{"id":3122,"date":"2026-04-20T02:37:18","date_gmt":"2026-04-20T02:37:18","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3122"},"modified":"2026-04-20T02:54:15","modified_gmt":"2026-04-20T02:54:15","slug":"vos3000-sip-no-timer-call-duration","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-sip-no-timer-call-duration\/","title":{"rendered":"VOS3000 SIP No Timer Call Duration: Important Maximum Limit Easy Guide"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-sip-no-timer-call-duration-important-maximum-limit-guide\">VOS3000 SIP No Timer Call Duration: Important Maximum Limit Guide<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde Have you ever discovered <strong>runaway calls<\/strong> in your CDR records \u2014 sessions lasting hours beyond the actual conversation? The <strong>VOS3000 SIP no timer call duration<\/strong> parameter is your ultimate safety net. When SIP endpoints do not support session timers, this critical setting enforces a hard maximum limit, preventing zombie calls from draining your VoIP revenue. \u23f1\ufe0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udea8 Not every SIP device implements <strong>RFC 4028 session timers<\/strong>. Legacy gateways, softphones, and some SIP trunks simply never include a <strong>Session-Expires<\/strong> header in their INVITE messages. For these non-timer endpoints, VOS3000 cannot actively verify if the call is still alive \u2014 and without a hard cap, orphaned calls can run indefinitely, generating phantom charges. The <strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong> parameter solves this by imposing a maximum conversation time that VOS3000 enforces automatically. \ud83d\udd10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf This guide covers everything about the VOS3000 SIP no timer call duration \u2014 from the official default of <strong>7200 seconds (2 hours)<\/strong> to recommended values by deployment type, its relationship with session timers, and step-by-step configuration to protect your billing accuracy.<\/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-sip-no-timer-call-duration-important-maximum-limit-guide\">VOS3000 SIP No Timer Call Duration: Important Maximum Limit Guide<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-vos-3000-sip-no-timer-call-duration\">\ud83d\udd10 What Is VOS3000 SIP No Timer Call Duration?<\/a><ul><li><a href=\"#\ud83d\udccb-official-parameter-specification\">\ud83d\udccb Official Parameter Specification<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd04-vos-3000-sip-no-timer-call-duration-vs-session-timer\">\ud83d\udd04 VOS3000 SIP No Timer Call Duration vs. Session Timer<\/a><ul><li><a href=\"#\ud83c\udfaf-how-vos-3000-decides-which-mechanism-to-use\">\ud83c\udfaf How VOS3000 Decides Which Mechanism to Use<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-ss-sip-no-timer-reinvite-interval-deep-dive\">\u2699\ufe0f SS_SIP_NO_TIMER_REINVITE_INTERVAL \u2014 Deep Dive<\/a><ul><li><a href=\"#\ud83d\udd11-how-the-parameter-works\">\ud83d\udd11 How the Parameter Works<\/a><\/li><li><a href=\"#\ud83d\udcca-duration-conversion-table\">\ud83d\udcca Duration Conversion Table<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udee1\ufe0f-preventing-runaway-calls-with-vos-3000-sip-no-timer-call-duration\">\ud83d\udee1\ufe0f Preventing Runaway Calls with VOS3000 SIP No Timer Call Duration<\/a><ul><li><a href=\"#\u26a0\ufe0f-how-runaway-calls-happen\">\u26a0\ufe0f How Runaway Calls Happen<\/a><\/li><li><a href=\"#\ud83d\udcca-runaway-call-cost-impact-table\">\ud83d\udcca Runaway Call Cost Impact Table<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-vos-3000-sip-no-timer-call-duration-and-billing-accuracy\">\ud83d\udcca VOS3000 SIP No Timer Call Duration and Billing Accuracy<\/a><ul><li><a href=\"#\ud83d\udd10-billing-impact-analysis\">\ud83d\udd10 Billing Impact Analysis<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd27-step-by-step-configuration-of-vos-3000-sip-no-timer-call-duration\">\ud83d\udd27 Step-by-Step Configuration of VOS3000 SIP No Timer Call Duration<\/a><ul><li><a href=\"#step-1-navigate-to-sip-parameters-\ud83d\udccb\">Step 1: Navigate to SIP Parameters \ud83d\udccb<\/a><\/li><li><a href=\"#step-2-choose-your-value-\u23f1\ufe0f\">Step 2: Choose Your Value \u23f1\ufe0f<\/a><\/li><li><a href=\"#step-3-apply-and-save-\u2705\">Step 3: Apply and Save \u2705<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd04-relationship-with-other-vos-3000-parameters\">\ud83d\udd04 Relationship with Other VOS3000 Parameters<\/a><ul><li><a href=\"#\ud83d\udccb-parameter-interaction-flow\">\ud83d\udccb Parameter Interaction Flow<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udca1-best-practices-for-vos-3000-sip-no-timer-call-duration\">\ud83d\udca1 Best Practices for VOS3000 SIP No Timer Call Duration<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-problems-and-troubleshooting\">\ud83d\udee1\ufe0f Common Problems and Troubleshooting<\/a><ul><li><a href=\"#\u274c-problem-1-calls-being-cut-after-exactly-2-hours\">\u274c Problem 1: Calls Being Cut After Exactly 2 Hours<\/a><\/li><li><a href=\"#\u274c-problem-2-ultra-long-bills-from-non-timer-endpoints\">\u274c Problem 2: Ultra-Long Bills from Non-Timer Endpoints<\/a><\/li><li><a href=\"#\u274c-problem-3-not-sure-which-endpoints-support-session-timers\">\u274c Problem 3: Not Sure Which Endpoints Support Session Timers<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-complete-vos-3000-sip-no-timer-call-duration-decision-matrix\">\ud83d\udcca Complete VOS3000 SIP No Timer Call Duration Decision Matrix<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-the-default-vos-3000-sip-no-timer-call-duration\">\u2753 What is the default VOS3000 SIP no timer call duration?