{"id":147,"date":"2020-09-01T12:36:22","date_gmt":"2020-09-01T12:36:22","guid":{"rendered":"http:\/\/knowledge.webafrica.co.za\/?post_type=ht_kb&#038;p=147"},"modified":"2026-04-21T12:28:12","modified_gmt":"2026-04-21T12:28:12","slug":"one-way-audio-and-or-number-not-available","status":"publish","type":"ht_kb","link":"https:\/\/knowledge.webafrica.co.za\/index.php\/knowledge-base\/one-way-audio-and-or-number-not-available\/","title":{"rendered":"One-Way Audio or \u201cNumber Not Available\u201d"},"content":{"rendered":"\n<p>If you can make calls but audio is missing, or you\u2019re getting a \u201cnumber not available\u201d message, here\u2019s what to check.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What You Might Be Experiencing<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You can hear the other person, but they can\u2019t hear you<\/li>\n\n\n\n<li>They can hear you, but you can\u2019t hear them<\/li>\n\n\n\n<li>Calls connect, but there\u2019s silence<\/li>\n\n\n\n<li>You get a \u201cnumber not available\u201d message<\/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\">Quick Checks First<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Restart Everything<\/h3>\n\n\n\n<p>Switch off:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Router<\/li>\n\n\n\n<li>VoIP device<\/li>\n<\/ul>\n\n\n\n<p>Switch back on:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Router<\/li>\n\n\n\n<li>VoIP device<\/li>\n<\/ol>\n\n\n\n<p>Give it a minute before testing again.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Check Your Internet<\/h3>\n\n\n\n<p>VoIP depends on a stable connection.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If your internet is slow or dropping, calls will fail or lose audio<\/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\">Fixing One-Way Audio<\/h2>\n\n\n\n<p>This is almost always a network issue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Most Common Cause: Router \/ NAT \/ Firewall<\/h3>\n\n\n\n<p>Your router may be blocking part of the voice traffic.<\/p>\n\n\n\n<p><strong>Quick test:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use a softphone (Zoiper \/ GS Wave) on mobile data<\/li>\n\n\n\n<li>If it works there \u2192 your router is the problem<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">What You Can Do<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restart your router<\/li>\n\n\n\n<li>Disable SIP ALG in router settings (if available)<\/li>\n\n\n\n<li>Avoid double NAT setups (router behind another router)<\/li>\n<\/ul>\n\n\n\n<p>If you\u2019re not comfortable changing settings, log a support request.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Device or Codec Issue<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect codec settings can break audio<\/li>\n\n\n\n<li>Reset or reconfigure your VoIP device if needed<\/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\">Fixing \u201cNumber Not Available\u201d<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Check the Number Format<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Always dial the full number<\/li>\n\n\n\n<li>Include area code (e.g. 021, 011)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Test Other Numbers<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If all numbers fail \u2192 likely configuration issue<\/li>\n\n\n\n<li>If only some fail \u2192 likely routing issue<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Routing Issue (Provider Side)<\/h3>\n\n\n\n<p>Sometimes the route to a specific network fails.<\/p>\n\n\n\n<p>\ud83d\udc49 Provide support with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The number you called<\/li>\n\n\n\n<li>Date and time<\/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\">Still Not Working?<\/h2>\n\n\n\n<p>Have this ready before contacting support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your VoIP number<\/li>\n\n\n\n<li>The number you\u2019re calling<\/li>\n\n\n\n<li>Time of the issue<\/li>\n\n\n\n<li>What exactly happens (silence, error, one-way audio)<\/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\">Straight Talk<\/h2>\n\n\n\n<p>If nothing changed on your side and this suddenly started happening, it\u2019s usually:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Router behaviour<\/li>\n\n\n\n<li>Network routing<\/li>\n\n\n\n<li>Or registration hiccups<\/li>\n<\/ul>\n\n\n\n<p>Not magic. Just VoIP being VoIP.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you can make calls but audio is missing, or you\u2019re getting a \u201cnumber not available\u201d message, here\u2019s what to check. What You Might Be Experiencing Quick Checks First 1. Restart Everything Switch off: Switch back on: Give it a minute before testing again. 2. Check Your Internet VoIP depends&#8230;<\/p>\n","protected":false},"author":1,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[146],"ht-kb-tag":[194,193,192,191,156],"class_list":["post-147","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-voip","ht_kb_tag-audio","ht_kb_tag-caller-cannot-hear-me","ht_kb_tag-cannot-hear-caller","ht_kb_tag-not-ringing","ht_kb_tag-zoiper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>One-Way Audio or \u201cNumber Not Available\u201d - Webafrica Knowledgebase<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/knowledge.webafrica.co.za\/index.php\/knowledge-base\/one-way-audio-and-or-number-not-available\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"One-Way Audio or \u201cNumber Not Available\u201d - Webafrica Knowledgebase\" \/>\n<meta property=\"og:description\" content=\"If you can make calls but audio is missing, or you\u2019re getting a \u201cnumber not available\u201d message, here\u2019s what to check. 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