{"id":1548,"date":"2026-04-30T04:46:42","date_gmt":"2026-04-30T04:46:42","guid":{"rendered":"https:\/\/www.vos3000.com\/blog\/?p=1548"},"modified":"2026-04-30T04:46:52","modified_gmt":"2026-04-30T04:46:52","slug":"vos3000-ivr-callback-timing","status":"publish","type":"post","link":"https:\/\/www.vos3000.com\/blog\/vos3000-ivr-callback-timing\/","title":{"rendered":"VOS3000 IVR Callback Timing Important KEEP_LINE_RING_TIME Configuration"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-ivr-callback-timing-essential-keep-line-ring-time-configuration\">VOS3000 IVR Callback Timing: Essential KEEP_LINE_RING_TIME Configuration<\/h1>\n\n\n\n<p>\u23f1\ufe0f How long should your VOS3000 IVR system ring a callback destination before giving up? And how long should it keep the callback line open while waiting for the call to connect? These two critical timing parameters \u2014 <strong>IVR_CALLBACK_KEEP_LINE_RING_TIME<\/strong> and <strong>IVR_CALLBACK_KEEP_LINE_TIME<\/strong> \u2014 control the <strong>VOS3000 IVR callback timing<\/strong> that directly impacts callback success rates, resource utilization, and caller experience. \ud83c\udfaf<\/p>\n\n\n\n<p>\ud83d\udccb According to the official VOS3000 V2.1.9.07 Manual, Section 4.3.5.3 (Audio Service Parameter), these two parameters govern IVR callback behavior: <strong>IVR_CALLBACK_KEEP_LINE_RING_TIME<\/strong> has a default of 5 seconds with a range of 0-120, described as &#8220;Alerting time for callback caller reservation.&#8221; <strong>IVR_CALLBACK_KEEP_LINE_TIME<\/strong> has a default of 30 seconds, described as &#8220;Used for callback line keep&#8221; with a reference to &#8220;See IVR_CALLBACK_KEEP_LINE_RING_TIME.&#8221; \ud83d\udd04<\/p>\n\n\n\n<p>\ud83d\udd27 All data in this guide is sourced exclusively from the official VOS3000 V2.1.9.07 Manual, Section 4.3.5.3 \u2014 no fabricated values, no guesswork. For expert assistance with your VOS3000 deployment, contact us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udca1<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#vos-3000-ivr-callback-timing-essential-keep-line-ring-time-configuration\">VOS3000 IVR Callback Timing: Essential KEEP_LINE_RING_TIME Configuration<\/a><ul><li><a href=\"#\u23f1\ufe0f-what-is-vos-3000-ivr-callback-timing\">\u23f1\ufe0f What Is VOS3000 IVR Callback Timing?<\/a><ul><li><a href=\"#\ud83c\udfaf-why-vos-3000-ivr-callback-timing-matters\">\ud83c\udfaf Why VOS3000 IVR Callback Timing Matters<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-ivr-callback-keep-line-ring-time-alerting-time\">\u2699\ufe0f IVR_CALLBACK_KEEP_LINE_RING_TIME \u2014 Alerting Time (VOS3000 IVR Callback)<\/a><\/li><li><a href=\"#\ud83d\udccb-ivr-callback-keep-line-time-line-keep-duration\">\ud83d\udccb IVR_CALLBACK_KEEP_LINE_TIME \u2014 Line Keep Duration (VOS3000 IVR Callback)<\/a><\/li><li><a href=\"#\ud83d\udcca-callback-timing-deployment-scenarios\">\ud83d\udcca VOS3000 IVR Callback Timing \u2014 Deployment Scenarios<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-callback-timing-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 IVR Callback Timing Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-callbacks-always-fail-no-one-answers\">\u274c Problem 1: Callbacks Always Fail \u2014 No One Answers<\/a><\/li><li><a href=\"#\u274c-problem-2-callback-lines-exhausted-cannot-process-new-callbacks\">\u274c Problem 2: Callback Lines Exhausted \u2014 Cannot Process New Callbacks<\/a><\/li><li><a href=\"#\u274c-problem-3-callback-connects-but-drops-immediately\">\u274c Problem 3: Callback Connects But Drops Immediately<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-vos-3000-ivr-callback-timing-configuration-checklist\">\ud83d\udcca VOS3000 IVR Callback Timing Configuration Checklist<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-vos-3000-ivr-callback-timing\">\u2753 What is VOS3000 IVR callback timing?<\/a><\/li><li><a href=\"#\u2753-what-is-the-default-ivr-callback-keep-line-ring-time\">\u2753 What is the default IVR_CALLBACK_KEEP_LINE_RING_TIME?