{"id":1452,"date":"2026-04-27T20:18:30","date_gmt":"2026-04-27T20:18:30","guid":{"rendered":"https:\/\/www.vos3000.com\/blog\/?p=1452"},"modified":"2026-04-27T20:18:40","modified_gmt":"2026-04-27T20:18:40","slug":"vos3000-g729-annex-b-silence","status":"publish","type":"post","link":"https:\/\/www.vos3000.com\/blog\/vos3000-g729-annex-b-silence\/","title":{"rendered":"VOS3000 G729 Annex B Silence Advanced Suppression Handling Easy Configuration"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-g-729-annex-b-silence-advanced-suppression-handling-configuration\">VOS3000 G729 Annex B Silence Advanced Suppression Handling Configuration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udf99\ufe0f How does your VOS3000 softswitch handle silence during G.729 codec calls? What happens when both parties are not speaking \u2014 does the gateway continue transmitting full-rate audio packets, or does it use silence suppression to save bandwidth? The answer depends on the <strong>VOS3000 G729 Annex B silence<\/strong> configuration, a per-gateway setting that controls how the G.729 Annex B comfort noise and voice activity detection (VAD) mechanism is negotiated between VOS3000 and the routing gateway. \ud83c\udfaf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd04 G.729 Annex B is the silence suppression extension of the G.729 codec standard. When enabled, VAD detects when a speaker is silent and instead of sending full-rate G.729 frames, it sends comfort noise parameters at a dramatically reduced bitrate \u2014 typically saving 50-60% of bandwidth during silent periods. The <strong>VOS3000 G729 Annex B silence<\/strong> parameter offers five configuration modes \u2014 Auto, Yes, No, None, and Passthrough \u2014 giving you precise control over how silence suppression is negotiated on each routing gateway. According to the VOS3000 V2.1.9.07 Manual \u00a72.5.1.1, this setting is available in both the SIP and H323 protocol sections of the routing gateway Additional settings. \u2699\ufe0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 All data in this guide is sourced exclusively from the official VOS3000 V2.1.9.07 Manual, Section 2.5.1.1 (Routing Gateway, pages 43 and 45) \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-g-729-annex-b-silence-advanced-suppression-handling-configuration\">VOS3000 G729 Annex B Silence Advanced Suppression Handling Configuration<\/a><ul><li><a href=\"#\ud83d\udd10-what-is-vos-3000-g-729-annex-b-silence\">\ud83d\udd10 What Is VOS3000 G729 Annex B Silence?<\/a><ul><li><a href=\"#\ud83c\udfaf-why-vos-3000-g-729-annex-b-silence-matters\">\ud83c\udfaf Why VOS3000 G729 Annex B Silence Matters<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-g-729-annex-b-technical-background\">\u2699\ufe0f G.729 Annex B Technical Background<\/a><\/li><li><a href=\"#\ud83d\udccb-vos-3000-g-729-annex-b-silence-five-modes-deep-dive\">\ud83d\udccb VOS3000 G729 Annex B Silence \u2014 Five Modes Deep Dive<\/a><ul><li><a href=\"#\ud83d\udd39-mode-1-auto-gateways-own-setting\">\ud83d\udd39 Mode 1: Auto \u2014 Gateway&#8217;s Own Setting<\/a><\/li><li><a href=\"#\ud83d\udd39-mode-2-yes-force-annex-b-enabled\">\ud83d\udd39 Mode 2: Yes \u2014 Force Annex B Enabled<\/a><\/li><li><a href=\"#\ud83d\udd39-mode-3-no-force-annex-b-disabled\">\ud83d\udd39 Mode 3: No \u2014 Force Annex B Disabled<\/a><\/li><li><a href=\"#\ud83d\udd39-mode-4-none-omit-annex-b-parameter\">\ud83d\udd39 Mode 4: None \u2014 Omit Annex B Parameter<\/a><\/li><li><a href=\"#\ud83d\udd39-mode-5-passthrough-use-callers-setting\">\ud83d\udd39 Mode 5: Passthrough \u2014 Use Caller&#8217;s Setting<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-vos-3000-g-729-annex-b-silence-mode-comparison-table\">\ud83d\udcca VOS3000 G729 Annex B Silence \u2014 Mode Comparison Table<\/a><\/li><li><a href=\"#\ud83d\udd17-g-729-negotiation-mode-and-annex-b-relationship\">\ud83d\udd17 G729 Negotiation Mode and Annex B Relationship<\/a><\/li><li><a href=\"#\ud83d\udccb-g-723-annex-a-same-pattern-as-g-729-annex-b\">\ud83d\udccb G723 AnnexA \u2014 Same Pattern as G729 Annex B<\/a><\/li><li><a href=\"#\ud83d\udccb-step-by-step-vos-3000-g-729-annex-b-silence-configuration\">\ud83d\udccb Step-by-Step VOS3000 G729 Annex B Silence Configuration<\/a><ul><li><a href=\"#step-1-open-routing-gateway-settings-\ud83d\udccb\">Step 1: Open Routing Gateway Settings \ud83d\udccb<\/a><\/li><li><a href=\"#step-2-configure-g-729-annex-b-in-sip-section-\ud83d\udd11\">Step 2: Configure G729 Annex B in SIP Section \ud83d\udd11<\/a><\/li><li><a href=\"#step-3-configure-g-729-negotiation-mode-\ud83d\udcca\">Step 3: Configure G729 Negotiation Mode \ud83d\udcca<\/a><\/li><li><a href=\"#step-4-configure-for-h-323-gateways-if-applicable-\ud83d\udd0d\">Step 4: Configure for H323 Gateways (If Applicable) \ud83d\udd0d<\/a><\/li><li><a href=\"#step-5-verify-with-sip-h-323-debug-\ud83d\udd0d\">Step 5: Verify with SIP\/H323 Debug \ud83d\udd0d<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-vos-3000-g-729-annex-b-silence-deployment-best-practices\">\ud83d\udcca VOS3000 G729 Annex B Silence \u2014 Deployment Best Practices<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-vos-3000-g-729-annex-b-silence-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 G729 Annex B Silence Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-voice-clipping-or-choppy-audio\">\u274c Problem 1: Voice Clipping or Choppy Audio<\/a><\/li><li><a href=\"#\u274c-problem-2-excessive-bandwidth-consumption\">\u274c Problem 2: Excessive Bandwidth Consumption<\/a><\/li><li><a href=\"#\u274c-problem-3-codec-negotiation-failure\">\u274c Problem 3: Codec Negotiation Failure<\/a><\/li><li><a href=\"#\u274c-problem-4-inconsistent-behavior-between-sip-and-h-323\">\u274c Problem 4: Inconsistent Behavior Between SIP and H323<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-complete-g-729-configuration-quick-reference\">\ud83d\udcde Complete G729 Configuration Quick Reference<\/a><\/li><li><a href=\"#\ud83d\udca1-vos-3000-g-729-annex-b-silence-configuration-checklist\">\ud83d\udca1 VOS3000 G729 Annex B Silence Configuration Checklist<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-is-the-vos-3000-g-729-annex-b-silence-setting\">\u2753 What is the VOS3000 G729 Annex B silence setting?<\/a><\/li><li><a href=\"#\u2753-what-is-g-729-annex-b-silence-suppression\">\u2753 What is G.729 Annex B silence suppression?<\/a><\/li><li><a href=\"#\u2753-should-i-enable-or-disable-g-729-annex-b-on-my-gateway\">\u2753 Should I enable or disable G729 Annex B on my gateway?<\/a><\/li><li><a href=\"#\u2753-what-is-the-difference-between-auto-and-passthrough-for-g-729-annex-b\">\u2753 What is the difference between Auto and Passthrough for G729 Annex B?