{"id":908,"date":"2026-03-31T19:07:44","date_gmt":"2026-03-31T19:07:44","guid":{"rendered":"https:\/\/www.vos3000.com\/blog\/?p=908"},"modified":"2026-03-31T19:07:53","modified_gmt":"2026-03-31T19:07:53","slug":"vos3000-media-proxy","status":"publish","type":"post","link":"https:\/\/www.vos3000.com\/blog\/vos3000-media-proxy\/","title":{"rendered":"VOS3000 Media Proxy and System Parameters: Complete Important Configuration Reference"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-media-proxy-and-system-parameters-complete-configuration-reference\">VOS3000 Media Proxy and System Parameters: Complete Configuration Reference<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>VOS3000 media proxy and system parameters control the core functionality of your VoIP softswitch.<\/strong> Proper configuration of these parameters determines call quality, NAT traversal success, security levels, and overall system performance. This comprehensive reference guide covers all critical parameters from the official VOS3000 2.1.9.07 manual, explaining their functions and recommended configurations for different deployment scenarios.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcde <strong>Need help configuring VOS3000 parameters?<\/strong> WhatsApp: <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noreferrer noopener\">+8801911119966<\/a><\/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-media-proxy-and-system-parameters-complete-configuration-reference\">VOS3000 Media Proxy and System Parameters: Complete Configuration Reference<\/a><ul><li><a href=\"#\ud83d\udce1-understanding-media-proxy-in-vos-3000\">\ud83d\udce1 Understanding Media Proxy in VOS3000<\/a><ul><li><a href=\"#\ud83d\udcca-media-proxy-modes\">\ud83d\udcca vos3000 Media Proxy Modes<\/a><\/li><li><a href=\"#\u2699\ufe0f-media-proxy-auto-mode-decision-logic\">\u2699\ufe0f Media Proxy Auto Mode Decision Logic (VOS3000 Media Proxy)<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd27-configuring-media-proxy-parameters\">\ud83d\udd27 Configuring VOS3000 Media Proxy Parameters <\/a><ul><li><a href=\"#\ud83d\udccd-location-in-vos-3000-client\">\ud83d\udccd Location in VOS3000 Client<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udce1-rtp-port-configuration\">\ud83d\udce1 RTP Port Configuration (VOS3000 Media Proxy)<\/a><ul><li><a href=\"#\ud83d\udcca-rtp-port-parameters\">\ud83d\udcca RTP Port Parameters<\/a><\/li><li><a href=\"#\u2699\ufe0f-rtp-port-sizing-calculation\">\u2699\ufe0f RTP Port Sizing Calculation<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd11-sip-parameters-reference\">\ud83d\udd11 SIP Parameters Reference (VOS3000 Media Proxy)<\/a><ul><li><a href=\"#\ud83d\udcca-critical-sip-parameters\">\ud83d\udcca Critical SIP Parameters<\/a><\/li><li><a href=\"#\u2699\ufe0f-nat-keep-alive-configuration\">\u2699\ufe0f NAT Keep-Alive Configuration<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd10-authentication-parameters\">\ud83d\udd10 Authentication Parameters (VOS3000 Media Proxy)<\/a><ul><li><a href=\"#\ud83d\udcca-authentication-security-parameters\">\ud83d\udcca Authentication Security Parameters<\/a><\/li><li><a href=\"#\u2699\ufe0f-authentication-lockout-configuration\">\u2699\ufe0f Authentication Lockout Configuration<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-session-timer-configuration\">\ud83d\udcca Session Timer Configuration<\/a><ul><li><a href=\"#\u2699\ufe0f-session-timer-parameters\">\u2699\ufe0f Session Timer Parameters (VOS3000 Media Proxy)<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83c\udfaf-h-323-parameters-reference\">\ud83c\udfaf H.323 Parameters Reference<\/a><ul><li><a href=\"#\ud83d\udcca-critical-h-323-parameters\">\ud83d\udcca Critical H.323 Parameters<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcc8-quality-of-service-qo-s-parameters\">\ud83d\udcc8 Quality of Service (QoS) Parameters<\/a><ul><li><a href=\"#\u2699\ufe0f-qo-s-configuration\">\u2699\ufe0f QoS Configuration<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-billing-and-cdr-parameters\">\ud83d\udcca Billing and CDR Parameters<\/a><ul><li><a href=\"#\u2699\ufe0f-critical-billing-parameters\">\u2699\ufe0f Critical Billing Parameters<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udd17-related-resources\">\ud83d\udd17 Related Resources (VOS3000 Media Proxy)<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#should-i-set-media-proxy-to-on-or-auto\">Should I set media proxy to On or Auto?