<\/a><\/li><li><a href=\"#\u2753-what-is-the-difference-between-ring-time-and-keep-line-time\">\u2753 What is the difference between RING_TIME and KEEP_LINE_TIME?<\/a><\/li><li><a href=\"#\u2753-why-is-the-default-ring-time-only-5-seconds\">\u2753 Why is the default RING_TIME only 5 seconds?<\/a><\/li><li><a href=\"#\u2753-how-do-i-configure-ivr-callback-timing-in-vos-3000\">\u2753 How do I configure IVR callback timing in VOS3000?<\/a><\/li><li><a href=\"#\u2753-what-happens-if-keep-line-time-is-less-than-ring-time\">\u2753 What happens if KEEP_LINE_TIME is less than RING_TIME?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u23f1\ufe0f-what-is-vos-3000-ivr-callback-timing\">\u23f1\ufe0f What Is VOS3000 IVR Callback Timing?<\/h2>\n\n\n\n<p>\ud83d\udd04 The <strong>VOS3000 IVR callback timing<\/strong> parameters control the duration and behavior of IVR callback operations. In a callback scenario, the IVR system calls a user back (rather than the user calling in). The two timing parameters determine: (1) how long the system rings the callback destination before hanging up, and (2) how long the system keeps the callback line open for the connection to be established. \ud83d\udccb<\/p>\n\n\n\n<p>\ud83d\udccc According to the official VOS3000 V2.1.9.07 Manual, Section 4.3.5.3:<\/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\">Range<\/th><th class=\"has-text-align-left\" data-align=\"left\">Description<\/th><\/tr><tr><td><strong>IVR_CALLBACK_KEEP_LINE_RING_TIME<\/strong><\/td><td><strong>5<\/strong><\/td><td><strong>0\u2013120<\/strong><\/td><td>Alerting time for callback caller reservation<\/td><\/tr><tr><td><strong>IVR_CALLBACK_KEEP_LINE_TIME<\/strong><\/td><td><strong>30<\/strong><\/td><td>\u2014<\/td><td>Used for callback line keep. See IVR_CALLBACK_KEEP_LINE_RING_TIME<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>Key insight:<\/strong> The IVR_CALLBACK_KEEP_LINE_RING_TIME parameter controls the &#8220;alerting time&#8221; \u2014 the duration the system rings the callback destination. The range is 0 to 120 seconds, with a default of only 5 seconds. This is a very short default \u2014 many deployments will need to increase this value to give the called party enough time to answer. The IVR_CALLBACK_KEEP_LINE_TIME (default 30 seconds) controls the total line keep duration, which includes the alerting time plus any additional time needed for the callback connection to be fully established. \ud83d\udd12<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83c\udfaf-why-vos-3000-ivr-callback-timing-matters\">\ud83c\udfaf Why VOS3000 IVR Callback Timing Matters<\/h3>\n\n\n\n<p>\u26a0\ufe0f Improperly configured callback timing causes several operational problems:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcde <strong>Missed callbacks:<\/strong> If the ring time is too short (e.g., default 5 seconds), the called party may not have enough time to answer \u2014 especially if the phone is across the room or in another room<\/li>\n\n\n\n<li>\ud83d\udcca <strong>Resource waste:<\/strong> If the line keep time is too long, callback lines remain occupied unnecessarily, reducing the total number of concurrent callbacks the IVR can handle<\/li>\n\n\n\n<li>\ud83d\udd04 <strong>Poor callback success rate:<\/strong> The balance between ring time and line keep time directly impacts the percentage of callbacks that result in successful connections<\/li>\n\n\n\n<li>\ud83d\udcb0 <strong>Cost implications:<\/strong> Each second of line keep time consumes system resources and may incur carrier charges \u2014 excessive durations increase operational costs<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f <strong>Caller experience:<\/strong> If the callback line drops before the connection is established, the caller receives a failed callback and must retry \u2014 degrading the service experience<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-ivr-callback-keep-line-ring-time-alerting-time\">\u2699\ufe0f IVR_CALLBACK_KEEP_LINE_RING_TIME \u2014 