<\/a><\/li><li><a href=\"#\u2753-does-the-vos-3000-g-729-annex-b-silence-setting-affect-g-723-1-codec\">\u2753 Does the VOS3000 G729 Annex B silence setting affect G723.1 codec?<\/a><\/li><li><a href=\"#\u2753-can-i-set-different-g-729-annex-b-modes-on-different-gateways\">\u2753 Can I set different G729 Annex B modes on different gateways?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-expert-help-with-vos-3000-g-729-annex-b-silence\">\ud83d\udcde Need Expert Help with VOS3000 G729 Annex B Silence?<\/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-g-729-annex-b-silence\">\ud83d\udd10 What Is VOS3000 G729 Annex B Silence?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f1\ufe0f The <strong>VOS3000 G729 Annex B silence<\/strong> setting controls whether and how the G.729 Annex B silence suppression (VAD) extension is negotiated when VOS3000 routes calls through a specific routing gateway using the G.729 codec family. This parameter appears in the routing gateway&#8217;s Additional settings under both the SIP and H323 protocol sections, and it has five distinct modes that determine the annexb parameter in the SDP or H.245 codec negotiation. \ud83d\udccb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc According to the official VOS3000 V2.1.9.07 Manual, Section 2.5.1.1 (page 43):<\/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\">Mode<\/th><th class=\"has-text-align-left\" data-align=\"left\">SDP annexb Value<\/th><th class=\"has-text-align-left\" data-align=\"left\">Manual Description<\/th><\/tr><tr><td><strong>Auto<\/strong><\/td><td>Uses routing gateway&#8217;s annexb setting<\/td><td>Send routing&#8217;s G729 annexb setting to routing<\/td><\/tr><tr><td><strong>yes<\/strong><\/td><td>annexb=yes<\/td><td>annex=yes<\/td><\/tr><tr><td><strong>no<\/strong><\/td><td>annexb=no<\/td><td>annexb=no<\/td><\/tr><tr><td><strong>None<\/strong><\/td><td>No annexb parameter<\/td><td>No annexb<\/td><\/tr><tr><td><strong>Passthrough<\/strong><\/td><td>Uses caller&#8217;s annexb setting<\/td><td>Send caller&#8217;s G729 annexb setting to routing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Key insight:<\/strong> The G.729 Annex B standard (ITU-T G.729 Annex B) defines a voice activity detection (VAD) algorithm and comfort noise generation (CNG) mechanism that works alongside the base G.729 codec. When Annex B is active, the encoder detects silent periods and transmits comfort noise parameters at approximately 1\/16th of the normal bitrate, generating substantial bandwidth savings on VoIP networks. However, VAD can occasionally clip the beginning or end of speech segments, which is why proper configuration of the <strong>VOS3000 G729 Annex B silence<\/strong> parameter is essential for balancing bandwidth efficiency against voice quality. \ud83c\udf99\ufe0f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83c\udfaf-why-vos-3000-g-729-annex-b-silence-matters\">\ud83c\udfaf Why VOS3000 G729 Annex B Silence Matters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Without proper <strong>VOS3000 G729 Annex B silence<\/strong> configuration, several critical issues can arise in your VoIP deployment:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd04 <strong>Bandwidth waste:<\/strong> Without Annex B silence suppression, G.729 transmits full-rate 8 kbit\/s audio even during silent periods, wasting up to 50-60% of bandwidth on typical voice conversations that include natural pauses<\/li>\n\n\n\n<li>\ud83c\udf99\ufe0f <strong>Voice clipping:<\/strong> With Annex B enabled on gateways that have poor VAD implementation, the beginning or end of speech can be clipped, causing &#8220;choppy&#8221; audio that frustrates callers and degrades perceived call quality<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f <strong>Codec negotiation failures:<\/strong> Mismatched annexb parameters between VOS3000 and the routing gateway can cause codec negotiation failures, resulting in one-way audio or call setup failures<\/li>\n\n\n\n<li>\ud83d\udcca <strong>Inconsistent behavior across gateways:<\/strong> Different carriers may require different annexb settings \u2014 some demand annexb=yes for bandwidth savings, while others reject Annex B due to quality concerns<\/li>\n\n\n\n<li>\ud83d\udcde <strong>Interoperability problems:<\/strong> G.729a (the reduced-complexity variant) handles Annex B differently than G.729, and incorrect <strong>VOS3000 G729 Annex B silence<\/strong> settings can cause incompatibilities between endpoints using different G.729 variants<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-g-729-annex-b-technical-background\">\u2699\ufe0f G.729 Annex B Technical Background<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd04 Understanding the <strong>VOS3000 G729 Annex B silence<\/strong> setting requires knowledge of how G.729 Annex B works at the codec level. The G.729 codec operates at 8 kbit\/s and processes audio in 10-millisecond frames. Each frame produces 80 bits of compressed audio data. When Annex B is active, the encoder classifies each frame into one of three categories and transmits accordingly. \ud83d\udce1<\/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\">Frame Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Bitrate<\/th><th class=\"has-text-align-left\" data-align=\"left\">Content<\/th><th class=\"has-text-align-left\" data-align=\"left\">When Sent<\/th><\/tr><tr><td><strong>Active speech<\/strong><\/td><td>8 kbit\/s (80 bits\/frame)<\/td><td>Full G.729 compressed speech<\/td><td>When VAD detects speech energy above threshold<\/td><\/tr><tr><td><strong>Silence \/ comfort noise<\/strong><\/td><td>~0.5 kbit\/s (15 bits\/frame)<\/td><td>Comfort noise parameters (noise level, spectral shape)<\/td><td>Periodically during silent periods<\/td><\/tr><tr><td><strong>No transmission<\/strong><\/td><td>0 kbit\/s<\/td><td>Nothing transmitted<\/td><td>Between comfort noise updates during extended silence<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcca <strong>Bandwidth impact:<\/strong> In a typical voice conversation, each party speaks approximately 35-40% of the time. Without Annex B, both directions consume 8 kbit\/s continuously (16 kbit\/s total with IP\/UDP\/RTP overhead, approximately 24 kbit\/s). With Annex B enabled, the average bandwidth drops to approximately 10-12 kbit\/s total \u2014 a savings of 50% or more. For wholesale carriers handling thousands of concurrent G.729 calls, this translates to significant capacity savings on expensive transit links. \ud83d\udcb0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-vos-3000-g-729-annex-b-silence-five-modes-deep-dive\">\ud83d\udccb VOS3000 G729 Annex B Silence \u2014 Five Modes Deep Dive<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd11 The <strong>VOS3000 G729 Annex B silence<\/strong> parameter provides five distinct modes, each suited to different deployment scenarios. Understanding the exact behavior of each mode is critical for proper gateway configuration. \ud83d\udee0\ufe0f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd39-mode-1-auto-gateways-own-setting\">\ud83d\udd39 Mode 1: Auto \u2014 Gateway&#8217;s Own Setting<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb When set to <strong>Auto<\/strong>, the <strong>VOS3000 G729 Annex B silence<\/strong> mode sends the routing gateway&#8217;s own G729 annexb setting to the routing process. According to the VOS3000 manual: &#8220;Auto: send routing&#8217;s G729 annexb setting to routing.