<\/a><\/li><li><a href=\"#how-do-i-know-if-my-rtp-port-range-is-sufficient\">How do I know if my RTP port range is sufficient?<\/a><\/li><li><a href=\"#why-do-calls-drop-at-30-seconds\">Why do calls drop at 30 seconds?<\/a><\/li><li><a href=\"#what-is-the-best-authentication-retry-setting\">What is the best authentication retry setting?<\/a><\/li><li><a href=\"#how-do-i-troubleshoot-media-proxy-issues\">How do I troubleshoot media proxy issues?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-get-expert-help-with-vos-3000-configuration\">\ud83d\udcde Get Expert Help with VOS3000 Configuration<\/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\udce1-understanding-media-proxy-in-vos-3000\">\ud83d\udce1 Understanding Media Proxy in VOS3000<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Media proxy determines whether RTP (Real-time Transport Protocol) voice packets flow directly between endpoints or through the VOS3000 server. This decision has significant implications for NAT traversal, audio quality, server resource usage, and call reliability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-media-proxy-modes\">\ud83d\udcca vos3000 Media Proxy Modes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The SS_MEDIAPROXYMODE parameter controls media proxy behavior with four distinct modes:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Mode<\/th><th class=\"has-text-align-left\" data-align=\"left\">Behavior<\/th><th class=\"has-text-align-left\" data-align=\"left\">Server Load<\/th><th class=\"has-text-align-left\" data-align=\"left\">Best Use Case<\/th><\/tr><\/thead><tbody><tr><td><strong>Off<\/strong><\/td><td>Never proxy media; RTP flows directly between endpoints<\/td><td>Lowest<\/td><td>Public IP endpoints, no NAT issues<\/td><\/tr><tr><td><strong>On<\/strong><\/td><td>Always proxy all media through server<\/td><td>Highest<\/td><td>Troubleshooting, maximum control<\/td><\/tr><tr><td><strong>Auto<\/strong><\/td><td>Intelligent decision based on conditions<\/td><td>Variable<\/td><td>Mixed environments, recommended<\/td><\/tr><tr><td><strong>Must On<\/strong><\/td><td>Forced proxy regardless of other settings<\/td><td>Highest<\/td><td>Specific debugging scenarios only<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-media-proxy-auto-mode-decision-logic\">\u2699\ufe0f Media Proxy Auto Mode Decision Logic (VOS3000 Media Proxy)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When SS_MEDIAPROXYMODE is set to &#8220;Auto,&#8221; VOS3000 follows a precise decision algorithm to determine whether media proxy is needed:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Media Proxy Decision Steps (Auto Mode):\n\nStep 1: Check if caller or callee MUST have media proxy\n        \u251c\u2500\u2500 If gateway\/phone has Media Proxy = Must On\n        \u2514\u2500\u2500 Result: ENABLE media proxy\n\nStep 2: Check if caller or callee has Media Proxy disabled\n        \u251c\u2500\u2500 If gateway\/phone has Media Proxy = Off\n        \u2514\u2500\u2500 Result: DISABLE media proxy\n\nStep 3: Check if caller or callee has Media Proxy enabled\n        \u251c\u2500\u2500 If gateway\/phone has Media Proxy = On\n        \u2514\u2500\u2500 Result: ENABLE media proxy\n\nStep 4: Check if callee has local ring enabled\n        \u251c\u2500\u2500 Local ring requires media proxy for ringback tone\n        \u2514\u2500\u2500 Result: ENABLE media proxy\n\nStep 5: Check for dynamic registration with encryption\n        \u251c\u2500\u2500 If phone\/gateway uses dynamic register AND encryption\n        \u2514\u2500\u2500 