{"id":3379,"date":"2026-04-28T13:42:47","date_gmt":"2026-04-28T13:42:47","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3379"},"modified":"2026-04-28T13:58:45","modified_gmt":"2026-04-28T13:58:45","slug":"vos3000-callee-balance","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-callee-balance\/","title":{"rendered":"VOS3000 Callee Balance Verification: Important SERVER_PHONE_AS_CALLEE_MONEY_VERIFY"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-callee-balance-verification-essential-server-phone-as-callee-money-verify\">VOS3000 Callee Balance Verification: Essential SERVER_PHONE_AS_CALLEE_MONEY_VERIFY<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde Every VOS3000 operator faces a critical revenue protection question: should you allow inbound calls to accounts that have zero or negative balance? Without <strong>VOS3000 callee balance verification<\/strong>, a SIP phone account with zero funds can receive unlimited incoming calls completely free \u2014 consuming gateway ports, softswitch processing resources, and potentially terminating to expensive outbound routes that generate costs without any corresponding revenue. The SERVER_PHONE_AS_CALLEE_MONEY_VERIFY parameter gives you the control to prevent this scenario entirely. \ud83d\udd27<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2699\ufe0f The VOS3000 2.1.9.07 manual \u00a74.3.5.1 defines <strong>SERVER_PHONE_AS_CALLEE_MONEY_VERIFY<\/strong> as a server parameter that verifies the callee phone account&#8217;s balance before allowing the call to proceed. When this parameter is set to &#8220;on&#8221; (which is the default), VOS3000 checks whether the called party&#8217;s phone account has sufficient balance to cover the call. If the account balance is zero or insufficient, the call is rejected. This simple but powerful check prevents free inbound calls to depleted accounts, protecting your revenue and preventing resource abuse. \ud83d\udcca<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf This guide covers every aspect of <strong>VOS3000 callee balance verification<\/strong>: how SERVER_PHONE_AS_CALLEE_MONEY_VERIFY works, when to enable or disable it, how it interacts with prepaid and postpaid billing models, and practical configuration examples for different VoIP business scenarios. 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-callee-balance-verification-essential-server-phone-as-callee-money-verify\">VOS3000 Callee Balance Verification: Essential SERVER_PHONE_AS_CALLEE_MONEY_VERIFY<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-vos-3000-callee-balance-verification\">\ud83d\udd10 What Is VOS3000 Callee Balance Verification?<\/a><ul><li><a href=\"#\ud83d\udccb-server-phone-as-callee-money-verify-parameter-reference\">\ud83d\udccb SERVER_PHONE_AS_CALLEE_MONEY_VERIFY Parameter Reference<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-how-vos-3000-callee-balance-verification-works\">\u2699\ufe0f How VOS3000 Callee Balance Verification Works<\/a><\/li><li><a href=\"#\ud83d\udcca-when-to-enable-or-disable-vos-3000-callee-balance-verification\">\ud83d\udcca When to Enable or Disable VOS3000 Callee Balance Verification<\/a><\/li><li><a href=\"#\ud83d\udd04-callee-balance-verification-and-reverse-charging-scenarios\">\ud83d\udd04 Callee Balance Verification and Reverse Charging Scenarios<\/a><\/li><li><a href=\"#\ud83d\udda5\ufe0f-step-by-step-vos-3000-callee-balance-verification-configuration\">\ud83d\udda5\ufe0f Step-by-Step VOS3000 Callee Balance Verification Configuration<\/a><ul><li><a href=\"#step-1-access-server-parameters-\ud83c\udf10\">Step 1: Access Server Parameters \ud83c\udf10<\/a><\/li><li><a href=\"#step-2-configure-the-parameter-\u23f0\">Step 2: Configure the Parameter \u23f0<\/a><\/li><li><a href=\"#step-3-verify-configuration-\ud83d\udd0d\">Step 3: Verify Configuration \ud83d\udd0d<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-vos-3000-callee-balance-verification-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 Callee Balance Verification Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-legitimate-inbound-calls-being-rejected\">\u274c Problem 1: Legitimate Inbound Calls Being Rejected<\/a><\/li><li><a href=\"#\u274c-problem-2-zero-balance-accounts-still-receiving-calls\">\u274c Problem 2: Zero-Balance Accounts Still Receiving Calls<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udca1-vos-3000-callee-balance-verification-best-practices\">\ud83d\udca1 VOS3000 Callee Balance Verification Best Practices<\/a><\/li><li><a href=\"#\ud83d\udcca-complete-vos-3000-callee-balance-verification-reference\">\ud83d\udcca Complete VOS3000 Callee Balance Verification Reference<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-vos-3000-callee-balance-verification\">\u2753 What is VOS3000 callee balance verification?