{"id":1913,"date":"2026-03-14T04:00:18","date_gmt":"2026-03-14T04:00:18","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=1913"},"modified":"2026-03-15T16:40:49","modified_gmt":"2026-03-15T16:40:49","slug":"vos3000-rtp-media","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-rtp-media\/","title":{"rendered":"VOS3000 RTP Media &amp; Audio Troubleshooting \u2013 Easily Fix One Way Audio and No Sound"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-rtp-media-audio-troubleshooting-guide-fix-one-way-audio-and-no-sound\">VOS3000 RTP Media &amp; Audio Troubleshooting Guide \u2013 Fix One Way Audio and No Sound<\/h1>\n\n\n\n<p>Audio problems are one of the most common technical issues in VoIP systems. Operators using the <strong>VOS3000 softswitch<\/strong> sometimes experience problems such as one way audio, no sound after call connection or intermittent voice quality issues.<\/p>\n\n\n\n<p>Most of these problems are related to RTP media flow, NAT configuration, codec negotiation or firewall restrictions.<\/p>\n\n\n\n<p>This guide explains how <strong>RTP media works in VOS3000<\/strong> and how to troubleshoot common audio problems in VoIP deployments.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Most of Time this solved by Try Media Proxy &#8220;On\/Off&#8221; at Routing Gateway, VOS3000 do Signaling &#8211; so mostly one way audio not depend on VOS3000 but still try Media Proxy On\/Off, at least any of that will work for no audio or one way audio.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>\ud83d\udcf1 WhatsApp Support<br><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-rtp-media-audio-troubleshooting-guide-fix-one-way-audio-and-no-sound\">VOS3000 RTP Media &amp; Audio Troubleshooting Guide \u2013 Fix One Way Audio and No Sound<\/a><ul><li><a href=\"#understanding-rtp-media-in-vos-3000\">Understanding RTP Media in VOS3000 (VOS3000 RTP Media)<\/a><\/li><li><a href=\"#common-audio-problems-in-vos-3000\">Common Audio Problems in VOS3000<\/a><\/li><li><a href=\"#one-way-audio-problem\">One Way Audio Problem (VOS3000 RTP Media)<\/a><\/li><li><a href=\"#firewall-blocking-rtp-ports\">Firewall Blocking RTP Ports<\/a><\/li><li><a href=\"#nat-configuration-problems\">NAT Configuration Problems (VOS3000 RTP Media)<\/a><\/li><li><a href=\"#codec-mismatch-issues\">Codec Mismatch Issues (VOS3000 RTP Media)<\/a><\/li><li><a href=\"#gateway-audio-problems\">Gateway Audio Problems<\/a><\/li><li><a href=\"#monitoring-audio-quality\">Monitoring Audio Quality<\/a><\/li><li><a href=\"#best-practices-to-avoid-audio-issues\">Best Practices to Avoid Audio Issues<\/a><\/li><li><a href=\"#official-vos-3000-resources\">Official VOS3000 Resources<\/a><\/li><li><a href=\"#faq-vos-3000-audio-troubleshooting\">FAQ \u2013 VOS3000 Audio Troubleshooting<\/a><ul><li><a href=\"#why-does-one-way-audio-happen-in-vo-ip-calls\">Why does one way audio happen in VoIP calls?<\/a><\/li><li><a href=\"#does-vos-3000-control-rtp-media-directly\">Does VOS3000 control RTP media directly?<\/a><\/li><li><a href=\"#how-can-i-fix-no-audio-after-call-connection\">How can I fix no audio after call connection?<\/a><\/li><li><a href=\"#where-can-i-download-vos-3000-manuals\">Where can I download VOS3000 manuals?<\/a><\/li><\/ul><\/li><li><a href=\"#need-vos-3000-server-or-support\">Need VOS3000 Server or Support?<\/a><\/li><li><a href=\"#\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Call Center Setup Support?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"understanding-rtp-media-in-vos-3000\">Understanding RTP Media in VOS3000 (VOS3000 RTP Media)<\/h2>\n\n\n\n<p>In VoIP communication, SIP protocol is used for signaling while RTP (Real-Time Transport Protocol) carries the actual audio packets.<\/p>\n\n\n\n<p>The call process typically works like this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>SIP signaling establishes the call<\/li>\n\n\n\n<li>Endpoints negotiate codecs<\/li>\n\n\n\n<li>RTP ports are exchanged<\/li>\n\n\n\n<li>Voice packets flow between endpoints<\/li>\n<\/ol>\n\n\n\n<p>Once a call is connected through the VOS3000 routing engine, RTP streams transmit the audio between the caller and the destination network.<\/p>\n\n\n\n<p>Understanding the <strong>VOS3000 SIP call routing process<\/strong> can help diagnose media problems.