Result: ENABLE media proxy\n\nStep 6: Check cross-network routing (SS_MEDIAPROXYBETWEENNET)\n        \u251c\u2500\u2500 If caller and callee from different networks\n        \u2514\u2500\u2500 Result: ENABLE media proxy\n\nStep 7: Check NAT conditions (SS_MEDIAPROXYBEHINDNAT)\n        \u251c\u2500\u2500 If phone and gateway in same NAT, SS_MEDIAPROXYSAMENAT = On\n        \u251c\u2500\u2500 If phone and gateway in different NAT, one in private network\n        \u2514\u2500\u2500 Result: ENABLE media proxy\n\nStep 8: Default action\n        \u2514\u2500\u2500 Result: DISABLE media proxy\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd27-configuring-media-proxy-parameters\">\ud83d\udd27 Configuring VOS3000 Media Proxy Parameters <\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udccd-location-in-vos-3000-client\">\ud83d\udccd Location in VOS3000 Client<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">Navigation Path:\nOperation Management \u2192 Softswitch Management \u2192 Additional Settings \u2192 System Parameter\n\nParameter Name: SS_MEDIAPROXYMODE\nValid Values: Off, On, Auto, Must On\nDefault Value: Auto\n\nRelated Parameters:\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\u2510\n\u2502 Parameter Name                  \u2502 Description               \u2502\n\u251c\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\u2524\n\u2502 SS_MEDIAPROXYBETWEENNET        \u2502 Proxy for cross-network   \u2502\n\u2502 SS_MEDIAPROXYBEHINDNAT         \u2502 Proxy for behind-NAT      \u2502\n\u2502 SS_MEDIAPROXYSAMENAT           \u2502 Proxy for same-NAT        \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\u2518\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udce1-rtp-port-configuration\">\ud83d\udce1 RTP Port Configuration (VOS3000 Media Proxy)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RTP port configuration determines which UDP ports VOS3000 uses for voice media streams. Proper configuration is essential for firewall rules and capacity planning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-rtp-port-parameters\">\ud83d\udcca RTP Port Parameters<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Default Value<\/th><th class=\"has-text-align-left\" data-align=\"left\">Description<\/th><\/tr><\/thead><tbody><tr><td><strong>SS_RTP_PORT_RANGE<\/strong><\/td><td>10000,39999<\/td><td>UDP port range for RTP media streams<\/td><\/tr><tr><td><strong>SS_H245_PORT_RANGE<\/strong><\/td><td>10000,39999<\/td><td>H.245 port range for H.323 calls<\/td><\/tr><tr><td><strong>IVR_RTP_PORT<\/strong><\/td><td>40000,47999<\/td><td>RTP port range for IVR services<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-rtp-port-sizing-calculation\">\u2699\ufe0f RTP Port Sizing Calculation<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">RTP Port Capacity Planning:\n\nEach concurrent call uses 2 RTP ports (one for each direction)\nPort Range: 10000-39999 = 30,000 ports\nMaximum Concurrent Calls = 30,000 \/ 2 = 15,000 calls\n\nHowever, consider:\n- Each port allocation has overhead\n- IVR services need separate port range\n- H.323 calls share same range\n\nRecommended Configuration by Capacity:\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\u2510\n\u2502 Expected Capacity \u2502 RTP Port Range    \u2502 IVR Port Range      \u2502\n\u251c\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\u2524\n\u2502 Small (&lt;500 CC)   \u2502 10000-19999       \u2502 40000-40999         \u2502\n\u2502 Medium (500-2000) \u2502 10000-29999       \u2502 40000-41999         \u2502\n\u2502 Large (2000-5000) \u2502 10000-39999       \u2502 40000-44999         \u2502\n\u2502 Enterprise (5000+)\u2502 10000-59999       \u2502 60000-64999         \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\u2518\n\nFirewall Rule Example:\niptables -A INPUT -p udp --dport 10000:39999 -j ACCEPT\niptables -A INPUT -p udp --dport 40000:47999 -j ACCEPT\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd11-sip-parameters-reference\">\ud83d\udd11 SIP Parameters