<\/a><\/li><li><a href=\"#\u2753-should-i-enable-or-disable-server-phone-as-callee-money-verify\">\u2753 Should I enable or disable SERVER_PHONE_AS_CALLEE_MONEY_VERIFY?<\/a><\/li><li><a href=\"#\u2753-how-does-callee-balance-verification-work-with-postpaid-accounts\">\u2753 How does callee balance verification work with postpaid accounts?<\/a><\/li><li><a href=\"#\u2753-what-happens-when-a-zero-balance-account-receives-an-inbound-call\">\u2753 What happens when a zero-balance account receives an inbound call?<\/a><\/li><li><a href=\"#\u2753-does-callee-balance-verification-affect-outbound-calls\">\u2753 Does callee balance verification affect outbound calls?<\/a><\/li><li><a href=\"#\u2753-can-i-set-callee-balance-verification-per-account-instead-of-globally\">\u2753 Can I set callee balance verification per account instead of globally?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-expert-help-with-vos-3000-callee-balance-verification\">\ud83d\udcde Need Expert Help with VOS3000 Callee Balance Verification?<\/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-callee-balance-verification\">\ud83d\udd10 What Is VOS3000 Callee Balance Verification?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f <strong>VOS3000 callee balance verification<\/strong> is a billing security feature that checks the called party&#8217;s account balance before accepting an inbound call. When a call arrives at VOS3000 destined for a registered SIP phone (a &#8220;callee&#8221; in VOS3000 terminology), the softswitch evaluates whether that phone&#8217;s associated account has sufficient funds to cover the potential call charges. If the balance is insufficient, the call is rejected before any gateway resources are allocated. \ud83d\udcde<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Why this matters:<\/strong> In a typical VOS3000 deployment, phone accounts represent end-user SIP extensions that register to the softswitch. When someone calls these extensions from the PSTN or another VoIP network, the call enters through a mapping gateway and is routed to the phone. Without callee balance verification, the phone receives the call regardless of its account balance \u2014 meaning a phone account with zero funds can consume inbound call resources indefinitely. This creates a revenue leakage vector where the operator pays for inbound gateway capacity and potential outbound termination costs while collecting zero revenue from the zero-balance account.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccd <strong>Location in VOS3000 Client:<\/strong> Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 Server parameter<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-server-phone-as-callee-money-verify-parameter-reference\">\ud83d\udccb SERVER_PHONE_AS_CALLEE_MONEY_VERIFY Parameter Reference<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udf10 According to the VOS3000 2.1.9.07 manual \u00a74.3.5.1:<\/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_PHONE_AS_CALLEE_MONEY_VERIFY<\/td><\/tr><tr><td>\ud83d\udd22 Default Value<\/td><td>On<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>Verify callee phone account balance<\/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<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-how-vos-3000-callee-balance-verification-works\">\u2699\ufe0f How VOS3000 Callee Balance Verification Works<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 When <strong>VOS3000 callee balance verification<\/strong> is enabled (On), the softswitch performs the following check for every inbound call to a phone account:<\/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\">Step<\/th><th class=\"has-text-align-left\" data-align=\"left\">Action<\/th><th class=\"has-text-align-left\" data-align=\"left\">Result<\/th><\/tr><tr><td>1. Call arrives<\/td><td>Inbound INVITE received for a registered phone account<\/td><td>VOS3000 identifies the callee phone account<\/td><\/tr><tr><td>2. Balance check<\/td><td>VOS3000 queries the phone account&#8217;s current balance<\/td><td>Balance value retrieved from account database<\/td><\/tr><tr><td>3. Evaluation<\/td><td>Is the account balance sufficient (greater than zero)?