<\/p>\n\n\n\n<p><a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-call-flow\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 SIP Call Flow Explained<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"common-audio-problems-in-vos-3000\">Common Audio Problems in VOS3000<\/h2>\n\n\n\n<p>VoIP operators frequently encounter several types of audio issues.<\/p>\n\n\n\n<p>The most common problems include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>One way audio<\/li>\n\n\n\n<li>No audio after call connection<\/li>\n\n\n\n<li>Delayed audio packets<\/li>\n\n\n\n<li>Audio dropping during calls<\/li>\n\n\n\n<li>Codec incompatibility<\/li>\n<\/ul>\n\n\n\n<p>These issues usually occur because RTP packets are blocked or misconfigured somewhere in the network path.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"one-way-audio-problem\">One Way Audio Problem (VOS3000 RTP Media)<\/h2>\n\n\n\n<p>One way audio occurs when one side of the call can hear the other party but the reverse direction has no audio.<\/p>\n\n\n\n<p>This usually happens due to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>NAT configuration problems<\/li>\n\n\n\n<li>Firewall blocking RTP ports<\/li>\n\n\n\n<li>Incorrect gateway IP configuration<\/li>\n<\/ul>\n\n\n\n<p>In many VoIP networks, SIP signaling works correctly but RTP packets cannot reach the destination endpoint.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"firewall-blocking-rtp-ports\">Firewall Blocking RTP Ports<\/h2>\n\n\n\n<p>Firewalls can block RTP traffic if the necessary ports are not opened.<\/p>\n\n\n\n<p>Most VoIP deployments require a range of UDP ports for RTP media streams.<\/p>\n\n\n\n<p>If these ports are restricted, the call may connect but no audio will pass between endpoints.<\/p>\n\n\n\n<p>Network administrators should verify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RTP port range configuration<\/li>\n\n\n\n<li>UDP port access rules<\/li>\n\n\n\n<li>firewall NAT behavior<\/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=\"nat-configuration-problems\">NAT Configuration Problems (VOS3000 RTP Media)<\/h2>\n\n\n\n<p>NAT (Network Address Translation) is another major cause of audio problems in VoIP networks.<\/p>\n\n\n\n<p>When devices are located behind routers, the public IP address may differ from the internal address used in SIP signaling.<\/p>\n\n\n\n<p>If NAT traversal is not handled properly, RTP packets may be sent to incorrect IP addresses.<\/p>\n\n\n\n<p>This leads to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>one way audio<\/li>\n\n\n\n<li>delayed voice packets<\/li>\n\n\n\n<li>call disconnection<\/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=\"codec-mismatch-issues\">Codec Mismatch Issues (VOS3000 RTP Media)<\/h2>\n\n\n\n<p>Codec negotiation happens during SIP call setup. If both endpoints cannot agree on a common codec, audio transmission may fail.<\/p>\n\n\n\n<p>Typical codecs used in VoIP networks include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>G711<\/li>\n\n\n\n<li>G729<\/li>\n\n\n\n<li>G723<\/li>\n<\/ul>\n\n\n\n<p>Operators should ensure that the codec configuration is compatible between the originating gateway and the termination carrier.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"gateway-audio-problems\">Gateway Audio Problems<\/h2>\n\n\n\n<p>Sometimes audio problems originate from the gateway or carrier network rather than the VOS3000 server itself.<\/p>\n\n\n\n<p>Possible causes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>carrier codec restrictions<\/li>\n\n\n\n<li>incorrect SIP header formatting<\/li>\n\n\n\n<li>gateway media routing errors<\/li>\n<\/ul>\n\n\n\n<p>Proper gateway configuration and routing policies can help reduce these issues.<\/p>\n\n\n\n<p><a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-trunk-configuration-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 SIP Trunk Configuration Guide<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"monitoring-audio-quality\">Monitoring Audio Quality<\/h2>\n\n\n\n<p>VOS3000 provides monitoring tools that allow operators to evaluate call performance and identify routing problems.<\/p>\n\n\n\n<p>Important quality metrics include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASR \u2013 Answer Seizure Ratio<\/li>\n\n\n\n<li>ACD \u2013 Average Call Duration<\/li>\n\n\n\n<li>Call failure rate<\/li>\n\n\n\n<li>gateway traffic reports<\/li>\n<\/ul>\n\n\n\n<p>Operators can analyze these metrics to determine whether issues originate from routing, carrier networks or local infrastructure.