&#8221; This means VOS3000 uses the annexb value that is configured in the routing gateway&#8217;s own protocol settings as the value to advertise during codec negotiation with the far end. \ud83d\udd04<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>When to use Auto:<\/strong> This is the recommended default mode when the routing gateway has its own properly configured annexb preference. It allows the gateway&#8217;s local configuration to control the negotiation, providing consistent behavior with the gateway&#8217;s capabilities. Use Auto when the routing gateway&#8217;s manufacturer documentation specifies whether Annex B should be enabled or disabled for optimal performance with that particular gateway model. \ud83c\udfe2<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd39-mode-2-yes-force-annex-b-enabled\">\ud83d\udd39 Mode 2: Yes \u2014 Force Annex B Enabled<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb When set to <strong>yes<\/strong>, the <strong>VOS3000 G729 Annex B silence<\/strong> mode explicitly sets annexb=yes in the SDP or H.245 negotiation. According to the VOS3000 manual: &#8220;yes: annex=yes.&#8221; This forces G.729 Annex B silence suppression to be active for all calls through this routing gateway, regardless of what the far end or the gateway&#8217;s own default setting might be. \u2699\ufe0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>When to use yes:<\/strong> Use this mode when bandwidth conservation is the top priority and you want to guarantee that silence suppression is always active. This is ideal for high-capacity wholesale routes where bandwidth costs are significant, and the gateways on both ends are confirmed to support G.729 Annex B without quality degradation. However, be aware that forcing annexb=yes on gateways with poor VAD implementations can cause noticeable voice clipping. \ud83d\udce1<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd39-mode-3-no-force-annex-b-disabled\">\ud83d\udd39 Mode 3: No \u2014 Force Annex B Disabled<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb When set to <strong>no<\/strong>, the <strong>VOS3000 G729 Annex B silence<\/strong> mode explicitly sets annexb=no in the SDP or H.245 negotiation. According to the VOS3000 manual: &#8220;no: annexb=no.&#8221; This disables G.729 Annex B silence suppression for all calls through this routing gateway, ensuring that full-rate G.729 frames are transmitted continuously, even during silent periods. \ud83d\udd07<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>When to use no:<\/strong> Use this mode when voice quality is the top priority and bandwidth conservation is not a concern. This is recommended for premium voice routes, routes that carry fax or modem signals (where silence suppression can corrupt data), and gateways with known VAD quality issues. The <strong>VOS3000 G729 Annex B silence<\/strong> set to &#8220;no&#8221; ensures clean, uninterrupted audio at the cost of higher bandwidth consumption. \ud83c\udf99\ufe0f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd39-mode-4-none-omit-annex-b-parameter\">\ud83d\udd39 Mode 4: None \u2014 Omit Annex B Parameter<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb When set to <strong>None<\/strong>, the <strong>VOS3000 G729 Annex B silence<\/strong> mode omits the annexb parameter entirely from the SDP or H.245 negotiation. According to the VOS3000 manual: &#8220;None: no annexb.&#8221; This means the codec negotiation does not include any annexb specification, leaving it up to the default behavior of the endpoints to determine whether Annex B is used. \ud83d\udcdd<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>When to use None:<\/strong> Use this mode when you want the endpoints to negotiate Annex B naturally without VOS3000 imposing a preference. Some gateway manufacturers interpret the absence of the annexb parameter as annexb=yes (Annex B enabled by default), while others interpret it as annexb=no. This mode is best when both endpoints are known to have compatible default Annex B behavior and you do not need VOS3000 to control the negotiation. \ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udd39-mode-5-passthrough-use-callers-setting\">\ud83d\udd39 Mode 5: Passthrough \u2014 Use Caller&#8217;s Setting<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb When set to <strong>Passthrough<\/strong>, the <strong>VOS3000 G729 Annex B silence<\/strong> mode forwards the caller&#8217;s G729 annexb setting to the routing gateway. According to the VOS3000 manual: &#8220;Passthrough: send caller&#8217;s G729 annexb setting to routing.&#8221; This transparently passes whatever annexb value was negotiated on the incoming (mapping) side through to the outgoing (routing) side, preserving the original caller&#8217;s Annex B preference. \ud83d\udd04<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>When to use Passthrough:<\/strong> Use this mode in transparent proxy scenarios where you want to preserve the original codec negotiation from the caller side. This is ideal for VoIP transit operations where VOS3000 acts as a passthrough between two endpoints and should not modify the Annex B behavior that was already negotiated upstream. The <strong>VOS3000 G729 Annex B silence<\/strong> Passthrough mode ensures end-to-end transparency of the silence suppression setting. \ud83d\udce1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-vos-3000-g-729-annex-b-silence-mode-comparison-table\">\ud83d\udcca VOS3000 G729 Annex B Silence \u2014 Mode Comparison Table<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf The following table provides a side-by-side comparison of all five <strong>VOS3000 G729 Annex B silence<\/strong> modes to help you select the right configuration for each gateway:<\/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\">Mode<\/th><th class=\"has-text-align-left\" data-align=\"left\">Annex B Status<\/th><th class=\"has-text-align-left\" data-align=\"left\">Bandwidth Saving<\/th><th class=\"has-text-align-left\" data-align=\"left\">Voice Quality Risk<\/th><th class=\"has-text-align-left\" data-align=\"left\">Best For<\/th><\/tr><tr><td><strong>Auto<\/strong><\/td><td>Uses