<\/td><td>Yes \u2192 proceed; No \u2192 reject call<\/td><\/tr><tr><td>4. Call handling<\/td><td>Sufficient balance: call is connected; Insufficient: call is rejected<\/td><td>Rejected calls return appropriate SIP error response<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Balance threshold:<\/strong> The <strong>VOS3000 callee balance verification<\/strong> checks whether the account has a positive balance (greater than zero). Even a balance of 0.01 would typically allow the call to proceed, while a balance of exactly 0.00 or a negative balance would cause the call to be rejected. This aligns with the prepaid billing model where accounts must maintain a positive balance to receive service.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-when-to-enable-or-disable-vos-3000-callee-balance-verification\">\ud83d\udcca When to Enable or Disable VOS3000 Callee Balance Verification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf The decision to enable or disable <strong>VOS3000 callee balance verification<\/strong> depends on your business model and how you charge for inbound calls:<\/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\">Business Model<\/th><th class=\"has-text-align-left\" data-align=\"left\">Setting<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rationale<\/th><\/tr><tr><td>Prepaid SIP phone accounts<\/td><td>On (default)<\/td><td>\u2705 Prevents free calls to depleted accounts; protects revenue<\/td><\/tr><tr><td>Postpaid SIP phone accounts<\/td><td>Off<\/td><td>\ud83d\udd27 Postpaid accounts are billed after the fact; balance check is unnecessary<\/td><\/tr><tr><td>Free inbound DID service<\/td><td>Off<\/td><td>\ud83d\udcde Inbound calls are free by design; balance should not block them<\/td><\/tr><tr><td>Wholesale termination only<\/td><td>On (default)<\/td><td>\ud83d\udee1\ufe0f Zero-balance wholesale accounts should not receive free calls<\/td><\/tr><tr><td>Mixed prepaid\/postpaid<\/td><td>On<\/td><td>\ud83d\udcca Keep on; manage postpaid accounts by ensuring they always have positive balance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd11 <strong>Recommendation:<\/strong> Keep <strong>VOS3000 callee balance verification<\/strong> enabled (On) unless you have a specific business reason to allow free inbound calls. The default On setting protects against the most common revenue leakage scenario. For postpaid accounts, maintain a positive administrative balance so they pass the verification check while still being billed at the end of the billing period.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd04-callee-balance-verification-and-reverse-charging-scenarios\">\ud83d\udd04 Callee Balance Verification and Reverse Charging Scenarios<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udee1\ufe0f In some VoIP deployments, the callee (called party) is the one being billed for the call rather than the caller. This is known as reverse charging or collect calling. The <strong>VOS3000 callee balance verification<\/strong> plays a critical role in these scenarios because it ensures the party responsible for payment actually has the funds to cover the charge.<\/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\">Callee Balance Verify<\/th><th class=\"has-text-align-left\" data-align=\"left\">Expected Behavior<\/th><\/tr><tr><td>Normal calling \u2014 caller pays<\/td><td>On<\/td><td>Callee balance is checked; zero-balance callees cannot receive calls<\/td><\/tr><tr><td>Reverse charging \u2014 callee pays<\/td><td>On<\/td><td>Essential \u2014 the paying party must have funds before the call is allowed<\/td><\/tr><tr><td>Toll-free inbound \u2014 no charge<\/td><td>Off<\/td><td>Balance check would block legitimate free calls; disable it<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Reverse charging implication:<\/strong> When your billing model charges the callee for inbound calls, <strong>VOS3000 callee balance verification<\/strong> is not just a security measure \u2014 it is a fundamental billing integrity requirement. Without it, reverse-charged calls to zero-balance accounts would be connected, and the operator would have no way to collect the charges, resulting in direct revenue loss.