<\/a><\/li><li><a href=\"#\u2753-what-happens-when-vos-3000-sip-no-timer-call-duration-is-exceeded\">\u2753 What happens when VOS3000 SIP no timer call duration is exceeded?<\/a><\/li><li><a href=\"#\u2753-how-is-vos-3000-sip-no-timer-call-duration-different-from-session-timer\">\u2753 How is VOS3000 SIP no timer call duration different from session timer?<\/a><\/li><li><a href=\"#\u2753-can-i-set-ss-sip-no-timer-reinvite-interval-to-unlimited\">\u2753 Can I set SS_SIP_NO_TIMER_REINVITE_INTERVAL to unlimited?<\/a><\/li><li><a href=\"#\u2753-does-vos-3000-sip-no-timer-call-duration-affect-calls-that-support-session-timers\">\u2753 Does VOS3000 SIP no timer call duration affect calls that support session timers?<\/a><\/li><li><a href=\"#\u2753-how-do-i-check-if-my-sip-endpoints-support-session-timers\">\u2753 How do I check if my SIP endpoints support session timers?<\/a><\/li><li><a href=\"#\u2753-should-ss-sip-no-timer-reinvite-interval-be-higher-or-lower-than-ss-sip-session-ttl\">\u2753 Should SS_SIP_NO_TIMER_REINVITE_INTERVAL be higher or lower than SS_SIP_SESSION_TTL?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-expert-help-with-vos-3000-sip-no-timer-call-duration\">\ud83d\udcde Need Expert Help with VOS3000 SIP No Timer Call Duration?<\/a><\/li><li><a href=\"#\ud83d\udcda-related-resources\">\ud83d\udcda Related Resources<\/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-sip-no-timer-call-duration\">\ud83d\udd10 What Is VOS3000 SIP No Timer Call Duration?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f0 The <strong>VOS3000 SIP no timer call duration<\/strong> is controlled by the parameter <strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong>. It defines the maximum allowed conversation time for SIP callers that do NOT support the &#8220;timer&#8221; feature as defined in <strong>RFC 4028<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Why this matters:<\/strong> When a SIP caller supports session timers, VOS3000 can periodically send re-INVITE or UPDATE messages to confirm the call is still connected. But when the caller does <em>not<\/em> support timers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u274c No re-INVITE or UPDATE messages can be sent to verify the session<\/li>\n\n\n\n<li>\u274c VOS3000 cannot detect whether the far end is still alive<\/li>\n\n\n\n<li>\u26a0\ufe0f The only protection is a hard timeout \u2014 once exceeded, the call is forcibly terminated<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f Without this parameter, zombie calls could persist indefinitely<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccd <strong>Location in VOS3000 Client:<\/strong> Navigation \u2192 Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 SIP parameter<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-official-parameter-specification\">\ud83d\udccb Official Parameter Specification<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 According to the VOS3000 2.1.9.07 Official Manual (Table 4-3, Section 4.3.5.2):<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Attribute<\/th><th class=\"has-text-align-left\" data-align=\"left\">Value<\/th><\/tr><tr><td>\ud83d\udccc Parameter Name<\/td><td>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/td><\/tr><tr><td>\ud83d\udd22 Default Value<\/td><td>7200<\/td><\/tr><tr><td>\ud83d\udcd0 Unit<\/td><td>Seconds<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>Maximum Conversation Time for Non-TIMER SIP Caller. If SIP caller doesn&#8217;t support &#8220;timer&#8221;, softswitch will stop the call when the time is up.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f <strong>Default of 7200 seconds = 2 hours.<\/strong> This means that by default, a call from a non-timer SIP endpoint will be forcibly terminated after 2 hours of continuous conversation \u2014 regardless of whether the call is still active or has become a zombie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd04-vos-3000-sip-no-timer-call-duration-vs-session-timer\">\ud83d\udd04 VOS3000 SIP No Timer Call Duration vs. Session Timer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcca Understanding the relationship between the VOS3000 SIP no timer call duration and the session timer is essential for proper configuration. These two mechanisms work as complementary systems:<\/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\">Aspect<\/th><th class=\"has-text-align-left\" data-align=\"left\">Session Timer (RFC 4028)<\/th><th class=\"has-text-align-left\" data-align=\"left\">No Timer Call Duration<\/th><\/tr><tr><td>\ud83d\udccc Parameter<\/td><td>SS_SIP_SESSION_TTL<\/td><td>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/td><\/tr><tr><td>\ud83d\udd22 Default<\/td><td>600s (10 min)<\/td><td>7200s (2 hours)<\/td><\/tr><tr><td>\ud83c\udfaf Applies When<\/td><td>Caller supports &#8220;timer&#8221;<\/td><td>Caller does NOT support &#8220;timer&#8221;<\/td><\/tr><tr><td>\ud83d\udce1 Detection Method<\/td><td>Active \u2014 sends re-INVITE\/UPDATE<\/td><td>Passive \u2014 hard timeout only<\/td><\/tr><tr><td>\ud83d\udd0d Session-Expires Header<\/td><td>Present in SIP messages<\/td><td>Not present<\/td><\/tr><tr><td>\ud83d\udcde Verification<\/td><td>Periodic refresh with 200 OK<\/td><td>None \u2014 just countdown<\/td><\/tr><tr><td>\u274c Call Termination<\/td><td>No 200 OK \u2192 BYE sent<\/td><td>Time exceeded \u2192 BYE sent<\/td><\/tr><tr><td>\ud83d\udee1\ufe0f Protection Level<\/td><td>High \u2014 active probing<\/td><td>Lower \u2014 passive timeout<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Key takeaway:<\/strong> The <a href=\"https:\/\/multahost.com\/blog\/vos3000-session-timer\/\">VOS3000 session timer<\/a> provides active call verification for timer-capable endpoints. The VOS3000 SIP no timer call duration provides passive protection for endpoints that