Alerting Time (VOS3000 IVR Callback)<\/h2>\n\n\n\n<p>\ud83d\udd14 The <strong>IVR_CALLBACK_KEEP_LINE_RING_TIME<\/strong> parameter controls how long the VOS3000 IVR rings the callback destination. According to the manual, this is the &#8220;Alerting time for callback caller reservation&#8221; with a range of 0 to 120 seconds and a default of 5 seconds. \ud83d\udce1<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u23f1\ufe0f IVR_CALLBACK_KEEP_LINE_RING_TIME \u2014 Ring Duration:\n\nDefault: 5 seconds\nRange: 0\u2013120 seconds\nDescription: Alerting time for callback caller reservation\n\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  RING_TIME = 5 (default) \u2014 Very Short                             \u2502\n\u2502  IVR \u2500\u2500ring\u2500\u2500\u25ba Destination Phone                                   \u2502\n\u2502       |=====|  5 seconds of ringing                                 \u2502\n\u2502       \u2514\u2500\u2500 If not answered in 5s \u2192 Hang up                         \u2502\n\u2502       \u26a0\ufe0f Risk: Most people cannot answer in 5 seconds             \u2502\n\u2502                                                                     \u2502\n\u2502  RING_TIME = 30 (recommended for most deployments)                 \u2502\n\u2502  IVR \u2500\u2500ring\u2500\u2500\u25ba Destination Phone                                   \u2502\n\u2502       |==============================|  30 seconds of ringing       \u2502\n\u2502       \u2514\u2500\u2500 If not answered in 30s \u2192 Hang up                        \u2502\n\u2502       \u2705 Better: Reasonable time to locate and answer phone        \u2502\n\u2502                                                                     \u2502\n\u2502  RING_TIME = 60 (for slow-answer scenarios)                        \u2502\n\u2502  IVR \u2500\u2500ring\u2500\u2500\u25ba Destination Phone                                   \u2502\n\u2502       |====================================================|  60s    \u2502\n\u2502       \u2514\u2500\u2500 If not answered in 60s \u2192 Hang up                        \u2502\n\u2502       \ud83d\udcde Extended: For mobile phones or multiple ring cycles        \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/pre>\n\n\n\n<p>\ud83d\udcca <strong>Recommendation:<\/strong> The default 5 seconds is extremely short and likely insufficient for most real-world callback scenarios. Consider increasing to 20-30 seconds for standard deployments, or up to 60 seconds for mobile callback destinations where users may need more time to answer. The maximum supported value is 120 seconds. For help tuning callback timing, reach us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udcf1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-ivr-callback-keep-line-time-line-keep-duration\">\ud83d\udccb IVR_CALLBACK_KEEP_LINE_TIME \u2014 Line Keep Duration (VOS3000 IVR Callback)<\/h2>\n\n\n\n<p>\ud83d\udd17 The <strong>IVR_CALLBACK_KEEP_LINE_TIME<\/strong> parameter controls the total duration the IVR keeps the callback line open. According to the manual, it is &#8220;used for callback line keep&#8221; with a default of 30 seconds, and references IVR_CALLBACK_KEEP_LINE_RING_TIME for related configuration. \ud83d\udee0\ufe0f<\/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<\/td><td>IVR_CALLBACK_KEEP_LINE_TIME<\/td><\/tr><tr><td>\ud83d\udd22 Default<\/td><td>30 seconds<\/td><\/tr><tr><td>\ud83d\udcdd Description<\/td><td>Used for callback line keep<\/td><\/tr><tr><td>\ud83d\udd17 Related<\/td><td>See IVR_CALLBACK_KEEP_LINE_RING_TIME<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>Relationship between the two parameters:<\/strong> The RING_TIME controls the alerting\/ringing phase, while the KEEP_LINE_TIME controls the total line reservation duration. The KEEP_LINE_TIME should always be greater than or equal to the RING_TIME \u2014 otherwise, the line would be released before the ringing phase completes. The manual&#8217;s cross-reference (&#8220;See IVR_CALLBACK_KEEP_LINE_RING_TIME&#8221;) confirms these parameters are designed to work together. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-callback-timing-deployment-scenarios\">\ud83d\udcca VOS3000 IVR Callback Timing \u2014 Deployment Scenarios<\/h2>\n\n\n\n<p>\ud83c\udfe2 Different callback scenarios require different timing configurations. Here are recommended settings based on the VOS3000 manual specifications and common deployment patterns: \ud83d\udca1<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Scenario<\/th><th class=\"has-text-align-left\" data-align=\"left\">RING_TIME<\/th><th class=\"has-text-align-left\" data-align=\"left\">KEEP_LINE_TIME<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rationale<\/th><\/tr><tr><td>\ud83d\udcde Desk phone callback<\/td><td>20s<\/td><td>30s<\/td><td>Desk phones are nearby; quick answer expected<\/td><\/tr><tr><td>\ud83d\udcf1 Mobile phone callback<\/td><td>30-45s<\/td><td>60s<\/td><td>Mobile users may need more time; network latency adds delay<\/td><\/tr><tr><td>\ud83c\udfe2 International callback<\/td><td>45-60s<\/td><td>90s<\/td><td>Longer network delays; multiple carrier hops increase latency<\/td><\/tr><tr><td>\ud83d\udcde Calling card callback<\/td><td>30s<\/td><td>60s<\/td><td>Balanced for calling card users on various phone types<\/td><\/tr><tr><td>\ud83d\udce1 High-volume callback center<\/td><td>15-20s<\/td><td>25s<\/td><td>Shorter times free lines faster; higher throughput<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83c\udfaf <strong>Tuning strategy:<\/strong> Start with conservative (longer) timing values and monitor callback success rates. Then gradually reduce the times to optimize resource utilization while maintaining acceptable success rates. For more on IVR parameters, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\" target=\"_blank\" rel=\"noopener\">VOS3000 parameter description<\/a> guide. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-callback-timing-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 IVR Callback Timing Problems and Solutions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-callbacks-always-fail-no-one-answers\">\u274c Problem 1: Callbacks Always Fail \u2014 No One Answers<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> IVR callback attempts consistently fail \u2014 the system rings the destination but the call is never answered, resulting in dropped callbacks.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The IVR_CALLBACK_KEEP_LINE_RING_TIME is set too low (possibly still at the default 5 seconds). The called party does not have enough time to reach the phone and answer before the system hangs up.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u23f1\ufe0f Increase IVR_CALLBACK_KEEP_LINE_RING_TIME to 20-30 seconds for desk phones, or 30-45 seconds for mobile phones<\/li>\n\n\n\n<li>\ud83d\udccb Also increase IVR_CALLBACK_KEEP_LINE_TIME to be at least 1.5x the RING_TIME<\/li>\n\n\n\n<li>\ud83d\udcca Monitor callback success rates after the change to confirm improvement<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-callback-lines-exhausted-cannot-process-new-callbacks\">\u274c Problem 2: Callback Lines Exhausted \u2014 Cannot Process New Callbacks<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> The IVR system runs out of available callback lines \u2014 new callback requests are queued or rejected because all lines are occupied with ongoing callbacks.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> IVR_CALLBACK_KEEP_LINE_TIME is set too high, causing each callback to occupy a line for an extended period even after the call should have been connected or dropped.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u23f1\ufe0f Reduce IVR_CALLBACK_KEEP_LINE_TIME to free lines faster<\/li>\n\n\n\n<li>\ud83d\udcca Analyze average callback connection time to set an appropriate KEEP_LINE_TIME<\/li>\n\n\n\n<li>\ud83d\udcde Consider increasing the IVR line capacity if callback volume is genuinely high<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-callback-connects-but-drops-immediately\">\u274c Problem 3: Callback Connects But Drops Immediately<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> The callback destination answers the call, but the connection drops almost immediately \u2014 the call lasts only a few seconds before being cut off.