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udda5\ufe0f-step-by-step-vos-3000-callee-balance-verification-configuration\">\ud83d\udda5\ufe0f Step-by-Step VOS3000 Callee Balance Verification Configuration<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-access-server-parameters-\ud83c\udf10\">Step 1: Access Server 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 Server parameter<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Locate <strong>SERVER_PHONE_AS_CALLEE_MONEY_VERIFY<\/strong> in the parameter list<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-configure-the-parameter-\u23f0\">Step 2: Configure the Parameter \u23f0<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u270f\ufe0f Set the value to <strong>On<\/strong> to enable callee balance verification (recommended for most deployments)<\/li>\n\n\n\n<li>\u270f\ufe0f Set the value to <strong>Off<\/strong> only if your business model requires free inbound calls to all accounts<\/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-configuration-\ud83d\udd0d\">Step 3: Verify Configuration \ud83d\udd0d<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcde Test with a zero-balance phone account \u2014 inbound calls should be rejected when On<\/li>\n\n\n\n<li>\ud83d\udcca Check CDR records to confirm that rejected calls show the appropriate failure reason<\/li>\n\n\n\n<li>\ud83d\udd27 Test with a positive-balance account \u2014 inbound calls should connect normally<\/li>\n\n\n\n<li>\ud83d\udcc8 Review the <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">billing system guide<\/a> for additional configuration context<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-vos-3000-callee-balance-verification-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 Callee Balance Verification Problems and Solutions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-legitimate-inbound-calls-being-rejected\">\u274c Problem 1: Legitimate Inbound Calls Being Rejected<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> Phone accounts that should be able to receive calls are being rejected with balance-related errors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The accounts may have zero or negative balance, or the verification parameter is set to On when your business model requires free inbound calls.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Check the account balance \u2014 if it is zero, add funds or set up a billing package<\/li>\n\n\n\n<li>\ud83d\udcca For postpaid accounts, maintain an administrative positive balance that reflects the credit limit<\/li>\n\n\n\n<li>\ud83d\udcde If your service offers free inbound calls, set SERVER_PHONE_AS_CALLEE_MONEY_VERIFY to Off<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-zero-balance-accounts-still-receiving-calls\">\u274c Problem 2: Zero-Balance Accounts Still Receiving Calls<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> Accounts with zero balance can still receive inbound calls, consuming resources without revenue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The SERVER_PHONE_AS_CALLEE_MONEY_VERIFY parameter may be set to Off, or the call may be routing through a gateway that bypasses the phone account balance check.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd27 Verify SERVER_PHONE_AS_CALLEE_MONEY_VERIFY is set to On in <a href=\"https:\/\/multahost.com\/blog\/vos3000-system-parameter\/\">system parameters<\/a><\/li>\n\n\n\n<li>\ud83d\udcca Check that the inbound call is actually targeting a phone account (not a gateway-only route)<\/li>\n\n\n\n<li>\ud83d\udcde Review your <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-routing\/\">call routing configuration<\/a> to ensure proper account association<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udca1-vos-3000-callee-balance-verification-best-practices\">\ud83d\udca1 VOS3000 Callee Balance Verification 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 Keep verification On by default<\/td><td>SERVER_PHONE_AS_CALLEE_MONEY_VERIFY = On<\/td><td>\u2705 Prevents revenue leakage from zero-balance accounts<\/td><\/tr><tr><td>\ud83d\udd27 Manage postpaid balances<\/td><td>Keep positive administrative balance on postpaid accounts<\/td><td>\ud83c\udfaf Postpaid accounts pass verification while being billed later<\/td><\/tr><tr><td>\ud83d\udd04 Monitor zero-balance accounts<\/td><td>Set up balance alarms for accounts approaching zero<\/td><td>\ud83d\udee1\ufe0f Proactive notification before