lack timer support. Both are essential for a complete call management strategy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83c\udfaf-how-vos-3000-decides-which-mechanism-to-use\">\ud83c\udfaf How VOS3000 Decides Which Mechanism to Use<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udda5\ufe0f When a SIP INVITE arrives at VOS3000, the softswitch inspects the SIP headers to determine whether the caller supports session timers:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\ud83d\udcde SIP INVITE Arrives at VOS3000\n    \u2502\n    \u251c\u2500\u2500 VOS3000 checks for Session-Expires header\n    \u2502\n    \u251c\u2500\u2500 \u2705 Session-Expires header FOUND\n    \u2502   \u251c\u2500\u2500 Caller supports RFC 4028 session timer\n    \u2502   \u251c\u2500\u2500 VOS3000 uses SS_SIP_SESSION_TTL (default: 600s)\n    \u2502   \u251c\u2500\u2500 Active probing with re-INVITE\/UPDATE messages\n    \u2502   \u2514\u2500\u2500 Call verified every TTL\/Segment interval\n    \u2502\n    \u2514\u2500\u2500 \u274c Session-Expires header NOT FOUND\n        \u251c\u2500\u2500 Caller does NOT support session timer\n        \u251c\u2500\u2500 VOS3000 uses SS_SIP_NO_TIMER_REINVITE_INTERVAL (default: 7200s)\n        \u251c\u2500\u2500 NO active probing \u2014 passive countdown only\n        \u2514\u2500\u2500 Call forcibly terminated when time exceeds limit\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-ss-sip-no-timer-reinvite-interval-deep-dive\">\u2699\ufe0f SS_SIP_NO_TIMER_REINVITE_INTERVAL \u2014 Deep Dive<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd10 Let&#8217;s examine the VOS3000 SIP no timer call duration parameter in full detail \u2014 what it does, how it works, and what happens when the limit is reached.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd11-how-the-parameter-works\">\ud83d\udd11 How the Parameter Works<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f When a SIP caller that does <strong>not<\/strong> support session timers establishes a call through VOS3000:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcde The call is established normally (INVITE \u2192 200 OK \u2192 ACK)<\/li>\n\n\n\n<li>\ud83d\udda5\ufe0f VOS3000 detects the absence of a <strong>Session-Expires<\/strong> header<\/li>\n\n\n\n<li>\u23f0 VOS3000 starts a countdown timer set to <strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong> seconds<\/li>\n\n\n\n<li>\ud83d\udcca The call proceeds normally while the countdown runs<\/li>\n\n\n\n<li>\ud83d\udea8 When the countdown reaches zero, VOS3000 sends a <strong>BYE message<\/strong> to terminate the call<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f <strong>Important:<\/strong> Unlike session timers, VOS3000 does NOT send any re-INVITE or UPDATE messages during the call. The only action taken is the forced termination when the timer expires. This is a <strong>passive safety mechanism<\/strong> \u2014 it cannot detect whether the call is still alive before the timeout.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-duration-conversion-table\">\ud83d\udcca Duration Conversion Table<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb Common SS_SIP_NO_TIMER_REINVITE_INTERVAL values and their equivalent durations:<\/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\">Seconds<\/th><th class=\"has-text-align-left\" data-align=\"left\">Minutes<\/th><th class=\"has-text-align-left\" data-align=\"left\">Hours<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common Name<\/th><\/tr><tr><td>900<\/td><td>15<\/td><td>0.25<\/td><td>Quarter hour<\/td><\/tr><tr><td>1800<\/td><td>30<\/td><td>0.5<\/td><td>Half hour<\/td><\/tr><tr><td>3600<\/td><td>60<\/td><td>1<\/td><td>One hour<\/td><\/tr><tr><td>5400<\/td><td>90<\/td><td>1.5<\/td><td>Ninety minutes<\/td><\/tr><tr><td>7200<\/td><td>120<\/td><td>2<\/td><td>\u2705 Default (two hours)<\/td><\/tr><tr><td>10800<\/td><td>180<\/td><td>3<\/td><td>Three hours<\/td><\/tr><tr><td>14400<\/td><td>240<\/td><td>4<\/td><td>Four hours<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-preventing-runaway-calls-with-vos-3000-sip-no-timer-call-duration\">\ud83d\udee1\ufe0f Preventing Runaway Calls with VOS3000 SIP No Timer Call Duration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udea8 <strong>Runaway calls<\/strong> are one of the most costly problems in VoIP operations. They occur when a call remains in &#8220;connected&#8221; state long after both parties have stopped talking \u2014 typically because of network failures, endpoint crashes, or NAT timeouts that prevent proper BYE messages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u26a0\ufe0f-how-runaway-calls-happen\">\u26a0\ufe0f How Runaway Calls Happen<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde Here&#8217;s the scenario that creates runaway calls on non-timer endpoints:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\ud83d\udcde Call Established Between Non-Timer Endpoint and VOS3000\n    \u2502\n    \u251c\u2500\u2500 Both parties talk normally\n    \u2502\n    \u251c\u2500\u2500 \ud83d\udd34 Network failure \/ endpoint crash \/ NAT timeout\n    \u2502   \u251c\u2500\u2500 No BYE message sent (endpoint is dead\/unreachable)\n    \u2502   \u251c\u2500\u2500 Call remains in \"connected\" state on VOS3000\n    \u2502   \u2514\u2500\u2500 VOS3000 CANNOT send re-INVITE (endpoint has no timer support)\n    \u2502\n    \u251c\u2500\u2500 \u23f0 Without SS_SIP_NO_TIMER_REINVITE_INTERVAL:\n    \u2502   \u2514\u2500\u2500 \u274c Call stays connected INDEFINITELY\n    \u2502       \u2514\u2500\u2500 \ud83d\udcb8 Billing continues to accumulate\n    \u2502\n    \u2514\u2500\u2500 \u2705 With SS_SIP_NO_TIMER_REINVITE_INTERVAL = 7200s:\n        \u2514\u2500\u2500 After 2 hours, VOS3000 sends BYE\n            \u2514\u2500\u2500 \ud83d\udee1\ufe0f Call terminated, billing stops\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Critical point:<\/strong> Unlike timer-capable endpoints where VOS3000 can <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-session\/\">actively probe<\/a> the session, non-timer endpoints offer zero visibility into call health. The SS_SIP_NO_TIMER_REINVITE_INTERVAL is the <strong>only<\/strong> mechanism that prevents indefinite zombie calls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-runaway-call-cost-impact-table\">\ud83d\udcca Runaway Call Cost Impact Table<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcb8 Understanding the financial impact of runaway calls shows why the VOS3000 SIP no timer call duration setting matters:<\/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\">Zombie Call Duration<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rate ($\/min)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Cost per Incident<\/th><th class=\"has-text-align-left\" data-align=\"left\">10 Incidents\/Month<\/th><\/tr><tr><td>1 hour (no limit)<\/td><td>$0.02<\/td><td>$1.20<\/td><td>$12.00<\/td><\/tr><tr><td>4 hours (no limit)<\/td><td>$0.02<\/td><td>$4.80<\/td><td>$48.00<\/td><\/tr><tr><td>12 hours (no limit)<\/td><td>$0.02<\/td><td>$14.40<\/td><td>$144.00<\/td><\/tr><tr><td>24 hours (no limit)<\/td><td>$0.05<\/td><td>$72.00<\/td><td>$720.00<\/td><\/tr><tr><td>48 hours (no limit)<\/td><td>$0.10<\/td><td>$288.00<\/td><td>$2,880.00<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udea8 <strong>As you can see, without a hard call duration limit, a single zombie call on a premium route can cost hundreds of dollars.<\/strong> The VOS3000 SIP no timer call duration parameter ensures that even if the endpoint cannot be actively probed, the call will be terminated within a predictable timeframe.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-vos-3000-sip-no-timer-call-duration-and-billing-accuracy\">\ud83d\udcca VOS3000 SIP No Timer Call Duration and Billing Accuracy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcb0 Billing accuracy is directly affected by the VOS3000 SIP no timer call duration setting. Here&#8217;s how:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd10-billing-impact-analysis\">\ud83d\udd10 Billing Impact Analysis<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">NO_TIMER_INTERVAL<\/th><th class=\"has-text-align-left\" data-align=\"left\">Max Zombie Duration<\/th><th class=\"has-text-align-left\" data-align=\"left\">Billing Risk<\/th><th class=\"has-text-align-left\" data-align=\"left\">CDR Accuracy<\/th><\/tr><tr><td>900s (15 min)<\/td><td>15 minutes max<\/td><td>\ud83d\udee1\ufe0f Very Low<\/td><td>\u2705 Excellent<\/td><\/tr><tr><td>1800s (30 min)<\/td><td>30 minutes max<\/td><td>\u2705 Low<\/td><td>\u2705 Very Good<\/td><\/tr><tr><td>3600s (1 hour)<\/td><td>1 hour max<\/td><td>\ud83d\udd27 Medium-Low<\/td><td>\ud83d\udcca Good<\/td><\/tr><tr><td>7200s (2 hours) \u2705<\/td><td>2 hours max<\/td><td>\u26a0\ufe0f Medium<\/td><td>\ud83d\udcca Acceptable<\/td><\/tr><tr><td>14400s (4 hours)<\/td><td>4 hours max<\/td><td>\ud83d\udea8 High<\/td><td>\u274c Poor<\/td><\/tr><tr><td>Not configured<\/td><td>Unlimited<\/td><td>\ud83d\udd25 Critical<\/td><td>\u274c Very Poor<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcdd <strong>Billing accuracy depends on CDR records matching actual call durations.<\/strong> When zombie calls persist, CDRs show inflated durations that do not correspond to real conversations. This creates <a href=\"https:\/\/multahost.com\/blog\/vos3000-cdr-billing-discrepancy\/\">CDR billing discrepancies<\/a> that can erode customer trust and cause revenue disputes. For more on the overall billing framework, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">VOS3000 billing system guide<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd27-step-by-step-configuration-of-vos-3000-sip-no-timer-call-duration\">\ud83d\udd27 Step-by-Step Configuration of VOS3000 SIP No Timer Call Duration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udda5\ufe0f Follow these steps to configure SS_SIP_NO_TIMER_REINVITE_INTERVAL in your VOS3000 softswitch:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-navigate-to-sip-parameters-\ud83d\udccb\">Step 1: Navigate to SIP Parameters \ud83d\udccb<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udd10 Log in to VOS3000 Client with administrator credentials<\/li>\n\n\n\n<li>\ud83d\udccc Navigate: <strong>Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 SIP parameter<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Locate <strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong> in the SIP parameter list<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-choose-your-value-\u23f1\ufe0f\">Step 2: Choose Your Value \u23f1\ufe0f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf Select the appropriate value based on your deployment type:<\/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\">Deployment Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommended Value<\/th><th class=\"has-text-align-left\" data-align=\"left\">Duration<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rationale<\/th><\/tr><tr><td>\ud83c\udfe2 Standard enterprise<\/td><td>7200s<\/td><td>2 hours<\/td><td>\u2705 Default \u2014 sufficient for most calls<\/td><\/tr><tr><td>\ud83d\udcde Wholesale termination<\/td><td>3600s<\/td><td>1 hour<\/td><td>\ud83d\udd27 Tighter control, lower risk<\/td><\/tr><tr><td>\ud83d\udee1\ufe0f Premium \/ high-value routes<\/td><td>1800s<\/td><td>30 minutes<\/td><td>\ud83d\udd10 Maximum billing protection<\/td><\/tr><tr><td>\ud83c\udf10 Legacy gateway networks<\/td><td>1800s\u20133600s<\/td><td>30\u201360 min<\/td><td>\ud83d\udce1 Old devices often lack timer