Reference (VOS3000 Media Proxy)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SIP parameters control how VOS3000 handles SIP signaling, authentication, and session management. These parameters directly impact call setup success and session reliability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-critical-sip-parameters\">\ud83d\udcca Critical SIP Parameters<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><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\">Purpose<\/th><\/tr><\/thead><tbody><tr><td><strong>SS_SIP_NAT_KEEP_ALIVE_MESSAGE<\/strong><\/td><td>HELLO<\/td><td>Content of NAT keep-alive message<\/td><\/tr><tr><td><strong>SS_SIP_NAT_KEEP_ALIVE_PERIOD<\/strong><\/td><td>30<\/td><td>Keep-alive interval in seconds (10-86400)<\/td><\/tr><tr><td><strong>SS_SIP_NAT_KEEP_ALIVE_SEND_INTERVAL<\/strong><\/td><td>500<\/td><td>Interval between sending keep-alives (ms)<\/td><\/tr><tr><td><strong>SS_SIP_NAT_KEEP_ALIVE_SEND_ONE_TIME<\/strong><\/td><td>3000<\/td><td>Number of keep-alives sent per batch<\/td><\/tr><tr><td><strong>SS_SIP_SESSION_TTL<\/strong><\/td><td>1800<\/td><td>Session Timer TTL in seconds<\/td><\/tr><tr><td><strong>SS_SIP_SESSION_UPDATE_SEGMENT<\/strong><\/td><td>300<\/td><td>Session update interval in seconds<\/td><\/tr><tr><td><strong>SS_SIP_RESEND_INTERVAL<\/strong><\/td><td>0.5,1,2,4,4,4,4,4,4,4<\/td><td>SIP message resend intervals (seconds)<\/td><\/tr><tr><td><strong>SS_SIP_NO_TIMER_REINVITE_INTERVAL<\/strong><\/td><td>7200<\/td><td>Max call time for non-timer SIP clients<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-nat-keep-alive-configuration\">\u2699\ufe0f NAT Keep-Alive Configuration<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">NAT Keep-Alive Purpose:\n- Maintains NAT binding for devices behind NAT\n- Prevents one-way audio caused by expired bindings\n- Essential for devices that don't support SIP Timer\n\nHow It Works:\n1. VOS3000 sends UDP message to registered device IP\n2. Message content = SS_SIP_NAT_KEEP_ALIVE_MESSAGE (default: \"HELLO\")\n3. Sent every SS_SIP_NAT_KEEP_ALIVE_PERIOD seconds (default: 30)\n4. This keeps the NAT mapping active\n\nConfiguration Example:\nSS_SIP_NAT_KEEP_ALIVE_MESSAGE = \"HELLO\"\nSS_SIP_NAT_KEEP_ALIVE_PERIOD = 30\nSS_SIP_NAT_KEEP_ALIVE_SEND_INTERVAL = 500\nSS_SIP_NAT_KEEP_ALIVE_SEND_ONE_TIME = 3000\n\nThis means:\n- Send \"HELLO\" to each device every 30 seconds\n- Wait 500ms between sending to different devices\n- Process 3000 devices in each batch\n\nScaling Notes:\n- 3000 devices \u00d7 500ms = 25 minutes to process all\n- Adjust SEND_ONE_TIME for large deployments\n- Increase SEND_INTERVAL if network is slow\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd10-authentication-parameters\">\ud83d\udd10 Authentication Parameters (VOS3000 Media Proxy)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Authentication parameters control how VOS3000 handles SIP authentication challenges and account lockout policies for security.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-authentication-security-parameters\">\ud83d\udcca Authentication Security Parameters<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><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\">Purpose<\/th><\/tr><\/thead><tbody><tr><td><strong>SS_AUTHENTICATION_MAX_RETRY<\/strong><\/td><td>6<\/td><td>Max auth retries before suspension (0-999)<\/td><\/tr><tr><td><strong>SS_AUTHENTICATION_FAILED_SUSPEND<\/strong><\/td><td>180<\/td><td>Suspension duration in seconds (60-3600)<\/td><\/tr><tr><td><strong>SS_SIP_AUTHENTICATION_CODE<\/strong><\/td><td>Unauthorized(401)<\/td><td>SIP response code for auth challenge<\/td><\/tr><tr><td><strong>SS_SIP_AUTHENTICATION_TIMEOUT<\/strong><\/td><td>10<\/td><td>Timeout for SIP authentication in seconds<\/td><\/tr><tr><td><strong>SS_SIP_AUTHENTICATION_RETRY<\/strong><\/td><td>6<\/td><td>SIP auth retry count for 401\/407 responses<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-authentication-lockout-configuration\">\u2699\ufe0f Authentication