<\/p>\n\n\n\n<p><a href=\"https:\/\/multahost.com\/blog\/vos3000-error-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 Error Codes and Troubleshooting<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"best-practices-to-avoid-audio-issues\">Best Practices to Avoid Audio Issues<\/h2>\n\n\n\n<p>To maintain stable VoIP service, operators should follow several best practices.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Allow RTP UDP ports in firewall rules<\/li>\n\n\n\n<li>verify NAT configuration<\/li>\n\n\n\n<li>ensure compatible codecs between gateways<\/li>\n\n\n\n<li>monitor call quality statistics regularly<\/li>\n\n\n\n<li>test carrier routes frequently<\/li>\n<\/ul>\n\n\n\n<p>Proper network configuration significantly reduces VoIP audio issues.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"official-vos-3000-resources\">Official VOS3000 Resources<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 Official Manuals and Downloads<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/multahost.com\/blog\/vos3000-client-download\/\" target=\"_blank\" rel=\"noreferrer noopener\">VOS3000 Client Software Download<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq-vos-3000-audio-troubleshooting\">FAQ \u2013 VOS3000 Audio Troubleshooting<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"why-does-one-way-audio-happen-in-vo-ip-calls\">Why does one way audio happen in VoIP calls?<\/h3>\n\n\n\n<p>One way audio usually occurs when RTP packets are blocked by firewalls or incorrect NAT configuration.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"does-vos-3000-control-rtp-media-directly\">Does VOS3000 control RTP media directly?<\/h3>\n\n\n\n<p>VOS3000 handles SIP signaling and routing, while RTP media streams normally flow between endpoints or gateways.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-can-i-fix-no-audio-after-call-connection\">How can I fix no audio after call connection?<\/h3>\n\n\n\n<p>Check firewall rules, verify RTP port configuration and ensure that both endpoints support the same codecs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"where-can-i-download-vos-3000-manuals\">Where can I download VOS3000 manuals?<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noreferrer noopener\">Download VOS3000 Manuals<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"need-vos-3000-server-or-support\">Need VOS3000 Server or Support?<\/h2>\n\n\n\n<p>If you need VOS3000 hosting, routing configuration or VoIP deployment assistance, you can contact us.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Call Center Setup Support?<\/h2>\n\n\n\n<p>For professional VOS3000 call center configuration and deployment:<\/p>\n\n\n\n<p>\ud83d\udcf1 <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a><br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.vos3000.com\" target=\"_blank\" rel=\"noopener\">www.vos3000.com<\/a><br>\ud83c\udf10 <strong>Blog:<\/strong> <a href=\"https:\/\/multahost.com\/blog\">multahost.com\/blog<\/a><br>\ud83d\udce5 <strong>Downloads:<\/strong> <a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noopener\">VOS3000 Downloads<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" style=\"\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000-Offer, VOS3000 Price, VOS3000 rent, VOS3000 Hosting, VOS3000 installation, VOS3000 CentOS, VOS3000 Hosted, VOS3000 21907, VOS3000 Web, VOS3000 Softswitch, VOS3000 Keygen, VOS3000 Login, VOS3000 API, VOS3000 Anti Hack, VOS3000 21907, VOS3000 21907 Feature, VOS3000 2.1.6.00, client VOS3000, VOS3000 Server, VOS3000 Gateway, VOS3000 Server getting restarted, VOS3000 Installation, VOS3000 Server, VOS3000 SoftSwitch, VOS3000 Switch, VOS3000, VOS3000 Pricem VOS3000 Web, VOS3000 API, VOS3000 Rent, VOS3000 Manual, VOS3000 Downloads, VOS3000 VoIP, VOS3000 Carrier Switch, VOS3000, VOS3000 Login, VOS3000 Monitoring, VOS3000 Performance Metrics, VOS3000 Call Routing, VOS3000 Security, VOS3000 Web Manager, VOS3000 Versions, VOS3000 BillingVOS3000 Monitoring,VOS3000 Capacity, VOS3000 Billing System, VOS3000 License, Mobile Apps for VOS3000, VOS3000 Mobile Apps, Mobile Apps, VOS3000 Apps, Android VOS3000, VOS3000 in IOS, Manual for VOS3000, VOS3000 Manual, Manual VOS3000, Reference Manual VOS3000, User Manual VOS3000, CentOS7 Installation for VOS3000, Multiple IP License in VOS3000, VOS3000 License, License in