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The KEEP_LINE_TIME may have expired just as the connection was being established, or there is insufficient time remaining after the alerting phase for the call to be fully connected.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udccb Increase IVR_CALLBACK_KEEP_LINE_TIME to provide more margin after the alerting phase<\/li>\n\n\n\n<li>\ud83d\udd0d Ensure KEEP_LINE_TIME is significantly larger than RING_TIME<\/li>\n\n\n\n<li>\ud83d\udcde Check for media negotiation issues that may delay connection establishment<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-vos-3000-ivr-callback-timing-configuration-checklist\">\ud83d\udcca VOS3000 IVR Callback Timing Configuration Checklist<\/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\">Check<\/th><th class=\"has-text-align-left\" data-align=\"left\">Action<\/th><th class=\"has-text-align-left\" data-align=\"left\">Status<\/th><\/tr><tr><td>\ud83d\udccc 1<\/td><td>Set IVR_CALLBACK_KEEP_LINE_RING_TIME based on callback destination type (desk phone, mobile, international)<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 2<\/td><td>Set IVR_CALLBACK_KEEP_LINE_TIME to at least 1.5x the RING_TIME value<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 3<\/td><td>Test callback with a real phone \u2014 verify it rings long enough to answer<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 4<\/td><td>Monitor callback success rate and adjust timing as needed<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 5<\/td><td>Verify line resource utilization \u2014 ensure callback lines are not being held too long<\/td><td>\u2610<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udcde For expert guidance on VOS3000 IVR callback timing configuration, reach us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udca1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-vos-3000-ivr-callback-timing\">\u2753 What is VOS3000 IVR callback timing?<\/h3>\n\n\n\n<p>\u23f1\ufe0f <strong>VOS3000 IVR callback timing<\/strong> refers to two parameters that control the duration and behavior of IVR callback operations. According to the VOS3000 V2.1.9.07 Manual (Section 4.3.5.3), these are: <strong>IVR_CALLBACK_KEEP_LINE_RING_TIME<\/strong> (default: 5 seconds, range: 0\u2013120 seconds) \u2014 the &#8220;Alerting time for callback caller reservation,&#8221; controlling how long the system rings the callback destination; and <strong>IVR_CALLBACK_KEEP_LINE_TIME<\/strong> (default: 30 seconds) \u2014 &#8220;Used for callback line keep,&#8221; controlling the total duration the callback line remains open. \ud83d\udccb<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-default-ivr-callback-keep-line-ring-time\">\u2753 What is the default IVR_CALLBACK_KEEP_LINE_RING_TIME?<\/h3>\n\n\n\n<p>\ud83d\udd14 The default <strong>IVR_CALLBACK_KEEP_LINE_RING_TIME<\/strong> is <strong>5 seconds<\/strong> according to the VOS3000 V2.1.9.07 Manual (Section 4.3.5.3). This is the &#8220;Alerting time for callback caller reservation&#8221; \u2014 meaning the IVR system will ring the callback destination for only 5 seconds before giving up. For most real-world deployments, this default is too short \u2014 users typically need 20-30 seconds to locate and answer their phone. The configurable range is 0 to 120 seconds. \ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-difference-between-ring-time-and-keep-line-time\">\u2753 What is the difference between RING_TIME and KEEP_LINE_TIME?