support<\/td><\/tr><tr><td>\ud83d\udcde Call center operations<\/td><td>5400s<\/td><td>90 minutes<\/td><td>\ud83d\udcca Accommodates long agent calls<\/td><\/tr><tr><td>\ud83d\udd25 Maximum protection<\/td><td>900s<\/td><td>15 minutes<\/td><td>\ud83d\udee1\ufe0f Zero tolerance for runaway calls<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-3-apply-and-save-\u2705\">Step 3: Apply and Save \u2705<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udcdd Enter the desired value (in seconds) in the <strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong> field<\/li>\n\n\n\n<li>\ud83d\udcbe Click <strong>Save<\/strong> to apply the configuration<\/li>\n\n\n\n<li>\ud83d\udd04 The new value takes effect for all subsequent calls from non-timer SIP endpoints<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f <strong>Note:<\/strong> Existing calls are not affected by the change. Only new calls established after the configuration update will use the new interval value.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd04-relationship-with-other-vos-3000-parameters\">\ud83d\udd04 Relationship with Other VOS3000 Parameters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd17 The VOS3000 SIP no timer call duration does not operate in isolation. It works alongside several related parameters that together form a comprehensive call management system:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Default<\/th><th class=\"has-text-align-left\" data-align=\"left\">Unit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Relationship to NO_TIMER<\/th><\/tr><tr><td>SS_SIP_SESSION_TTL<\/td><td>600<\/td><td>Seconds<\/td><td>\ud83d\udd04 Complementary \u2014 applies when timer IS supported<\/td><\/tr><tr><td>SS_SIP_SESSION_UPDATE_SEGMENT<\/td><td>2<\/td><td>Count<\/td><td>\ud83d\udcca Controls re-INVITE frequency for timer calls<\/td><\/tr><tr><td>SS_SIP_SESSION_TIMEOUT_EARLY_HANGUP<\/td><td>0<\/td><td>Seconds<\/td><td>\u23f0 Grace period \u2014 applies only to timer calls<\/td><\/tr><tr><td>SS_MAX_CALL_DURATION<\/td><td>None<\/td><td>\u2014<\/td><td>\ud83d\udee1\ufe0f System-level hard limit for ALL calls<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Key relationship:<\/strong> The <strong>SS_MAX_CALL_DURATION<\/strong> parameter (system parameter, not SIP parameter) enforces a hard maximum call duration for <em>all<\/em> calls regardless of whether they support timers or not. If both SS_SIP_NO_TIMER_REINVITE_INTERVAL and SS_MAX_CALL_DURATION are configured, the <strong>shorter of the two values takes effect<\/strong>. Read more about this in our <a href=\"https:\/\/multahost.com\/blog\/vos3000-max-call-duration\/\">VOS3000 max call duration guide<\/a> and <a href=\"https:\/\/multahost.com\/blog\/vos3000-system-parameters\/\">system parameters overview<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccb-parameter-interaction-flow\">\ud83d\udccb Parameter Interaction Flow<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">\ud83d\udcde Call Arrives at VOS3000\n    \u2502\n    \u251c\u2500\u2500 Check: Does SS_MAX_CALL_DURATION exist?\n    \u2502   \u251c\u2500\u2500 YES \u2192 Apply system-level hard limit\n    \u2502   \u2514\u2500\u2500 NO  \u2192 No system-level limit\n    \u2502\n    \u251c\u2500\u2500 Check: Does caller support \"timer\"?\n    \u2502   \u251c\u2500\u2500 YES \u2192 Apply SS_SIP_SESSION_TTL (600s default)\n    \u2502   \u2502        Active probing via re-INVITE\/UPDATE\n    \u2502   \u2502        Hang up if no 200 OK confirmation\n    \u2502   \u2502\n    \u2502   \u2514\u2500\u2500 NO  \u2192 Apply SS_SIP_NO_TIMER_REINVITE_INTERVAL (7200s default)\n    \u2502            NO active probing \u2014 passive countdown\n    \u2502            Hang up when time exceeded\n    \u2502\n    \u2514\u2500\u2500 \ud83d\udee1\ufe0f Effective limit = min(SS_MAX_CALL_DURATION, applicable timer)\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udca1-best-practices-for-vos-3000-sip-no-timer-call-duration\">\ud83d\udca1 Best Practices for VOS3000 SIP No Timer Call Duration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf Follow these best practices to maximize the effectiveness of your VOS3000 SIP no timer call duration configuration:<\/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>\ud83c\udfaf Set SS_MAX_CALL_DURATION<\/td><td>Configure a system-level limit as backup<\/td><td>\ud83d\udee1\ufe0f Double protection for all calls<\/td><\/tr><tr><td>\ud83d\udcca Monitor CDR records<\/td><td>Check for calls near the 7200s limit weekly<\/td><td>\ud83d\udd0d Detects non-timer endpoint patterns<\/td><\/tr><tr><td>\ud83d\udcde Encourage timer support<\/td><td>Ask vendors to enable RFC 4028 on endpoints<\/td><td>\u2705 Active probing is far superior<\/td><\/tr><tr><td>\ud83d\udd27 Lower for premium routes<\/td><td>Set 1800s\u20133600s for expensive destinations<\/td><td>\ud83d\udd10 Minimizes billing exposure<\/td><\/tr><tr><td>\ud83d\udd04 Coordinate with session timer<\/td><td>NO_TIMER should be \u2265 3\u00d7 SS_SIP_SESSION_TTL<\/td><td>\ud83d\udcca Consistent protection across both modes<\/td><\/tr><tr><td>\ud83d\udcdd Document configuration<\/td><td>Record all timer-related parameter values<\/td><td>\ud83d\udccb Simplifies troubleshooting later<\/td><\/tr><tr><td>\ud83d\udce1 Verify endpoint compatibility<\/td><td>Capture SIP INVITE to check Session-Expires<\/td><td>\ud83d\udd0d Confirms which mode is active<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Pro tip:<\/strong> If most of your SIP trunks support session timers, a higher VOS3000 SIP no timer call duration (7200s default) is acceptable since only a few calls will hit this limit. But if you have many legacy gateways without timer support, lower the value to 1800s\u20133600s for better protection. Check our <a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\">VOS3000 parameter description<\/a> guide for the complete parameter reference.