{"id":2544,"date":"2026-09-23T10:04:40","date_gmt":"2026-09-23T07:04:40","guid":{"rendered":"https:\/\/zvonex.com\/?p=2544"},"modified":"2026-09-23T10:04:40","modified_gmt":"2026-09-23T07:04:40","slug":"voip-troubleshooting-5-most-common-problems-and-how-to-fix-them","status":"publish","type":"post","link":"https:\/\/zvonex.com\/en\/voip-troubleshooting-5-most-common-problems-and-how-to-fix-them\/","title":{"rendered":"VoIP Troubleshooting: 5 Most Common Problems and How to Fix Them"},"content":{"rendered":"<p>Most VoIP problems fall into a small number of categories. If you can diagnose quickly, you spend less time in downtime and more time on calls.<\/p>\n<ol>\n<li>One-sided audio (you can hear them, they can&#039;t hear you \u2014 or vice versa)<\/li>\n<\/ol>\n<p>Almost always a NAT traversal issue. Your router isn&#039;t forwarding SIP and RTP ports correctly. Solution: enable STUN on your SIP client, or configure your router to forward ports 5060 (SIP) and 10000\u201320000 (RTP) to your PBX.<\/p>\n<ol>\n<li>Echo on calls<\/li>\n<\/ol>\n<p>Usually caused by acoustic echo (mic picking up speaker sound) or electrical echo (impedance mismatch in the audio path). Solutions: use a headset instead of speakerphone, enable echo cancellation on your PBX, reduce microphone sensitivity.<\/p>\n<ol>\n<li>Choppy or robotic audio<\/li>\n<\/ol>\n<p>This is a jitter and packet loss problem. Your network is dropping or reordering audio packets. Solutions: enable QoS on your router to prioritize VoIP traffic, reduce network congestion, check for packet loss with a ping test. Loss above 1% will affect call quality noticeably.<\/p>\n<ol>\n<li>Calls dropping after exactly 30 or 60 seconds<\/li>\n<\/ol>\n<p>Almost always a SIP timeout issue \u2014 your firewall is closing the SIP session thinking the connection is idle. Solution: enable SIP ALG on your router (or disable it \u2014 depending on the router, either can cause this), or set SIP keep-alive intervals.<\/p>\n<ol>\n<li>Can&#039;t receive incoming calls<\/li>\n<\/ol>\n<p>Usually a firewall or port forwarding issue preventing inbound SIP from reaching your system. Solution: confirm your SIP provider&#039;s IP ranges are whitelisted on your firewall.<\/p>\n<p>\u2192 zvonex.com<\/p>\n<p>\ud83d\udce9 t.me\/zvonex_support<\/p>\n\n<!-- pa-seo-links:start -->\n<p class=\"pa-related-service wp-block-paragraph\"><strong>Learn more about the solution:<\/strong> <a href=\"https:\/\/zvonex.com\/en\/en-business-phone-system\/\">Business Phone Systems<\/a><\/p>\n<!-- pa-seo-links:end -->","protected":false},"excerpt":{"rendered":"<p>Most VoIP problems fall into a small number of categories. If you can diagnose quickly, you spend less time in downtime and more time\u2026<\/p>","protected":false},"author":1,"featured_media":2560,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49,242],"tags":[55,56,165,187,190,54,164,186,188,191,50,303,163,189,302,301,166,181,52,53,51],"pa_topic_cluster":[212],"class_list":["post-2544","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-ip-telephony","category-business-phone","tag-callcenter","tag-forex","tag-business-communication","tag-businesscosts","tag-businessphone","tag-call-center","tag-cloud-telephony","tag-cloudpbx","tag-cloudtelephony","tag-costsavings","tag-ip-telephony","tag-networkadmin","tag-sip-trunking","tag-siptrunk","tag-techsupport","tag-troubleshooting","tag-virtual-numbers","tag-voip","tag-zvonex","tag-zvonex-com","tag-51"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VoIP Troubleshooting: 5 Most Common Problems and How to Fix Them - Zvonex \u2013 IP-\u0442\u0435\u043b\u0435\u0444\u043e\u043d\u0438\u044f \u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0435 \u043d\u043e\u043c\u0435\u0440\u0430 \u0434\u043b\u044f \u0431\u0438\u0437\u043d\u0435\u0441\u0430<\/title>\n<meta name=\"description\" content=\"Most VoIP problems fall into a small number of categories. If you can diagnose quickly, you spend less time in downtime and more time on calls. 1.\u2026\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zvonex.com\/en\/voip-troubleshooting-5-most-common-problems-and-how-to-fix-them\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VoIP Troubleshooting: 5 Most Common Problems and How to Fix Them - Zvonex \u2013 IP-\u0442\u0435\u043b\u0435\u0444\u043e\u043d\u0438\u044f \u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0435 \u043d\u043e\u043c\u0435\u0440\u0430 \u0434\u043b\u044f \u0431\u0438\u0437\u043d\u0435\u0441\u0430\" \/>\n<meta property=\"og:description\" content=\"Most VoIP problems fall into a small number of categories. 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