gateway&#8217;s own setting<\/td><td>Varies by gateway<\/td><td>Low<\/td><td>\ud83c\udfe2 Standard deployments with well-configured gateways<\/td><\/tr><tr><td><strong>yes<\/strong><\/td><td>Forced ON<\/td><td>\ud83d\udfe2 50-60% savings<\/td><td>\ud83d\udfe1 Medium (clipping risk)<\/td><td>\ud83d\udcca High-volume wholesale with bandwidth cost pressure<\/td><\/tr><tr><td><strong>no<\/strong><\/td><td>Forced OFF<\/td><td>\ud83d\udd34 No savings<\/td><td>\ud83d\udfe2 None<\/td><td>\ud83c\udf99\ufe0f Premium voice routes, fax\/modem, quality-critical<\/td><\/tr><tr><td><strong>None<\/strong><\/td><td>Omitted from negotiation<\/td><td>Varies by endpoint<\/td><td>\ud83d\udfe1 Unpredictable<\/td><td>\ud83d\udd27 Compatible endpoints with matching defaults<\/td><\/tr><tr><td><strong>Passthrough<\/strong><\/td><td>Uses caller&#8217;s setting<\/td><td>Depends on caller<\/td><td>\ud83d\udfe2 Low<\/td><td>\ud83d\udce1 VoIP transit, transparent proxy<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde For guidance on G729 codec negotiation beyond Annex B, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-g729-negotiation-mode-fix\/\" target=\"_blank\" rel=\"noopener\">VOS3000 G729 negotiation mode fix<\/a> guide. Need help configuring silence suppression? Reach us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udcf1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd17-g-729-negotiation-mode-and-annex-b-relationship\">\ud83d\udd17 G729 Negotiation Mode and Annex B Relationship<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb The <strong>VOS3000 G729 Annex B silence<\/strong> setting works in conjunction with the G729 negotiation mode, which controls how G.729 and G.729a codec variants are handled. According to the VOS3000 V2.1.9.07 Manual \u00a72.5.1.1 (pages 43 and 45), the G729 negotiation mode has four options: \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\">G729 Negotiation Mode<\/th><th class=\"has-text-align-left\" data-align=\"left\">Manual Description<\/th><th class=\"has-text-align-left\" data-align=\"left\">Annex B Impact<\/th><\/tr><tr><td><strong>Auto<\/strong><\/td><td>Keep original G729 codec<\/td><td>Preserves original codec variant and its Annex B capability<\/td><\/tr><tr><td><strong>G729<\/strong><\/td><td>Treat G729a or G729 as G729<\/td><td>Converts to G.729 \u2014 full Annex B support<\/td><\/tr><tr><td><strong>G729a<\/strong><\/td><td>Treat G729 or G729a as G729a<\/td><td>Converts to G.729a \u2014 Annex B supported with reduced complexity<\/td><\/tr><tr><td><strong>G729&amp;G729a<\/strong><\/td><td>Treat G729 or G729a as G729 and G729a<\/td><td>Offers both variants \u2014 each with its own Annex B capability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Important:<\/strong> The G729 negotiation mode determines which G.729 variant is advertised in the SDP, while the <strong>VOS3000 G729 Annex B silence<\/strong> setting determines whether the annexb parameter is included and what value it takes. These two settings are independent but complementary \u2014 the negotiation mode controls the codec identity, and the Annex B setting controls the silence suppression behavior within that codec. For complete codec configuration, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-codec-priority-configuration\/\" target=\"_blank\" rel=\"noopener\">VOS3000 codec priority configuration<\/a> guide. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-g-723-annex-a-same-pattern-as-g-729-annex-b\">\ud83d\udccb G723 AnnexA \u2014 Same Pattern as G729 Annex B<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd11 The VOS3000 manual states that <strong>G723 annexa<\/strong> follows the same configuration pattern as <strong>G729 annexb<\/strong>: &#8220;G723 annexa: refer to G729 annexb.&#8221; This means the same five modes \u2014 Auto, yes, no, None, and Passthrough \u2014 are available for the G.723.1 Annex A silence suppression setting, with identical behavior for each mode. \ud83d\udccb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc G.723.1 Annex A provides the same VAD and comfort noise generation functionality for the G.723.1 codec as G.729 Annex B provides for G.729. The G.723.1 codec operates at either 5.3 kbit\/s or 6.3 kbit\/s, and Annex A adds silence suppression capability to both rates. When configuring the <strong>VOS3000 G729 Annex B silence<\/strong> setting, keep in mind that the G723 annexa setting follows the exact same logic for any gateways using the G.723.1 codec. \ud83c\udfaf<\/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\">G729 Annex B<\/th><th class=\"has-text-align-left\" data-align=\"left\">G723 Annex A<\/th><\/tr><tr><td>Base codec<\/td><td>G.729 \/ G.729a (8 kbit\/s)<\/td><td>G.723.1 (5.3\/6.3 kbit\/s)<\/td><\/tr><tr><td>Silence suppression<\/td><td>VAD + Comfort Noise (Annex B)<\/td><td>VAD + Comfort Noise (Annex A)<\/td><\/tr><tr><td>Configuration modes<\/td><td>Auto \/ yes \/ no \/ None \/ Passthrough<\/td><td>Auto \/ yes \/ no \/ None \/ Passthrough<\/td><\/tr><tr><td>Manual reference<\/td><td>\u00a72.5.1.1, page 43 (SIP), page 45 (H323)<\/td><td>&#8220;Refer to G729 annexb&#8221; (same page)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-step-by-step-vos-3000-g-729-annex-b-silence-configuration\">\ud83d\udccb Step-by-Step VOS3000 G729 Annex B Silence Configuration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u2699\ufe0f Follow these steps to configure the <strong>VOS3000 G729 Annex B silence<\/strong> parameter on a routing gateway:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-open-routing-gateway-settings-\ud83d\udccb\">Step 1: Open Routing Gateway Settings \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 Routing gateway<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Select the routing gateway that requires G729 Annex B configuration<\/li>\n\n\n\n<li>\ud83d\udd27 Click <strong>Additional settings<\/strong> to expand the gateway&#8217;s protocol configuration<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-configure-g-729-annex-b-in-sip-section-\ud83d\udd11\">Step 2: Configure G729 Annex B in SIP Section \ud83d\udd11<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udccc Navigate to: <strong>Additional settings \u2192 Protocol \u2192 SIP<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d Locate the <strong>G729 annexb<\/strong> dropdown setting<\/li>\n\n\n\n<li>\u270f\ufe0f Select the appropriate mode:\n<ul class=\"wp-block-list\">\n<li><strong>Auto<\/strong> \u2014 Use the gateway&#8217;s own annexb setting<\/li>\n\n\n\n<li><strong>yes<\/strong> \u2014 Force Annex B enabled (bandwidth savings)<\/li>\n\n\n\n<li><strong>no<\/strong> \u2014 Force Annex B disabled (best quality)<\/li>\n\n\n\n<li><strong>None<\/strong> \u2014 Omit annexb from negotiation<\/li>\n\n\n\n<li><strong>Passthrough<\/strong> \u2014 