbound-Registration-Parameters-VOS3000-SIP-Privacy-Header-VOS3000-SIP-Routing-Gateway-Contact-VOS3000-SIP-Publish-Expire-VOS3000-SIP-Display-From.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":2663,"url":"https:\/\/multahost.com\/blog\/vos3000-codec-priority-configuration\/","url_meta":{"origin":3383,"position":2},"title":"VOS3000 Codec Priority Configuration: Smart Audio Quality Settings Guide","author":"king","date":"April 9, 2026","format":false,"excerpt":"VOS3000 codec priority configuration guide for optimal audio quality. Learn G711, G729, G723 codec settings, transcoding setup, and bandwidth optimization tips.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"VOS3000 database optimization, VOS3000 Wholesale VoIP Business, VOS3000 Codec Priority Configuration, VOS3000 Emerging Markets Deployment, VOS3000 Webhook Callback Configuration","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-database-optimization-VOS3000-Wholesale-VoIP-Business-VOS3000-Codec-Priority-Configuration-VOS3000-Emerging-Markets-Deployment-VOS3000-Webhook-Callback-Configuration-3.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\/04\/VOS3000-database-optimization-VOS3000-Wholesale-VoIP-Business-VOS3000-Codec-Priority-Configuration-VOS3000-Emerging-Markets-Deployment-VOS3000-Webhook-Callback-Configuration-3.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-database-optimization-VOS3000-Wholesale-VoIP-Business-VOS3000-Codec-Priority-Configuration-VOS3000-Emerging-Markets-Deployment-VOS3000-Webhook-Callback-Configuration-3.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-database-optimization-VOS3000-Wholesale-VoIP-Business-VOS3000-Codec-Priority-Configuration-VOS3000-Emerging-Markets-Deployment-VOS3000-Webhook-Callback-Configuration-3.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-database-optimization-VOS3000-Wholesale-VoIP-Business-VOS3000-Codec-Priority-Configuration-VOS3000-Emerging-Markets-Deployment-VOS3000-Webhook-Callback-Configuration-3.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":1810,"url":"https:\/\/multahost.com\/blog\/vos3000-sip-trunk\/","url_meta":{"origin":3383,"position":3},"title":"VOS3000 SIP Trunk Configuration Guide \u2013 Connect Best Carriers &amp; Gateways","author":"king","date":"March 13, 2026","format":false,"excerpt":"VOS3000 SIP trunk configuration guide for VoIP operators. 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Configure named allow\/deny groups, assign to accounts and gateways, and build layered rules.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"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","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-System-White-List-VOS3000-Callee-Balance-Verification-VOS3000-Dial-Plan-Wildcards-VOS3000-Number-Length-Matching-2.png?fit=1200%2C660&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-System-White-List-VOS3000-Callee-Balance-Verification-VOS3000-Dial-Plan-Wildcards-VOS3000-Number-Length-Matching-2.png?fit=1200%2C660&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-System-White-List-VOS3000-Callee-Balance-Verification-VOS3000-Dial-Plan-Wildcards-VOS3000-Number-Length-Matching-2.png?fit=1200%2C660&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-System-White-List-VOS3000-Callee-Balance-Verification-VOS3000-Dial-Plan-Wildcards-VOS3000-Number-Length-Matching-2.png?fit=1200%2C660&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-System-White-List-VOS3000-Callee-Balance-Verification-VOS3000-Dial-Plan-Wildcards-VOS3000-Number-Length-Matching-2.png?fit=1200%2C660&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3180,"url":"https:\/\/multahost.com\/blog\/vos3000-sip-response-codes\/","url_meta":{"origin":3383,"position":5},"title":"VOS3000 SIP Response Codes CDR Complete 30-Plus Important Code Reference","author":"king","date":"April 21, 2026","format":false,"excerpt":"VOS3000 SIP response codes CDR reference with 30+ codes. 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