Lockout Configuration<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">Security Configuration Example:\n\nFor High-Security Environments:\nSS_AUTHENTICATION_MAX_RETRY = 3\nSS_AUTHENTICATION_FAILED_SUSPEND = 300\n\nFor Standard Environments:\nSS_AUTHENTICATION_MAX_RETRY = 6\nSS_AUTHENTICATION_FAILED_SUSPEND = 180\n\nFor Relaxed Environments (trusted networks only):\nSS_AUTHENTICATION_MAX_RETRY = 10\nSS_AUTHENTICATION_FAILED_SUSPEND = 60\n\nHow Lockout Works:\n1. Device attempts registration with wrong password\n2. VOS3000 returns 401 Unauthorized\n3. Device retries (up to SS_AUTHENTICATION_MAX_RETRY times)\n4. After max retries, IP is added to temporary block list\n5. Block lasts for SS_AUTHENTICATION_FAILED_SUSPEND seconds\n6. After timeout, device can retry\n\nThis protects against:\n- Brute force password attacks\n- SIP flood attacks\n- Credential guessing\n- Automated hacking tools\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-session-timer-configuration\">\ud83d\udcca Session Timer Configuration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Session timers ensure that hung calls are detected and cleaned up, preventing &#8220;ghost calls&#8221; and billing errors.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-session-timer-parameters\">\u2699\ufe0f Session Timer Parameters (VOS3000 Media Proxy)<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">Session Timer Configuration:\n\nSS_SIP_SESSION_TTL = 1800 (30 minutes)\nSS_SIP_SESSION_UPDATE_SEGMENT = 300 (5 minutes)\nSS_SIP_NO_TIMER_REINVITE_INTERVAL = 7200 (2 hours)\n\nHow SIP Session Timer Works:\n1. During call setup, session timer is negotiated\n2. VOS3000 sends UPDATE or re-INVITE at interval\n3. If no response, session is considered dead\n4. Call is terminated and CDR is generated\n\nFor Non-Timer-Capable Clients:\n- SS_SIP_NO_TIMER_REINVITE_INTERVAL sets max call time\n- After this duration, call is terminated\n- Prevents ultra-long \"zombie\" calls\n\nRecommended Values:\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\u2510\n\u2502 Scenario           \u2502 TTL  \u2502 Update Segment \u2502 Max No-Timer \u2502\n\u251c\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\u2524\n\u2502 Standard VoIP      \u2502 1800 \u2502 300            \u2502 7200         \u2502\n\u2502 High-Volume Trunk  \u2502 3600 \u2502 600            \u2502 14400        \u2502\n\u2502 Calling Card       \u2502 900  \u2502 180            \u2502 3600         \u2502\n\u2502 Enterprise PBX     \u2502 1800 \u2502 300            \u2502 28800        \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\u2518\n\nSession Timer Benefits:\n- Detects hung calls automatically\n- Prevents billing discrepancies\n- Reduces \"ghost call\" complaints\n- Frees system resources\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83c\udfaf-h-323-parameters-reference\">\ud83c\udfaf H.323 Parameters Reference<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For environments using H.323 protocol, VOS3000 provides comprehensive parameter controls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83d\udcca-critical-h-323-parameters\">\ud83d\udcca Critical H.323 Parameters<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><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\">Purpose<\/th><\/tr><\/thead><tbody><tr><td><strong>SS_H245_PORT_RANGE<\/strong><\/td><td>10000,39999<\/td><td>Port range for H.245 control channel<\/td><\/tr><tr><td><strong>SS_H323_DTMF_METHOD<\/strong><\/td><td>H.245 alphanumeric<\/td><td>Default DTMF transmission method<\/td><\/tr><tr><td><strong>SS_H323_TIMEOUT_ALERTING<\/strong><\/td><td>120<\/td><td>Timeout for alerting state (seconds)<\/td><\/tr><tr><td><strong>SS_H323_TIMEOUT_CALLPROCEEDING<\/strong><\/td><td>20<\/td><td>Timeout for call proceeding (seconds)<\/td><\/tr><tr><td><strong>SS_H323_TIMEOUT_SETUP<\/strong><\/td><td>5<\/td><td>Timeout for call setup (seconds)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcc8-quality-of-service-qo-s-parameters\">\ud83d\udcc8 Quality of