<\/h3>\n\n\n\n<p>\ud83d\udd04 IVR_CALLBACK_KEEP_LINE_RING_TIME controls the <em>alerting\/ringing<\/em> phase \u2014 how long the system rings the callback destination before hanging up. IVR_CALLBACK_KEEP_LINE_TIME controls the <em>total line reservation<\/em> \u2014 the overall duration the callback line is kept open, including the alerting phase plus any additional time for connection establishment. The KEEP_LINE_TIME should always be greater than or equal to the RING_TIME. The manual cross-references these parameters: &#8220;See IVR_CALLBACK_KEEP_LINE_RING_TIME&#8221; in the KEEP_LINE_TIME description. \ud83d\udca1<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-why-is-the-default-ring-time-only-5-seconds\">\u2753 Why is the default RING_TIME only 5 seconds?<\/h3>\n\n\n\n<p>\u23f1\ufe0f The 5-second default for IVR_CALLBACK_KEEP_LINE_RING_TIME is likely set conservatively to minimize resource usage in high-volume callback scenarios. However, 5 seconds is insufficient for most practical deployments \u2014 a person typically needs 15-30 seconds to hear the phone, locate it, and answer. The manual provides a range of 0\u2013120 seconds precisely so administrators can tune this value for their specific callback scenario. Increase it to match your users&#8217; typical answer time. \ud83d\udcde<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-do-i-configure-ivr-callback-timing-in-vos-3000\">\u2753 How do I configure IVR callback timing in VOS3000?<\/h3>\n\n\n\n<p>\u2699\ufe0f To configure IVR callback timing: (1) Log in to VOS3000 Client, (2) Navigate to Operation management \u2192 Softswitch management \u2192 Additional settings \u2192 Audio service parameter (Section 4.3.5.3), (3) Locate IVR_CALLBACK_KEEP_LINE_RING_TIME and set the desired alerting duration (0\u2013120 seconds), (4) Locate IVR_CALLBACK_KEEP_LINE_TIME and set the total line keep duration, (5) Save and apply the changes. The RING_TIME determines how long the system rings; the KEEP_LINE_TIME determines how long the line stays reserved. For more on <a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\" target=\"_blank\" rel=\"noopener\">system parameters<\/a>, see our configuration guide. \ud83d\udcd6<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-happens-if-keep-line-time-is-less-than-ring-time\">\u2753 What happens if KEEP_LINE_TIME is less than RING_TIME?<\/h3>\n\n\n\n<p>\u26a0\ufe0f If IVR_CALLBACK_KEEP_LINE_TIME is set to a value smaller than IVR_CALLBACK_KEEP_LINE_RING_TIME, the callback line would be released before the alerting\/ringing phase completes. This would cause the callback to be cut off mid-ring \u2014 the system would start ringing the destination but then immediately drop the line because the keep time expired. Always ensure KEEP_LINE_TIME is greater than or equal to RING_TIME. A good practice is to set KEEP_LINE_TIME to at least 1.5x the RING_TIME value to provide sufficient margin for connection establishment after the call is answered. \ud83d\udee1\ufe0f<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/h2>\n\n\n\n<p>For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/p>\n\n\n\n<p>\ud83d\udcf1 <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a><br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.vos3000.com\">www.vos3000.com<\/a><br>\ud83c\udf10 <strong>Blog:<\/strong> <a href=\"https:\/\/multahost.com\/blog\" target=\"_blank\" rel=\"noopener\">multahost.com\/blog<\/a><br>\ud83d\udce5 <strong>Downloads:<\/strong> <a href=\"https:\/\/www.vos3000.com\/downloads.php\">VOS3000 Downloads<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone-VOS3000-IVR-DTMF-Parse-Mode-VOS3000-IVR-Voicemail-System-2-1024x1024.png\" alt=\"VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation\"><\/td><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone-VOS3000-IVR-DTMF-Parse-Mode-VOS3000-IVR-Voicemail-System-2-1024x1024.png\" alt=\"VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation\"><\/td><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone-VOS3000-IVR-DTMF-Parse-Mode-VOS3000-IVR-Voicemail-System-2-1024x1024.png\" alt=\"VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 IVR callback timing with KEEP_LINE_RING_TIME and KEEP_LINE_TIME. Configure alerting time 0-120s and line keep duration for callback success rates.