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-problems-and-troubleshooting\">\ud83d\udee1\ufe0f Common Problems and Troubleshooting<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Here are the most common issues related to the VOS3000 SIP no timer call duration and their solutions:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-calls-being-cut-after-exactly-2-hours\">\u274c Problem 1: Calls Being Cut After Exactly 2 Hours<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> Legitimate long-duration calls are being terminated at exactly 2 hours.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The SIP caller does not support session timers, and SS_SIP_NO_TIMER_REINVITE_INTERVAL is set to the default 7200 seconds.<\/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 Increase SS_SIP_NO_TIMER_REINVITE_INTERVAL if 2-hour calls are expected<\/li>\n\n\n\n<li>\ud83d\udcde Ask the SIP endpoint vendor to implement RFC 4028 session timer support<\/li>\n\n\n\n<li>\ud83d\udd10 Verify the call flow using our <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-call-flow\/\">SIP call flow guide<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-ultra-long-bills-from-non-timer-endpoints\">\u274c Problem 2: Ultra-Long Bills from Non-Timer Endpoints<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> CDR records show calls lasting the full 7200 seconds, but the actual conversation was much shorter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The endpoint crashed or lost network connectivity without sending BYE, and the non-timer interval is too long.<\/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>\u23f1\ufe0f Reduce SS_SIP_NO_TIMER_REINVITE_INTERVAL to 1800s or 3600s<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f Set SS_MAX_CALL_DURATION as a secondary safety limit<\/li>\n\n\n\n<li>\ud83d\udcca Cross-reference CDR records with <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">billing system<\/a> data<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-not-sure-which-endpoints-support-session-timers\">\u274c Problem 3: Not Sure Which Endpoints Support Session Timers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> Unknown whether your SIP trunks and gateways support RFC 4028.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Solution:<\/strong> Capture the SIP INVITE message and check for the <strong>Session-Expires<\/strong> header:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"># SIP INVITE from a TIMER-capable endpoint:\nINVITE sip:destination@example.com SIP\/2.0\nVia: SIP\/2.0\/UDP 10.0.0.5:5060\nSession-Expires: 600           &lt;-- \u2705 Timer SUPPORTED\nMin-SE: 90\n...\n\n# SIP INVITE from a NON-TIMER endpoint:\nINVITE sip:destination@example.com SIP\/2.0\nVia: SIP\/2.0\/UDP 10.0.0.10:5060\n                                &lt;-- \u274c No Session-Expires header\n...\n# VOS3000 will use SS_SIP_NO_TIMER_REINVITE_INTERVAL for this call\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde Need more help with SIP debugging? See our <a href=\"https:\/\/multahost.com\/blog\/vos3000-troubleshooting-guide-2026\/\">VOS3000 troubleshooting guide<\/a> for detailed instructions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-complete-vos-3000-sip-no-timer-call-duration-decision-matrix\">\ud83d\udcca Complete VOS3000 SIP No Timer Call Duration Decision Matrix<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf Use this decision matrix to select the optimal SS_SIP_NO_TIMER_REINVITE_INTERVAL value for your deployment:<\/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\">Factor<\/th><th class=\"has-text-align-left\" data-align=\"left\">Low Value (900\u20131800s)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Mid Value (3600\u20135400s)<\/th><th class=\"has-text-align-left\" data-align=\"left\">High Value (7200s+)<\/th><\/tr><tr><td>\ud83d\udee1\ufe0f Billing risk<\/td><td>\u2705 Very low<\/td><td>\ud83d\udd27 Moderate<\/td><td>\u26a0\ufe0f Higher<\/td><\/tr><tr><td>\ud83d\udcde Call disruption<\/td><td>\u26a0\ufe0f Possible for long calls<\/td><td>\u2705 Rare<\/td><td>\u2705 Very rare<\/td><\/tr><tr><td>\ud83d\udcb8 Zombie call cost<\/td><td>\u2705 Minimal<\/td><td>\ud83d\udd27 Controlled<\/td><td>\u26a0\ufe0f Potentially high<\/td><\/tr><tr><td>\ud83d\udcca CDR accuracy<\/td><td>\u2705 Excellent<\/td><td>\ud83d\udcca Good<\/td><td>\ud83d\udd27 Acceptable<\/td><\/tr><tr><td>\ud83c\udfaf Best for<\/td><td>Premium routes, high rates<\/td><td>Wholesale, mixed traffic<\/td><td>Standard enterprise, low rates<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-default-vos-3000-sip-no-timer-call-duration\">\u2753 What is the default VOS3000 SIP no timer call duration?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f The default VOS3000 SIP no timer call duration is <strong>7200 seconds (2 hours)<\/strong>, configured via the <strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong> parameter. This means that when a SIP caller does not support the &#8220;timer&#8221; feature, VOS3000 will forcibly terminate the call after 7200 seconds of continuous conversation. This default is defined in the VOS3000 2.1.9.07 Official Manual (Table 4-3, Section 4.3.5.2).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-happens-when-vos-3000-sip-no-timer-call-duration-is-exceeded\">\u2753 What happens when VOS3000 SIP no timer call duration is exceeded?