service disruption<\/td><\/tr><tr><td>\ud83d\udccb Document your billing model<\/td><td>Clearly define which accounts are prepaid vs postpaid<\/td><td>\ud83d\udcde Determines whether callee verification should block or allow<\/td><\/tr><tr><td>\ud83d\udcc8 Test after configuration changes<\/td><td>Always test with zero-balance and positive-balance accounts<\/td><td>\ud83d\udd27 Verifies correct behavior in both scenarios<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Pro tip:<\/strong> Combine <strong>VOS3000 callee balance verification<\/strong> with the <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-overdraft-prevention\/\">billing overdraft prevention<\/a> parameter (SERVER_BILLING_PREVENT_OVERDRAFT_ADVANCE_TIME) for maximum revenue protection. The overdraft prevention parameter reserves advance time to prevent accounts from going negative during active calls, while callee verification blocks new calls to already-depleted accounts. Together, these two parameters create a comprehensive revenue protection framework. For SIP account management standards, see <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc3261\" target=\"_blank\" rel=\"noopener\">RFC 3261<\/a>. For complex billing configurations, reach us at <strong>+8801911119966<\/strong>. \ud83d\udd27<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-complete-vos-3000-callee-balance-verification-reference\">\ud83d\udcca Complete VOS3000 Callee Balance Verification Reference<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb Complete reference sourced from the VOS3000 2.1.9.07 manual \u00a74.3.5.1:<\/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\">Details<\/th><\/tr><tr><td>Parameter Name<\/td><td>SERVER_PHONE_AS_CALLEE_MONEY_VERIFY<\/td><\/tr><tr><td>Default Value<\/td><td>On<\/td><\/tr><tr><td>Possible Values<\/td><td>On \/ Off<\/td><\/tr><tr><td>Description<\/td><td>Verify callee phone account balance<\/td><\/tr><tr><td>Manual Section<\/td><td>\u00a74.3.5.1 \u2014 Server Parameters (Billing)<\/td><\/tr><tr><td>Effect When On<\/td><td>VOS3000 checks the called phone account&#8217;s balance before allowing the call; zero-balance accounts are rejected<\/td><\/tr><tr><td>Effect When Off<\/td><td>VOS3000 does not check the called phone account&#8217;s balance; all inbound calls are allowed regardless of balance<\/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-vos-3000-callee-balance-verification\">\u2753 What is VOS3000 callee balance verification?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f <strong>VOS3000 callee balance verification<\/strong> is a server parameter called SERVER_PHONE_AS_CALLEE_MONEY_VERIFY that checks the called party&#8217;s phone account balance before allowing an inbound call to proceed. When enabled (On, which is the default), VOS3000 verifies that the callee&#8217;s account has sufficient balance. If the balance is zero or negative, the call is rejected. This prevents zero-balance accounts from receiving free inbound calls that consume resources without generating revenue. The parameter is documented in the VOS3000 2.1.9.07 manual \u00a74.3.5.1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-should-i-enable-or-disable-server-phone-as-callee-money-verify\">\u2753 Should I enable or disable SERVER_PHONE_AS_CALLEE_MONEY_VERIFY?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 For most VOS3000 deployments, you should keep SERVER_PHONE_AS_CALLEE_MONEY_VERIFY set to On (the default). This prevents revenue leakage by blocking inbound calls to zero-balance accounts. You should only disable it (set to Off) if your business model provides free inbound calls to all phone accounts regardless of balance \u2014 for example, if you offer a toll-free DID service where inbound calls are never charged to the callee. If you operate a prepaid model, enabling this parameter is essential for revenue protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-does-callee-balance-verification-work-with-postpaid-accounts\">\u2753 How does callee balance verification work with postpaid accounts?