<\/p>\n","protected":false},"author":1,"featured_media":1531,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kadence_starter_templates_imported_post":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[10505,10494,10477,10502,10478,10503,10473,10489,10465,10499,10467,10498,10476,10475,10496,10501,10500,10492,10472,10469,10482,10487,10497,10480,10471,10491,10506,10463,10484,10483,10485,10474,10490,10493,10486,10488,10479,10504,10495,10464,10470,10468,10466,10481],"class_list":["post-1548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000-softswitch","tag-vos3000-callback-line-management","tag-vos3000-callback-ring-duration","tag-vos3000-callback-success-rate","tag-vos3000-callback-tuning","tag-vos3000-ivr-audio-service-parameter","tag-vos3000-ivr-call-back-timing","tag-vos3000-ivr-callback-0-120-seconds","tag-vos3000-ivr-callback-alerting","tag-vos3000-ivr-callback-alerting-time","tag-vos3000-ivr-callback-best-practices","tag-vos3000-ivr-callback-configuration","tag-vos3000-ivr-callback-configuration-steps","tag-vos3000-ivr-callback-default-30-seconds","tag-vos3000-ivr-callback-default-5-seconds","tag-vos3000-ivr-callback-default-values","tag-vos3000-ivr-callback-deployment","tag-vos3000-ivr-callback-faq","tag-vos3000-ivr-callback-guide","tag-vos3000-ivr-callback-keep-duration","tag-vos3000-ivr-callback-line-keep","tag-vos3000-ivr-callback-manual-reference","tag-vos3000-ivr-callback-parameter","tag-vos3000-ivr-callback-range","tag-vos3000-ivr-callback-resource-management","tag-vos3000-ivr-callback-ring-time","tag-vos3000-ivr-callback-seconds","tag-vos3000-ivr-callback-seconds-configuration","tag-vos3000-ivr-callback-timing","tag-vos3000-ivr-callback-timing-setup","tag-vos3000-ivr-callback-troubleshooting","tag-vos3000-ivr-callback-v2-1-9-07","tag-vos3000-ivr-caller-reservation","tag-vos3000-ivr-line-hold-time","tag-vos3000-ivr-line-reservation","tag-vos3000-ivr-ring-timeout","tag-vos3000-ivr-section-4-3-5-3","tag-vos3000-ivr-timing-configuration","tag-vos3000-ivr-timing-parameters","tag-vos3000-ivr-voip-callback","tag-vos3000-ivr_callback_keep_line_ring_time","tag-vos3000-ivr_callback_keep_line_time","tag-vos3000-keep_line_ring_time","tag-vos3000-keep_line_time","tag-vos3000-softswitch-ivr-callback"],"acf":[],"jetpack_featured_media_url":"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Call-Forwarding-Types-VOS3000-Do-Not-Disturb-Mode-VOS3000-Display-Caller-ID-Forwarding-VOS3000-Monthly-Consumption-Limits.png","blog_post_layout_featured_media_urls":{"thumbnail":["https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Call-Forwarding-Types-VOS3000-Do-Not-Disturb-Mode-VOS3000-Display-Caller-ID-Forwarding-VOS3000-Monthly-Consumption-Limits-150x150.png",150,150,true],"full":["https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-Call-Forwarding-Types-VOS3000-Do-Not-Disturb-Mode-VOS3000-Display-Caller-ID-Forwarding-VOS3000-Monthly-Consumption-Limits.png",1536,1024,false]},"categories_names":{"1":{"name":"VOS3000 Softswitch","link":"https:\/\/www.vos3000.com\/blog\/category\/vos3000-softswitch\/"}},"tags_names":{"10505":{"name":"VOS3000 callback line management","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-callback-line-management\/"},"10494":{"name":"VOS3000 callback ring duration","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-callback-ring-duration\/"},"10477":{"name":"VOS3000 callback success rate","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-callback-success-rate\/"},"10502":{"name":"VOS3000 callback tuning","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-callback-tuning\/"},"10478":{"name":"VOS3000 IVR audio service parameter","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-ivr-audio-service-parameter\/"},"10503":{"name":"VOS3000 IVR call back timing","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-ivr-call-back-timing\/"},"10473":{"name":"VOS3000 IVR callback 0-120 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