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udea8 When the call duration from a non-timer SIP endpoint exceeds the SS_SIP_NO_TIMER_REINVITE_INTERVAL value, VOS3000 <strong>sends a BYE message<\/strong> to terminate the call on both legs. The call is removed from the active call list, and a CDR record is generated with the total duration. This is a hard termination \u2014 there is no grace period or retry mechanism for non-timer calls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-is-vos-3000-sip-no-timer-call-duration-different-from-session-timer\">\u2753 How is VOS3000 SIP no timer call duration different from session timer?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd04 The key difference is the <strong>detection method<\/strong>. The <a href=\"https:\/\/multahost.com\/blog\/vos3000-session-timer\/\">VOS3000 session timer<\/a> (SS_SIP_SESSION_TTL, default 600s) <strong>actively probes<\/strong> timer-capable endpoints using re-INVITE\/UPDATE messages. The VOS3000 SIP no timer call duration (SS_SIP_NO_TIMER_REINVITE_INTERVAL, default 7200s) is a <strong>passive countdown<\/strong> \u2014 no probing occurs, and the call is simply terminated when the time limit is reached. Session timer is for endpoints that support RFC 4028; the no timer interval is for endpoints that do not.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-set-ss-sip-no-timer-reinvite-interval-to-unlimited\">\u2753 Can I set SS_SIP_NO_TIMER_REINVITE_INTERVAL to unlimited?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c While technically possible, setting the VOS3000 SIP no timer call duration to an extremely high value (or leaving it unconfigured) is <strong>strongly discouraged<\/strong>. Without a limit, zombie calls from non-timer endpoints can persist indefinitely, generating phantom billing charges. Always set a reasonable value based on your expected maximum call duration and risk tolerance. Also configure <a href=\"https:\/\/multahost.com\/blog\/vos3000-max-call-duration\/\">SS_MAX_CALL_DURATION<\/a> as a secondary safety mechanism.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-does-vos-3000-sip-no-timer-call-duration-affect-calls-that-support-session-timers\">\u2753 Does VOS3000 SIP no timer call duration affect calls that support session timers?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcf1 No. The SS_SIP_NO_TIMER_REINVITE_INTERVAL parameter <strong>only applies<\/strong> when the SIP caller does NOT support the &#8220;timer&#8221; feature. If the caller includes a Session-Expires header in the INVITE or 200 OK messages, VOS3000 uses the session timer mechanism (SS_SIP_SESSION_TTL) instead. The two mechanisms are mutually exclusive \u2014 each call uses one or the other based on the endpoint&#8217;s timer support.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-do-i-check-if-my-sip-endpoints-support-session-timers\">\u2753 How do I check if my SIP endpoints support session timers?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d Capture the SIP INVITE message using a network analyzer like Wireshark or the VOS3000 built-in SIP trace. Look for the <strong>Session-Expires<\/strong> header in the INVITE message. If the header is present, the endpoint supports RFC 4028 session timers and VOS3000 will use SS_SIP_SESSION_TTL. If the header is absent, the endpoint does not support timers and VOS3000 will use the VOS3000 SIP no timer call duration instead. See our <a href=\"https:\/\/multahost.com\/blog\/vos3000-troubleshooting-guide-2026\/\">troubleshooting guide<\/a> for detailed SIP trace instructions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-should-ss-sip-no-timer-reinvite-interval-be-higher-or-lower-than-ss-sip-session-ttl\">\u2753 Should SS_SIP_NO_TIMER_REINVITE_INTERVAL be higher or lower than SS_SIP_SESSION_TTL?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 It should be <strong>significantly higher<\/strong>. The default SS_SIP_SESSION_TTL is 600 seconds (10 minutes) \u2014 this is short because VOS3000 actively probes the call and can detect dead sessions quickly. The default SS_SIP_NO_TIMER_REINVITE_INTERVAL is 7200 seconds (2 hours) \u2014 this is much longer because VOS3000 cannot actively verify non-timer calls, so a longer limit avoids cutting legitimate long calls. A good rule of thumb is to set the no timer interval to at least <strong>3\u20136 times<\/strong> the session TTL value.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-expert-help-with-vos-3000-sip-no-timer-call-duration\">\ud83d\udcde Need Expert Help with VOS3000 SIP No Timer Call Duration?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 Configuring the VOS3000 SIP no timer call duration correctly is essential for preventing revenue loss from runaway calls and ensuring billing accuracy. Misconfiguration can lead to either premature call termination or expensive zombie calls.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcac <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a> \u2014 Get instant expert support for VOS3000 SIP no timer call duration configuration, session timer setup, and complete VoIP network optimization.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcda-related-resources\">\ud83d\udcda Related Resources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-session-timer\/\">VOS3000 Session Timer<\/a> \u2014 Active session timer configuration (RFC 4028)<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-max-call-duration\/\">VOS3000 Max Call Duration<\/a> \u2014 System-level hard call duration limits<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-call-flow\/\">VOS3000 SIP Call Flow<\/a> \u2014 Complete SIP signaling lifecycle<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\">VOS3000 Parameter Description<\/a> \u2014 Full parameter reference guide<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-system-parameters\/\">VOS3000 System Parameters<\/a> \u2014 System-level configuration including SS_MAX_CALL_DURATION<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">VOS3000 Billing System<\/a> \u2014 Complete billing configuration