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb For postpaid accounts, the <strong>VOS3000 callee balance verification<\/strong> check still applies \u2014 the account must have a positive balance to receive inbound calls. The common practice is to maintain a positive administrative balance on postpaid accounts that represents their credit limit. For example, a postpaid account with a $100 credit limit would have its balance set to $100, which decreases as calls are made and is reset at the end of each billing period. This way, postpaid accounts pass the verification check while still being billed on a monthly cycle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-happens-when-a-zero-balance-account-receives-an-inbound-call\">\u2753 What happens when a zero-balance account receives an inbound call?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde When <strong>VOS3000 callee balance verification<\/strong> is enabled and a call arrives for a phone account with zero or negative balance, VOS3000 rejects the call with an appropriate SIP error response before allocating any gateway resources. The caller hears a rejection tone or receives a SIP error code. No CDR with billable duration is generated for the rejected call. The rejection prevents the zero-balance account from consuming port capacity, gateway resources, or generating costs for the operator.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-does-callee-balance-verification-affect-outbound-calls\">\u2753 Does callee balance verification affect outbound calls?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd04 No, SERVER_PHONE_AS_CALLEE_MONEY_VERIFY specifically controls inbound call behavior \u2014 when a phone account is the callee (receiving party). Outbound calls from the same account are controlled by different billing parameters, such as the account&#8217;s prepaid balance check during call setup. The <strong>VOS3000 callee balance verification<\/strong> is a separate check that only applies when the phone account is being called, not when it is making a call.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-set-callee-balance-verification-per-account-instead-of-globally\">\u2753 Can I set callee balance verification per account instead of globally?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcca The SERVER_PHONE_AS_CALLEE_MONEY_VERIFY parameter is a global server parameter that applies to all phone accounts on the VOS3000 system. There is no per-account override for this specific parameter. However, you can effectively achieve per-account behavior by managing account balances \u2014 accounts that should always receive inbound calls can maintain a positive balance, while accounts that should be blocked will naturally reach zero balance. For more granular access control, consider using the <a href=\"https:\/\/multahost.com\/blog\/vos3000-dynamic-blacklist-anti-fraud\/\">dynamic blacklist<\/a> feature. For SIP account management standards, see <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc3261\" target=\"_blank\" rel=\"noopener\">RFC 3261<\/a>.<\/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<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-expert-help-with-vos-3000-callee-balance-verification\">\ud83d\udcde Need Expert Help with VOS3000 Callee Balance Verification?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 Proper <strong>VOS3000 callee balance verification<\/strong> configuration is essential for revenue protection, preventing free inbound calls to zero-balance accounts, and maintaining billing integrity across your VoIP network. Misconfigured callee verification leads to revenue leakage, unauthorized resource consumption, and billing disputes. Whether you need help configuring SERVER_PHONE_AS_CALLEE_MONEY_VERIFY, designing prepaid billing strategies, or integrating callee verification with your overall billing system, our team is ready to assist. Reach us on WhatsApp at <strong>+8801911119966<\/strong> for professional VOS3000 support and configuration 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 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 callee balance verification with SERVER_PHONE_AS_CALLEE_MONEY_VERIFY. Prevent free inbound calls to zero-balance accounts and protect revenue.