Service (QoS) Parameters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">QoS parameters control the DSCP marking on IP packets for prioritization in managed networks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-qo-s-configuration\">\u2699\ufe0f QoS Configuration<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">QoS Parameters:\n\nSS_QOS_SIGNAL = 0xa0 (default)\n- DSCP marking for SIP\/H.323 signaling packets\n- Hex value applied to IP header ToS field\n\nSS_QOS_RTP = 0xa0 (default)\n- DSCP marking for RTP media packets\n- Hex value applied to IP header ToS field\n\nDSCP Value Reference:\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\u2510\n\u2502 Hex Value \u2502 Binary  \u2502 DSCP Class        \u2502 Description      \u2502\n\u251c\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\u2524\n\u2502 0x00      \u2502 000000  \u2502 Best Effort       \u2502 Default, no QoS  \u2502\n\u2502 0x20      \u2502 001000  \u2502 CS1               \u2502 Scavenger        \u2502\n\u2502 0x40      \u2502 010000  \u2502 CS2               \u2502 OAM              \u2502\n\u2502 0x60      \u2502 011000  \u2502 CS3               \u2502 Signaling        \u2502\n\u2502 0x80      \u2502 100000  \u2502 CS4               \u2502 Real-time        \u2502\n\u2502 0xa0      \u2502 101000  \u2502 CS5 \/ EF          \u2502 Voice (default)  \u2502\n\u2502 0xc0      \u2502 110000  \u2502 CS6               \u2502 Network control  \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\u2518\n\nWhen to Configure:\n- Only in managed networks with QoS policies\n- Coordinate with network team on DSCP values\n- Match router\/switch QoS configuration\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-billing-and-cdr-parameters\">\ud83d\udcca Billing and CDR Parameters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These parameters control billing precision and CDR generation behavior.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2699\ufe0f-critical-billing-parameters\">\u2699\ufe0f Critical Billing Parameters<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><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\">Purpose<\/th><\/tr><\/thead><tbody><tr><td><strong>SERVER_BILLING_HOLD_TIME_PRECISION<\/strong><\/td><td>50<\/td><td>Billing time precision in milliseconds<\/td><\/tr><tr><td><strong>SERVER_MAX_CDR_PENDING_LIST_LENGTH<\/strong><\/td><td>100000<\/td><td>Max pending CDR queue length<\/td><\/tr><tr><td><strong>SERVER_CDR_FILE_WRITE_MAX<\/strong><\/td><td>2048<\/td><td>Max CDR files to retain<\/td><\/tr><tr><td><strong>SERVER_CDR_FILE_WRITE_INTERVAL<\/strong><\/td><td>60<\/td><td>CDR file write interval (seconds)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd17-related-resources\">\ud83d\udd17 Related Resources (VOS3000 Media Proxy)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcd6 <a href=\"https:\/\/multahost.com\/blog\/vos3000-extended-firewall\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 Extended Firewall Configuration<\/a><\/li>\n\n\n\n<li>\ud83d\udcd6 <a href=\"https:\/\/multahost.com\/blog\/vos3000-dialer-call-test-no-voice-one-way-audio-vos3000-pin-call-no-audio\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 One-Way Audio Troubleshooting<\/a><\/li>\n\n\n\n<li>\ud83d\udcd6 <a href=\"https:\/\/multahost.com\/blog\/vos3000-server-configuration-choosevos3000-os-choose\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 Server Configuration Guide<\/a><\/li>\n\n\n\n<li>\ud83d\udcd6 <a href=\"https:\/\/multahost.com\/blog\/vos3000-softswitch-faq-based-on-official-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 FAQ Based on Official Manual<\/a><\/li>\n\n\n\n<li>\ud83d\udcd6 <a href=\"https:\/\/vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 Downloads<\/a><\/li>\n<\/ul>\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=\"should-i-set-media-proxy-to-on-or-auto\">Should I set media proxy to On or Auto?