guide<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-cdr-billing-discrepancy\/\">VOS3000 CDR Billing Discrepancy<\/a> \u2014 Fix billing accuracy issues<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-session\/\">VOS3000 SIP Session<\/a> \u2014 SIP session management overview<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-routing\/\">VOS3000 Call Routing<\/a> \u2014 Call routing and termination configuration<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-termination\/\">VOS3000 Call Termination<\/a> \u2014 Call termination and hangup reasons<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-troubleshooting-guide-2026\/\">VOS3000 Troubleshooting Guide<\/a> \u2014 Diagnose and fix common issues<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/multahost.com\/blog\/vos3000-installation\/\">VOS3000 Installation<\/a> \u2014 Fresh installation guide<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noopener\">VOS3000 Official Downloads<\/a> \u2014 Official software and documentation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde Still have questions about the VOS3000 SIP no timer call duration? Reach out on WhatsApp at <strong>+8801911119966<\/strong> \u2014 we provide professional VOS3000 installation, configuration, and support services worldwide. \ud83c\udf10<\/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=\"540\" width=\"809\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-Retry-VOS3000-SIP-Early-Hangup-VOS3000-SIP-Session-Timer-Refresh-VOS3000-Non-Timer-Endpoint-Safety-VOS3000-SIP-NAT-Keepalive-3.png?resize=809%2C540\" alt=\"VOS3000 SIP Authentication Retry, VOS3000 SIP Early Hangup, VOS3000 SIP Session Timer Refresh, VOS3000 Non-Timer Endpoint Safety, VOS3000 SIP NAT Keepalive\" title=\"\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-Retry-VOS3000-SIP-Early-Hangup-VOS3000-SIP-Session-Timer-Refresh-VOS3000-Non-Timer-Endpoint-Safety-VOS3000-SIP-NAT-Keepalive-3.png?resize=809%2C540\" alt=\"VOS3000 SIP Authentication Retry, VOS3000 SIP Early Hangup, VOS3000 SIP Session Timer Refresh, VOS3000 Non-Timer Endpoint Safety, VOS3000 SIP NAT Keepalive\" title=\"\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-Retry-VOS3000-SIP-Early-Hangup-VOS3000-SIP-Session-Timer-Refresh-VOS3000-Non-Timer-Endpoint-Safety-VOS3000-SIP-NAT-Keepalive-3.png?resize=809%2C540\" alt=\"VOS3000 SIP Authentication Retry, VOS3000 SIP Early Hangup, VOS3000 SIP Session Timer Refresh, VOS3000 Non-Timer Endpoint Safety, VOS3000 SIP NAT Keepalive\" title=\"\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 SIP no timer call duration limit. Configure SS_SIP_NO_TIMER_REINVITE_INTERVAL to prevent runaway calls, protect billing accuracy, and stop zombie sessions.<\/p>\n","protected":false},"author":1,"featured_media":3117,"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":[684,2,685,795,686,689,690],"tags":[8317,8323,8326,8313,8338,8321,8335,8339,8331,8319,8333,8328,8340,8315,8310,8329,8337,8263,8266,8324,8314,8325,8236,7321,3981,8334,7884,7833,3816,8330,7882,8318,8309,8332,8254,8308,8262,8311,8336,8307,8322,8316,6256,6500,4812,8320,8327,909,8312],"class_list":["post-3122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000-sip","category-vos3000","category-vos3000-sip-accounts","category-vos3000-sip-message-settings","category-vos3000-sip-trunking","category-vos3000-support","category-vos3000-switch","tag-non-rfc-4028-endpoint","tag-non-session-timer-sip-device","tag-non-timer-sip-call-control","tag-non-timer-sip-caller-limit","tag-sip-bye-enforcement","tag-sip-call-duration-cap","tag-sip-call-duration-enforcement","tag-sip-call-limit-configuration","tag-sip-call-without-timer","tag-sip-caller-no-timer-support","tag-sip-caller-timer-support","tag-sip-endpoint-compatibility","tag-sip-endpoint-timer-detection","tag-sip-no-session-expires","tag-sip-no-timer-endpoint","tag-sip-no-timer-reinvite","tag-sip-non-timer-fallback","tag-sip-parameter-tuning","tag-sip-protocol-parameters","tag-sip-reinvite-interval","tag-sip-session-timer-fallback","tag-sip-timer-not-supported","tag-ss_sip_no_timer_reinvite_interval","tag-vos3000-additional-settings","tag-vos3000-billing-accuracy","tag-vos3000-billing-protection","tag-vos3000-call-cleanup","tag-vos3000-call-duration-limit","tag-vos3000-call-termination","tag-vos3000-cdr-accuracy","tag-vos3000-ghost-call-prevention","tag-vos3000-hard-call-timeout","tag-vos3000-maximum-call-duration-non-timer","tag-vos3000-maximum-conversation-time","tag-vos3000-network-reliability","tag-vos3000-no-timer-reinvite-interval","tag-vos3000-operation-management","tag-vos3000-runaway-call-prevention","tag-vos3000-session-timer-relationship","tag-vos3000-sip-no-timer-call-duration","tag-vos3000-sip-parameter-configuration","tag-vos3000-softswitch-call-limit","tag-vos3000-softswitch-management","tag-vos3000-softswitch-parameter","tag-vos3000-troubleshooting-guide","tag-vos3000-ultra-long-bill-prevention","tag-vos3000-voip-call-duration","tag-vos3000-voip-softswitch","tag-vos3000-zombie-call-protection"],"acf":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-SIP-Authentication-Retry-VOS3000-SIP-Early-Hangup-VOS3000-SIP-Session-Timer-Refresh-VOS3000-Non-Timer-Endpoint-Safety-VOS3000-SIP-NAT-Keepalive-2.png?fit=1536%2C1024&ssl=1?v=1776647888","jetpack-related-posts":[{"id":3121,"url":"https:\/\/multahost.com\/blog\/vos3000-sip-session-timer-guide\/","url_meta":{"origin":3122,"position":0},"title":"VOS3000 SIP Session Timer: Powerful RFC 4028 Setup Guide","author":"king","date":"April 20, 2026","format":false,"excerpt":"VOS3000 SIP Session Timer: Powerful RFC 4028 Setup Guide \ud83d\udcde Are mysterious ghost calls and ultra-long bills draining your VoIP revenue? The VOS3000 SIP session timer is your first line of defense. 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