<\/p>\n","protected":false},"author":1,"featured_media":3372,"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_feature_clip_id":0,"_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":[10735,10760,10748,10734,10764,10746,10721,10739,10720,10743,10753,10725,10717,10736,10762,10719,10755,10754,10758,10727,10750,10722,10741,10740,10730,10745,10728,10749,10731,10738,10737,10752,10757,10742,10723,10726,10747,10718,10729,10751,10733,10744,10761,10732,10756,10763,10724,10759],"class_list":["post-3379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000","tag-vos3000-account-balance-before-call","tag-vos3000-account-overdraft-prevention","tag-vos3000-additional-settings-callee","tag-vos3000-billing-parameter-callee","tag-vos3000-billing-security-parameter","tag-vos3000-billing-system-parameter","tag-vos3000-called-party-balance","tag-vos3000-called-party-money-check","tag-vos3000-callee-account-balance-check","tag-vos3000-callee-account-verification","tag-vos3000-callee-balance-on-off","tag-vos3000-callee-balance-parameter","tag-vos3000-callee-balance-verification","tag-vos3000-callee-balance-zero-reject","tag-vos3000-callee-billing-mode","tag-vos3000-callee-money-verify","tag-vos3000-disable-callee-money-verify","tag-vos3000-enable-callee-balance-check","tag-vos3000-free-call-blocking","tag-vos3000-free-inbound-call-prevention","tag-vos3000-gateway-balance-verification","tag-vos3000-inbound-call-balance-check","tag-vos3000-inbound-call-rating","tag-vos3000-incoming-call-billing","tag-vos3000-mapping-gateway-callee-balance","tag-vos3000-operation-management-callee","tag-vos3000-phone-account-balance-verification","tag-vos3000-phone-account-configuration","tag-vos3000-phone-gateway-balance-verify","tag-vos3000-postpaid-callee-verification","tag-vos3000-prepaid-account-callee","tag-vos3000-registered-phone-balance","tag-vos3000-revenue-protection-callee","tag-vos3000-reverse-billing-vos3000","tag-vos3000-reverse-charging-balance","tag-vos3000-server-parameter-callee-money","tag-vos3000-server-parameters-billing","tag-vos3000-server_phone_as_callee_money_verify","tag-vos3000-sip-account-balance-check","tag-vos3000-sip-phone-balance","tag-vos3000-softswitch-callee-verify","tag-vos3000-softswitch-management-balance","tag-vos3000-softswitch-parameter-guide","tag-vos3000-voip-balance-verification","tag-vos3000-voip-billing-prevention","tag-vos3000-vos3000-balance-verification-setup","tag-vos3000-zero-balance-account-blocking","tag-vos3000-zero-balance-inbound"],"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-1.png?fit=1692%2C930&ssl=1?v=1777380455","jetpack-related-posts":[{"id":3209,"url":"https:\/\/multahost.com\/blog\/vos3000-callee-source-header\/","url_meta":{"origin":3379,"position":0},"title":"VOS3000 Callee Source Header Flexible To Request-Line Selection Important","author":"king","date":"April 21, 2026","format":false,"excerpt":"VOS3000 callee source header selects destination number from To header or Request-Line. Configure dialed number extraction for accurate routing and billing.","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-1.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-1.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-1.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-1.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-1.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3278,"url":"https:\/\/multahost.com\/blog\/vos3000-cdr-end-direction\/","url_meta":{"origin":3379,"position":1},"title":"VOS3000 CDR End Direction Critical Call Termination Party Detection","author":"king","date":"April 26, 2026","format":false,"excerpt":"Master VOS3000 CDR end direction codes 0, 1, and 2. Learn who hung up each call \u2014 caller, callee, or server \u2014 and why this matters for billing disputes, quality analysis, and fraud detection.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"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","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/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=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-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=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/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=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/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=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/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=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3162,"url":"https:\/\/multahost.com\/blog\/vos3000-sip-routing-gateway-contact\/","url_meta":{"origin":3379,"position":2},"title":"VOS3000 SIP Routing Gateway Contact: Essential INVITE Header Guide","author":"king","date":"April 21, 2026","format":false,"excerpt":"Master VOS3000 SIP routing gateway contact with SS_SIP_ROUTING_GATEWAY_INVITE_USE_CONTACT. 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