Use caller&#8217;s annexb setting<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\ud83d\udcbe Save the gateway settings<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-3-configure-g-729-negotiation-mode-\ud83d\udcca\">Step 3: Configure G729 Negotiation Mode \ud83d\udcca<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udccc In the same SIP protocol section, locate the <strong>G729 negotiation mode<\/strong> setting<\/li>\n\n\n\n<li>\u270f\ufe0f Select the appropriate mode:\n<ul class=\"wp-block-list\">\n<li><strong>Auto<\/strong> \u2014 Keep original G729 codec<\/li>\n\n\n\n<li><strong>G729<\/strong> \u2014 Treat all as G729<\/li>\n\n\n\n<li><strong>G729a<\/strong> \u2014 Treat all as G729a<\/li>\n\n\n\n<li><strong>G729&amp;G729a<\/strong> \u2014 Offer both variants<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\ud83d\udcbe Save the settings<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-4-configure-for-h-323-gateways-if-applicable-\ud83d\udd0d\">Step 4: Configure for H323 Gateways (If Applicable) \ud83d\udd0d<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\ud83d\udccc Navigate to: <strong>Additional settings \u2192 Protocol \u2192 H323<\/strong><\/li>\n\n\n\n<li>\ud83d\udd0d The G729 negotiation mode and G729 annexb settings are also available here<\/li>\n\n\n\n<li>\u270f\ufe0f Configure the same or different <strong>VOS3000 G729 Annex B silence<\/strong> mode based on the H323 gateway requirements<\/li>\n\n\n\n<li>\ud83d\udcbe Save all gateway configuration changes<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"step-5-verify-with-sip-h-323-debug-\ud83d\udd0d\">Step 5: Verify with SIP\/H323 Debug \ud83d\udd0d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcdd After configuration, verify that the annexb parameter appears correctly in the SDP or H.245 negotiation. For comprehensive debugging techniques, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-debug-guide\/\" target=\"_blank\" rel=\"noopener\">VOS3000 SIP debug guide<\/a>. \ud83d\udd27<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\ud83d\udd0d Verifying VOS3000 G729 Annex B Silence Configuration:\n\nSIP Mode \u2014 Check SDP in INVITE or 200 OK:\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\u2510\n\u2502 v=0                                              \u2502\n\u2502 o=- 12345 12345 IN IP4 192.168.1.100            \u2502\n\u2502 s=Session                                        \u2502\n\u2502 c=IN IP4 192.168.1.100                           \u2502\n\u2502 t=0 0                                            \u2502\n\u2502 m=audio 8000 RTP\/AVP 18                          \u2502\n\u2502 a=rtpmap:18 G729\/8000                           \u2502\n\u2502 a=fmtp:18 annexb=yes    \u2190 VOS3000 G729 Annex B  \u2502\n\u2502                         \u2190 yes mode = annexb=yes  \u2502\n\u2502                         \u2190 no mode = annexb=no    \u2502\n\u2502                         \u2190 None mode = omitted    \u2502\n\u2502                         \u2190 Auto = gateway default \u2502\n\u2502                         \u2190 Passthrough = caller's \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\u2518\n\n\u2705 Confirm annexb value matches your configured mode\n\u2705 Confirm both SIP and H323 sections are configured\n\u2705 Test call quality with and without Annex B\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-vos-3000-g-729-annex-b-silence-deployment-best-practices\">\ud83d\udcca VOS3000 G729 Annex B Silence \u2014 Deployment Best Practices<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf Different VoIP deployment scenarios require different <strong>VOS3000 G729 Annex B silence<\/strong> configurations. Here are recommended settings based on the VOS3000 manual specifications and real-world deployment experience: \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\">Deployment Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommended Mode<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rationale<\/th><\/tr><tr><td>\ud83d\udcde High-volume wholesale (G.729 only)<\/td><td>yes<\/td><td>Maximum bandwidth savings; quality impact acceptable for wholesale voice<\/td><\/tr><tr><td>\ud83c\udfe2 Premium enterprise voice<\/td><td>no<\/td><td>Best voice quality; bandwidth cost is secondary for premium services<\/td><\/tr><tr><td>\ud83c\udf10 VoIP transit \/ proxy<\/td><td>Passthrough<\/td><td>Preserves original Annex B negotiation from caller side<\/td><\/tr><tr><td>\ud83d\udce1 Mixed gateway fleet<\/td><td>Auto<\/td><td>Let each gateway use its own configured default setting<\/td><\/tr><tr><td>\ud83d\udce0 Fax\/modem routes<\/td><td>no<\/td><td>Silence suppression corrupts fax and modem signals; must be disabled<\/td><\/tr><tr><td>\ud83d\udda5\ufe0f Carrier interconnect<\/td><td>Per carrier requirement<\/td><td>Follow the specific carrier&#8217;s interconnect specification for Annex B<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Important:<\/strong> The <strong>VOS3000 G729 Annex B silence<\/strong> setting is configured per-gateway, so you can set different modes on different gateways. This is especially useful when some routes require bandwidth savings while others require maximum voice quality. For related media configuration, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-rtp-media\/\" target=\"_blank\" rel=\"noopener\">VOS3000 RTP media<\/a> guide and <a href=\"https:\/\/multahost.com\/blog\/vos3000-media-proxy\/\" target=\"_blank\" rel=\"noopener\">VOS3000 media proxy<\/a> reference. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-vos-3000-g-729-annex-b-silence-problems-and-solutions\">\ud83d\udee1\ufe0f Common VOS3000 G729 Annex B Silence Problems and Solutions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Misconfigured <strong>VOS3000 G729 Annex B silence<\/strong> settings can cause a range of issues. Here are the most common problems and their solutions:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-voice-clipping-or-choppy-audio\">\u274c Problem 1: Voice Clipping or Choppy Audio<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> Callers report that the first or last syllable of words is cut off, resulting in choppy or &#8220;clipped&#8221; audio quality on G.729 calls through a specific gateway.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The <strong>VOS3000 G729 Annex B silence<\/strong> mode is set to &#8220;yes&#8221; (forcing Annex B on), but the gateway or endpoint has a poor VAD implementation that cannot reliably distinguish speech from silence, leading to speech frames being misclassified as silence.