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Auto mode is recommended for most deployments. It intelligently enables media proxy only when needed (NAT traversal, encryption, cross-network calls) while allowing direct RTP when possible. This provides the best balance of reliability and server resource usage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-i-know-if-my-rtp-port-range-is-sufficient\">How do I know if my RTP port range is sufficient?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Calculate: Each concurrent call uses 2 RTP ports. With default range 10000-39999 (30,000 ports), you can support 15,000 concurrent calls. Monitor port usage through system performance monitoring. If you see port allocation errors, increase the range or reduce concurrent call load.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"why-do-calls-drop-at-30-seconds\">Why do calls drop at 30 seconds?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This typically indicates SIP session timer or NAT binding issues. Check SS_SIP_SESSION_TTL and ensure NAT keep-alive is configured. The 30-second timeout often corresponds to NAT binding expiry when keep-alives are not working.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-best-authentication-retry-setting\">What is the best authentication retry setting?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For most environments, the default of 6 retries with 180-second suspension works well. For high-security environments, reduce to 3 retries with longer suspension (300+ seconds). Balance security against false positives from legitimate users mistyping passwords.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-i-troubleshoot-media-proxy-issues\">How do I troubleshoot media proxy issues?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use Debug Trace in VOS3000 to capture SIP and SDP messages. Check if media proxy is being invoked (look at the c= line in SDP). Verify that RTP ports are within configured range. Check firewall rules allow both signaling and RTP ports.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-get-expert-help-with-vos-3000-configuration\">\ud83d\udcde Get Expert Help with VOS3000 Configuration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Need assistance optimizing VOS3000 parameters for your specific deployment? Our team provides professional VOS3000 installation, configuration, and performance tuning services.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udcf1 WhatsApp: <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noreferrer noopener\">+8801911119966<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contact us for VOS3000 server hosting, parameter optimization, and professional support services!<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcf1 <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a><br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.vos3000.com\">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\" style=\"\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/03\/VOS3000-API-problemas-VOS3000-LCR-Least-Cost-Routing-VOS3000-Backup-MySQL-Spanish-Banner-4-1024x683.png\" alt=\"VOS3000 API problemas, VOS3000 LCR Least Cost Routing, VOS3000 Backup MySQL, Negocio VoIP Mayorista, VICIDIAL Servidor, Softswitch Barato, VoIP\u6279\u53d1\u4e1a\u52a1, \u8f6f\u4ea4\u6362\u6bd4\u8f83, Advance Routing, VOS3000 Troubleshooting Guide, VOS3000 CDR Analysis, Gu\u00eda Completa VOS3000 2026, VOS3000 \u6307\u5357 2026, SIP ALG Problems, VOS3000 gateway configuration, VoIP Fraud Prevention, VOS3000 Media Proxy, VOS3000 Call Termination Reasons\"><\/td><td><img decoding=\"async\" style=\"\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/03\/VOS3000-API-problemas-VOS3000-LCR-Least-Cost-Routing-VOS3000-Backup-MySQL-Spanish-Banner-4-1024x683.png\" alt=\"VOS3000 API problemas, VOS3000 LCR Least Cost Routing, VOS3000 Backup MySQL, Negocio VoIP Mayorista, VICIDIAL Servidor, Softswitch Barato, VoIP\u6279\u53d1\u4e1a\u52a1, \u8f6f\u4ea4\u6362\u6bd4\u8f83, Advance Routing, VOS3000 Troubleshooting Guide, VOS3000 CDR Analysis, Gu\u00eda Completa VOS3000 