VOS3000, vos installation, VOS3000 Hosting, Hosting VOS3000, VOS3000 Server Rent, VOS3000 Client Download, VOS3000 error codes, VOS3000 vs Asterisk, VOS3000 call center, best voip softswitch, vos3000 routing, vos3000 vicidial auto dialer, vos3000 sip trunk configuration, VOS3000 ASR ACD Analysis, VOS3000 Codec G729 Transcoding, VOS3000 IVR Balance Query, VOS3000 DTMF Modes, VOS3000 Gateway Analysis Reports, VOS3000 RTP Media, VOS3000 SIP Call Flow\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/VOS3000-Offer-1024x683.png?resize=809%2C540&#038;ssl=1\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" style=\"\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000-Offer, VOS3000 Price, VOS3000 rent, VOS3000 Hosting, VOS3000 installation, VOS3000 CentOS, VOS3000 Hosted, VOS3000 21907, VOS3000 Web, VOS3000 Softswitch, VOS3000 Keygen, VOS3000 Login, VOS3000 API, VOS3000 Anti Hack, VOS3000 21907, VOS3000 21907 Feature, VOS3000 2.1.6.00, client VOS3000, VOS3000 Server, VOS3000 Gateway, VOS3000 Server getting restarted, VOS3000 Installation, VOS3000 Server, VOS3000 SoftSwitch, VOS3000 Switch, VOS3000, VOS3000 Pricem VOS3000 Web, VOS3000 API, VOS3000 Rent, VOS3000 Manual, VOS3000 Downloads, VOS3000 VoIP, VOS3000 Carrier Switch, VOS3000, VOS3000 Login, VOS3000 Monitoring, VOS3000 Performance Metrics, VOS3000 Call Routing, VOS3000 Security, VOS3000 Web Manager, VOS3000 Versions, VOS3000 BillingVOS3000 Monitoring,VOS3000 Capacity, VOS3000 Billing System, VOS3000 License, Mobile Apps for VOS3000, VOS3000 Mobile Apps, Mobile Apps, VOS3000 Apps, Android VOS3000, VOS3000 in IOS, Manual for VOS3000, VOS3000 Manual, Manual VOS3000, Reference Manual VOS3000, User Manual VOS3000, CentOS7 Installation for VOS3000, Multiple IP License in VOS3000, VOS3000 License, License in VOS3000, vos installation, VOS3000 Hosting, Hosting VOS3000, VOS3000 Server Rent, VOS3000 Client Download, VOS3000 error codes, VOS3000 vs Asterisk, VOS3000 call center, best voip softswitch, vos3000 routing, vos3000 vicidial auto dialer, vos3000 sip trunk configuration, VOS3000 ASR ACD Analysis, VOS3000 Codec G729 Transcoding, VOS3000 IVR Balance Query, VOS3000 DTMF Modes, VOS3000 Gateway Analysis Reports, VOS3000 RTP Media, VOS3000 SIP Call Flow\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/VOS3000-Offer-1024x683.png?resize=809%2C540&#038;ssl=1\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" style=\"\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000-Offer, VOS3000 Price, VOS3000 rent, VOS3000 Hosting, VOS3000 installation, VOS3000 CentOS, VOS3000 Hosted, VOS3000 21907, VOS3000 Web, VOS3000 Softswitch, VOS3000 Keygen, VOS3000 Login, VOS3000 API, VOS3000 Anti Hack, VOS3000 21907, VOS3000 21907 Feature, VOS3000 2.1.6.00, client VOS3000, VOS3000 Server, VOS3000 Gateway, VOS3000 Server getting restarted, VOS3000 Installation, VOS3000 Server, VOS3000 SoftSwitch, VOS3000 Switch, VOS3000, VOS3000 Pricem VOS3000 Web, VOS3000 API, VOS3000 Rent, VOS3000 Manual, VOS3000 Downloads, VOS3000 VoIP, VOS3000 Carrier Switch, VOS3000, VOS3000 Login, VOS3000 Monitoring, VOS3000 Performance Metrics, VOS3000 Call Routing, VOS3000 Security, VOS3000 Web Manager, VOS3000 Versions, VOS3000 BillingVOS3000 Monitoring,VOS3000 Capacity, VOS3000 Billing System, VOS3000 License, Mobile Apps for VOS3000, VOS3000 Mobile Apps, Mobile Apps, VOS3000 Apps, Android VOS3000, VOS3000 in IOS, Manual for VOS3000, VOS3000 Manual, Manual VOS3000, Reference Manual VOS3000, User Manual VOS3000, CentOS7 Installation for VOS3000, Multiple IP License in VOS3000, VOS3000 License, License in VOS3000, vos installation, VOS3000 Hosting, Hosting VOS3000, VOS3000 Server Rent, VOS3000 Client Download, VOS3000 error codes, VOS3000 vs Asterisk, VOS3000 call center, best voip softswitch, vos3000 routing, vos3000 vicidial auto dialer, vos3000 sip trunk configuration, VOS3000 ASR ACD Analysis, VOS3000 Codec G729 Transcoding, VOS3000 IVR Balance Query, VOS3000 DTMF Modes, VOS3000 Gateway Analysis Reports, VOS3000 RTP Media, VOS3000 SIP Call Flow\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2025\/09\/VOS3000-Offer-1024x683.png?resize=809%2C540&#038;ssl=1\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>VOS3000 RTP Media audio troubleshooting guide. Learn how to fix one way audio, RTP media issues, firewall blocking, codec mismatch and gateway audio problems in VOS3000 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