<\/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 Change the <strong>VOS3000 G729 Annex B silence<\/strong> mode to &#8220;no&#8221; on this gateway to disable silence suppression<\/li>\n\n\n\n<li>\ud83d\udccb Test with &#8220;Auto&#8221; mode to see if the gateway&#8217;s own VAD performs better<\/li>\n\n\n\n<li>\ud83d\udd0d If bandwidth savings are essential, try a different gateway model with better VAD quality<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-excessive-bandwidth-consumption\">\u274c Problem 2: Excessive Bandwidth Consumption<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> G.729 calls through a high-volume gateway are consuming significantly more bandwidth than expected, with no silence suppression taking effect during quiet periods.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The <strong>VOS3000 G729 Annex B silence<\/strong> mode is set to &#8220;no&#8221; or &#8220;None&#8221; (omitting the parameter), and the gateway defaults to no silence suppression, resulting in continuous full-rate G.729 transmission.<\/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 Change the <strong>VOS3000 G729 Annex B silence<\/strong> mode to &#8220;yes&#8221; to force Annex B enabled<\/li>\n\n\n\n<li>\ud83d\udcca Monitor bandwidth usage before and after the change to confirm savings<\/li>\n\n\n\n<li>\ud83d\udcde Verify that the gateway supports G.729 Annex B by checking its documentation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-codec-negotiation-failure\">\u274c Problem 3: Codec Negotiation Failure<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> Calls to a specific routing gateway fail during codec negotiation, resulting in 488 Not Acceptable Here or 415 Unsupported Media Type responses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The <strong>VOS3000 G729 Annex B silence<\/strong> setting is advertising an annexb parameter value that the far-end gateway does not support or rejects. Some older gateways do not understand the annexb parameter in the SDP and reject the entire codec offer.<\/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 Change the <strong>VOS3000 G729 Annex B silence<\/strong> mode to &#8220;None&#8221; to omit the annexb parameter entirely<\/li>\n\n\n\n<li>\ud83d\udccb Check the far-end gateway&#8217;s codec support documentation<\/li>\n\n\n\n<li>\ud83d\udd0d Review SIP debug traces to see the exact SDP offer and rejection<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-4-inconsistent-behavior-between-sip-and-h-323\">\u274c Problem 4: Inconsistent Behavior Between SIP and H323<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd0d <strong>Symptom:<\/strong> The same routing gateway produces different Annex B behavior depending on whether the call uses SIP or H323 protocol.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 <strong>Cause:<\/strong> The <strong>VOS3000 G729 Annex B silence<\/strong> setting is configured differently in the SIP and H323 protocol sections of the routing gateway&#8217;s Additional settings.<\/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 that both SIP and H323 protocol sections have the same G729 annexb setting<\/li>\n\n\n\n<li>\ud83d\udccb Remember that H323 uses H.245 for codec negotiation instead of SDP<\/li>\n\n\n\n<li>\ud83d\udd0d Test with both protocols after making configuration changes<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-complete-g-729-configuration-quick-reference\">\ud83d\udcde Complete G729 Configuration Quick Reference<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcca Here is the complete reference for all G729-related parameters and settings in the VOS3000 routing gateway configuration: \ud83d\udccb<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Setting<\/th><th class=\"has-text-align-left\" data-align=\"left\">Options<\/th><th class=\"has-text-align-left\" data-align=\"left\">Location<\/th><th class=\"has-text-align-left\" data-align=\"left\">Function<\/th><\/tr><tr><td><strong>G729 annexb<\/strong><\/td><td>Auto \/ yes \/ no \/ None \/ Passthrough<\/td><td>Additional settings \u2192 Protocol \u2192 SIP<\/td><td>Controls G.729 Annex B silence suppression negotiation<\/td><\/tr><tr><td>G729 negotiation mode<\/td><td>Auto \/ G729 \/ G729a \/ G729&amp;G729a<\/td><td>Additional settings \u2192 Protocol \u2192 SIP<\/td><td>Controls which G.729 variant is advertised<\/td><\/tr><tr><td>G723 annexa<\/td><td>Auto \/ yes \/ no \/ None \/ Passthrough<\/td><td>Additional settings \u2192 Protocol \u2192 SIP<\/td><td>Same as G729 annexb but for G.723.1 codec<\/td><\/tr><tr><td>G729 annexb (H323)<\/td><td>Auto \/ yes \/ no \/ None \/ Passthrough<\/td><td>Additional settings \u2192 Protocol \u2192 H323<\/td><td>Same as SIP but for H.323 gateways<\/td><\/tr><tr><td>G729 negotiation mode (H323)<\/td><td>Auto \/ G729 \/ G729a \/ G729&amp;G729a<\/td><td>Additional settings \u2192 Protocol \u2192 H323<\/td><td>Same as SIP but for H.323 gateways<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 For complete documentation on all routing gateway parameters, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\" target=\"_blank\" rel=\"noopener\">VOS3000 parameter description<\/a> reference. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udca1-vos-3000-g-729-annex-b-silence-configuration-checklist\">\ud83d\udca1 VOS3000 G729 Annex B Silence Configuration Checklist<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 Use this checklist when deploying or tuning your <strong>VOS3000 G729 Annex B silence<\/strong> settings:<\/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\">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 G729 annexb to appropriate mode for each routing gateway (Auto\/yes\/no\/None\/Passthrough)<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 2<\/td><td>Configure G729 negotiation mode (Auto\/G729\/G729a\/G729&amp;G729a) to match gateway capabilities<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 3<\/td><td>Set G723 annexa to same mode as G729 annexb if using G.723.1 codec<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 4<\/td><td>Verify both SIP and H323 protocol sections have consistent annexb settings<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 5<\/td><td>Test call quality with the selected VOS3000 G729 Annex B silence mode<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 6<\/td><td>Verify SDP annexb parameter in SIP debug trace matches configured mode<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 7<\/td><td>Monitor bandwidth usage to confirm silence suppression savings when annexb=yes<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 8<\/td><td>Disable Annex B (annexb=no) on gateways carrying fax or modem traffic<\/td><td>\u2610<\/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-vos-3000-g-729-annex-b-silence-setting\">\u2753 What is the VOS3000 G729 Annex B silence setting?