2026, VOS3000 \u6307\u5357 2026, SIP ALG Problems, VOS3000 gateway configuration, VoIP Fraud Prevention, VOS3000 Media Proxy, VOS3000 Call Termination Reasons\"><\/td><td><img decoding=\"async\" style=\"\" src=\"https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/03\/VOS3000-API-problemas-VOS3000-LCR-Least-Cost-Routing-VOS3000-Backup-MySQL-Spanish-Banner-4-1024x683.png\" alt=\"VOS3000 API problemas, VOS3000 LCR Least Cost Routing, VOS3000 Backup MySQL, Negocio VoIP Mayorista, VICIDIAL Servidor, Softswitch Barato, VoIP\u6279\u53d1\u4e1a\u52a1, \u8f6f\u4ea4\u6362\u6bd4\u8f83, Advance Routing, VOS3000 Troubleshooting Guide, VOS3000 CDR Analysis, Gu\u00eda Completa VOS3000 2026, VOS3000 \u6307\u5357 2026, SIP ALG Problems, VOS3000 gateway configuration, VoIP Fraud Prevention, VOS3000 Media Proxy, VOS3000 Call Termination Reasons\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Complete VOS3000 media proxy and system parameters configuration guide. Learn RTP port settings, SIP parameters, NAT traversal configuration, and performance tuning.<\/p>\n","protected":false},"author":1,"featured_media":896,"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":[2],"tags":[3762,3631,3752,3750,3765,3743,3746,3747,3757,3756,3737,3758,3761,3739,3740,3741,3759,3767,3753,3749,3742,222,3754,1913,3763,3755,3751,3732,3088,3738,2991,240,876,3733,3748,3745,2121,3736,3764,3744,1182,3734,1147,3735,1223,3766,3760],"class_list":["post-908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000","tag-media-relay-server","tag-rtp-proxy-configuration","tag-server_billing_hold_time_precision","tag-server_cdr_file_write","tag-sip-alg-vos3000","tag-ss_authentication_max_retry","tag-ss_endpoint_expire","tag-ss_gateway_quality_reserve_time","tag-ss_h245_port_range","tag-ss_h323_dtmf_method","tag-ss_mediaproxymode","tag-ss_qos_rtp","tag-ss_qos_signal","tag-ss_rtp_port_range","tag-ss_sip_nat_keep_alive","tag-ss_sip_session_timeout","tag-ss_virtual_ips","tag-voip-media-proxy","tag-vos3000-acd-monitoring","tag-vos3000-asr-calculation","tag-vos3000-authentication-parameters","tag-vos3000-billing-precision","tag-vos3000-cdr-parameters","tag-vos3000-configuration-guide","tag-vos3000-dmz-settings","tag-vos3000-dtmf-settings","tag-vos3000-h-245-port","tag-vos3000-h-323-parameters","tag-vos3000-media-proxy","tag-vos3000-nat-keep-alive","tag-vos3000-nat-traversal","tag-vos3000-performance-optimization","tag-vos3000-performance-tuning","tag-vos3000-port-configuration","tag-vos3000-quality-reserve-time","tag-vos3000-registration-expire","tag-vos3000-rtp-configuration","tag-vos3000-rtp-port-range","tag-vos3000-server-tuning","tag-vos3000-session-timer","tag-vos3000-signaling-qos","tag-vos3000-sip-parameters","tag-vos3000-sip-timer","tag-vos3000-softswitch-parameters","tag-vos3000-system-parameters","tag-vos3000-troubleshooting-parameters","tag-vos3000-virtual-ip"],"acf":[],"blog_post_layout_featured_media_urls":{"thumbnail":["https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/03\/SIP-ALG-Problems-VOS3000-gateway-configuration-VoIP-Fraud-Prevention-VOS3000-Media-Proxy-VOS3000-Call-Termination-Reasons-2-150x150.png",150,150,true],"full":["https:\/\/www.vos3000.com\/blog\/wp-content\/uploads\/2026\/03\/SIP-ALG-Problems-VOS3000-gateway-configuration-VoIP-Fraud-Prevention-VOS3000-Media-Proxy-VOS3000-Call-Termination-Reasons-2.png",1536,688,false]},"categories_names":{"2":{"name":"VOS3000`","link":"https:\/\/www.vos3000.com\/blog\/category\/vos3000\/"}},"tags_names":{"3762":{"name":"media relay server","link":"https:\/\/www.vos3000.com\/blog\/tag\/media-relay-server\/"},"3631":{"name":"RTP proxy configuration","link":"https:\/\/www.vos3000.com\/blog\/tag\/rtp-proxy-configuration\/"},"3752":{"name":"SERVER_BILLING_HOLD_TIME_PRECISION","link":"https:\/\/www.vos3000.com\/blog\/tag\/server_billing_hold_time_precision\/"},"3750":{"name":"SERVER_CDR_FILE_WRITE","link":"https:\/\/www.vos3000.com\/blog\/tag\/server_cdr_file_write\/"},"3765":{"name":"SIP ALG 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