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udf99\ufe0f The <strong>VOS3000 G729 Annex B silence<\/strong> setting controls how the G.729 Annex B silence suppression (VAD) extension is negotiated on each routing gateway. According to the VOS3000 V2.1.9.07 Manual \u00a72.5.1.1, it has five modes: Auto (uses the gateway&#8217;s own annexb setting), yes (forces annexb=yes), no (forces annexb=no), None (omits the annexb parameter), and Passthrough (uses the caller&#8217;s annexb setting). The VOS3000 G729 Annex B silence setting is found in the routing gateway&#8217;s Additional settings under both the SIP and H323 protocol sections. When configured correctly, it balances bandwidth savings from silence suppression against voice quality concerns from VAD clipping. \ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-g-729-annex-b-silence-suppression\">\u2753 What is G.729 Annex B silence suppression?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcca G.729 Annex B is the silence suppression extension defined in ITU-T G.729 Annex B. It adds a voice activity detection (VAD) algorithm and comfort noise generation (CNG) mechanism to the base G.729 codec. When active, the encoder detects silent periods during a conversation and transmits comfort noise parameters at approximately 0.5 kbit\/s instead of the full 8 kbit\/s, saving up to 50-60% of bandwidth during typical voice conversations. The <strong>VOS3000 G729 Annex B silence<\/strong> setting determines whether this extension is negotiated and enabled for calls through each routing gateway.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-should-i-enable-or-disable-g-729-annex-b-on-my-gateway\">\u2753 Should I enable or disable G729 Annex B on my gateway?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83c\udfaf The decision depends on your priorities. Enable the <strong>VOS3000 G729 Annex B silence<\/strong> (set to &#8220;yes&#8221;) when bandwidth cost is the primary concern and the gateway has a good VAD implementation. Disable it (set to &#8220;no&#8221;) when voice quality is paramount, when the route carries fax or modem traffic, or when the gateway has known VAD quality issues that cause voice clipping. For most deployments, starting with &#8220;Auto&#8221; mode and then testing &#8220;yes&#8221; or &#8220;no&#8221; based on observed quality is the safest approach. The per-gateway nature of the VOS3000 G729 Annex B silence setting allows you to optimize each route independently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-difference-between-auto-and-passthrough-for-g-729-annex-b\">\u2753 What is the difference between Auto and Passthrough for G729 Annex B?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd04 The key difference is the source of the annexb value. With <strong>Auto<\/strong> mode, the VOS3000 G729 Annex B silence setting uses the routing gateway&#8217;s own configured annexb preference \u2014 the gateway&#8217;s local setting controls what value is advertised. With <strong>Passthrough<\/strong> mode, VOS3000 forwards the caller&#8217;s (mapping side) G729 annexb setting to the routing side, preserving the original Annex B negotiation from the incoming call. Auto is best for standard deployments where each gateway has its own known preference, while Passthrough is best for transparent VoIP transit where VOS3000 should not modify the original codec negotiation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-does-the-vos-3000-g-729-annex-b-silence-setting-affect-g-723-1-codec\">\u2753 Does the VOS3000 G729 Annex B silence setting affect G723.1 codec?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccb Yes, indirectly. The VOS3000 manual states &#8220;G723 annexa: refer to G729 annexb,&#8221; meaning the G.723.1 Annex A silence suppression setting follows the same five-mode pattern (Auto, yes, no, None, Passthrough) as the <strong>VOS3000 G729 Annex B silence<\/strong> setting. However, they are separate configuration items \u2014 changing the G729 annexb setting does not automatically change the G723 annexa setting. If your gateways use both G.729 and G.723.1 codecs, you should configure both settings according to the same logic, ensuring consistent silence suppression behavior across both codec families.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-set-different-g-729-annex-b-modes-on-different-gateways\">\u2753 Can I set different G729 Annex B modes on different gateways?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 Yes, the <strong>VOS3000 G729 Annex B silence<\/strong> setting is configured per-gateway, so each routing gateway can have a different Annex B mode. This is particularly useful when you have a mix of gateways with different VAD capabilities or when different routes have different quality and bandwidth requirements. You might set annexb=yes on high-volume wholesale gateways for bandwidth savings, while setting annexb=no on premium voice gateways for maximum quality. The per-gateway flexibility of the VOS3000 G729 Annex B silence setting ensures you can optimize each route independently. Need help? Contact us on <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">WhatsApp at +8801911119966<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-expert-help-with-vos-3000-g-729-annex-b-silence\">\ud83d\udcde Need Expert Help with VOS3000 G729 Annex B Silence?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd27 The <strong>VOS3000 G729 Annex B silence<\/strong> configuration is a critical setting for any VoIP deployment that uses the G.729 codec family. Without proper configuration, you risk either wasting significant bandwidth through unnecessary full-rate transmission or degrading voice quality through aggressive silence suppression. When configured correctly, the VOS3000 G729 Annex B silence setting enables the right balance of bandwidth efficiency and voice quality for each routing gateway. Whether you are deploying G.729 for the first time, troubleshooting voice clipping issues, or optimizing bandwidth across a mixed gateway fleet, expert guidance ensures your codec configuration is optimal. \ud83d\udcb0<\/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 immediate assistance with VOS3000 G729 Annex B silence configuration, codec negotiation troubleshooting, bandwidth optimization, and voice quality issues. Our team specializes in VOS3000 codec configuration, media handling, and carrier-grade VoIP operations. \ud83d\udd27<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udd17 Explore related VOS3000 codec and media configuration guides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-g729-negotiation-mode-fix\/\" target=\"_blank\" rel=\"noopener\">VOS3000 G729 Negotiation Mode Fix<\/a> \u2014 G729 codec negotiation troubleshooting<\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-codec-priority-configuration\/\" target=\"_blank\" rel=\"noopener\">VOS3000 Codec Priority Configuration<\/a> \u2014 Codec selection and priority setup<\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-codec-g729-transcoding\/\" target=\"_blank\" rel=\"noopener\">VOS3000 Codec G729 Transcoding<\/a> \u2014 G729 transcoding configuration<\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-rtp-media\/\" target=\"_blank\" rel=\"noopener\">VOS3000 RTP Media<\/a> \u2014 Media handling and audio configuration<\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-call-flow\/\" target=\"_blank\" rel=\"noopener\">VOS3000 SIP Call Flow<\/a> \u2014 SIP signaling and call flow<\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-parameter-description\/\" target=\"_blank\" rel=\"noopener\">VOS3000 Parameter Description<\/a> \u2014 Complete parameter reference<\/li>\n\n\n\n<li><a href=\"https:\/\/www.vos3000.com\/\">VOS3000 Official Download<\/a> \u2014 Get the latest VOS3000 software<\/li>\n<\/ul>\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\">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-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-768x1024.png\" 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\" style=\"\"><\/td><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-768x1024.png\" 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\" style=\"\"><\/td><td><img decoding=\"async\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Lock-In-VOS3000-Aggressive-Gateway-Failover-768x1024.png\" 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\" style=\"\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 G729 Annex B silence suppression with 5 modes: Auto, Yes, No, None, Passthrough. Configure VAD per routing gateway, avoid voice clipping, and optimize bandwidth on SIP and H323 gateways.<\/p>\n","protected":false},"author":1,"featured_media":1431,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kadence_starter_templates_imported_post":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_post_was_ever_published":false},"categories":[1],"tags":[9330,9310,9314,9289,9288,9311,9287,9292,9329,9309,9322,9293,9290,9296,9316,9308,9291,9300,9323,9315,9312,9304,9307,9313,9331,9324,9327,9306,9325,5581,9317,9294,9332,9333,9295,9320,9305,9321,9318,9302,9299,5585,9297,9326,7423,9301,9298,9328,9303,9319],"class_list":["post-1452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000-softswitch","tag-vos3000-codec-negotiation-gateway","tag-vos3000-g723-annexa-configuration","tag-vos3000-g729-additional-settings","tag-vos3000-g729-annex-b-configuration","tag-vos3000-g729-annex-b-silence","tag-vos3000-g729-annex-b-troubleshooting","tag-vos3000-g729-annexb","tag-vos3000-g729-annexb-auto","tag-vos3000-g729-annexb-deployment","tag-vos3000-g729-annexb-h323-protocol","tag-vos3000-g729-annexb-itu-t","tag-vos3000-g729-annexb-no","tag-vos3000-g729-annexb-none","tag-vos3000-g729-annexb-passthrough","tag-vos3000-g729-annexb-per-gateway","tag-vos3000-g729-annexb-sip-protocol","tag-vos3000-g729-annexb-yes","tag-vos3000-g729-bandwidth-saving","tag-vos3000-g729-codec-bandwidth-optimization","tag-vos3000-g729-codec-compatibility","tag-vos3000-g729-codec-gateway-settings","tag-vos3000-g729-codec-negotiation","tag-vos3000-g729-codec-parameters","tag-vos3000-g729-codec-passthrough","tag-vos3000-g729-codec-quality","tag-vos3000-g729-codec-routing-gateway","tag-vos3000-g729-codec-selection","tag-vos3000-g729-comfort-noise","tag-vos3000-g729-comfort-noise-generation","tag-vos3000-g729-negotiation-mode","tag-vos3000-g729-silence-detection","tag-vos3000-g729-silence-suppression","tag-vos3000-g729-silence-suppression-best-practice","tag-vos3000-g729-silence-suppression-guide","tag-vos3000-g729-vad","tag-vos3000-g729-vad-configuration","tag-vos3000-g729-voice-clipping","tag-vos3000-g729-voice-clipping-fix","tag-vos3000-g729a-annexb","tag-vos3000-g729a-codec-handling","tag-vos3000-h323-g729-annexb","tag-vos3000-routing-gateway-codec","tag-vos3000-routing-gateway-g729","tag-vos3000-routing-gateway-protocol-h323","tag-vos3000-routing-gateway-protocol-sip","tag-vos3000-silence-suppression-vad","tag-vos3000-sip-g729-annexb","tag-vos3000-softswitch-g729-setting","tag-vos3000-voice-activity-detection","tag-vos3000-voip-g729-silence"],"acf":[],"jetpack_featured_media_url":"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Interrupt-Detection-VOS3000-Lowest-Profit-Rate-Limit-VOS3000-Max-Minute-Rate-Cap-VOS3000-Sort-Lowest-Rate-Per-Second.png","blog_post_layout_featured_media_urls":{"thumbnail":["https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Interrupt-Detection-VOS3000-Lowest-Profit-Rate-Limit-VOS3000-Max-Minute-Rate-Cap-VOS3000-Sort-Lowest-Rate-Per-Second-150x150.png",150,150,true],"full":["https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-RTP-Interrupt-Detection-VOS3000-Lowest-Profit-Rate-Limit-VOS3000-Max-Minute-Rate-Cap-VOS3000-Sort-Lowest-Rate-Per-Second.png",1536,1024,false]},"categories_names":{"1":{"name":"VOS3000 Softswitch","link":"https:\/\/www.vos3000.com\/blog\/category\/vos3000-softswitch\/"}},"tags_names":{"9330":{"name":"VOS3000 codec negotiation gateway","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-codec-negotiation-gateway\/"},"9310":{"name":"VOS3000 G723 annexa configuration","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g723-annexa-configuration\/"},"9314":{"name":"VOS3000 G729 additional settings","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-additional-settings\/"},"9289":{"name":"VOS3000 G729 Annex B configuration","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annex-b-configuration\/"},"9288":{"name":"VOS3000 G729 Annex B silence","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annex-b-silence\/"},"9311":{"name":"VOS3000 G729 Annex B troubleshooting","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annex-b-troubleshooting\/"},"9287":{"name":"VOS3000 G729 annexb","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb\/"},"9292":{"name":"VOS3000 G729 annexb Auto","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-auto\/"},"9329":{"name":"VOS3000 G729 annexb deployment","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-deployment\/"},"9309":{"name":"VOS3000 G729 annexb H323 protocol","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-h323-protocol\/"},"9322":{"name":"VOS3000 G729 annexb ITU-T","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-itu-t\/"},"9293":{"name":"VOS3000 G729 annexb no","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-no\/"},"9290":{"name":"VOS3000 G729 annexb None","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-none\/"},"9296":{"name":"VOS3000 G729 annexb Passthrough","link":"https:\/\/www.vos3000.com\/blog\/tag\/vos3000-g729-annexb-passthrough\/"},"9316":{"name":"VOS3000 G729 annexb per 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