{"id":3180,"date":"2026-04-21T06:52:41","date_gmt":"2026-04-21T06:52:41","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3180"},"modified":"2026-04-21T07:02:27","modified_gmt":"2026-04-21T07:02:27","slug":"vos3000-sip-response-codes","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-sip-response-codes\/","title":{"rendered":"VOS3000 SIP Response Codes CDR Complete 30-Plus Important Code Reference"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-sip-response-codes-cdr-complete-30-plus-code-reference\">VOS3000 SIP Response Codes CDR Complete 30-Plus Code Reference<\/h1>\n\n\n\n<p>Understanding <strong>VOS3000 SIP response codes CDR<\/strong> data is fundamental for any VoIP operator who needs to diagnose call failures, optimize routing, and maintain high call completion rates. SIP response codes are 3-digit status indicators defined in RFC 3261 that every SIP element generates during call signaling. VOS3000 records the final SIP response code in each CDR, providing a direct view into why calls succeeded or failed at the protocol level. This reference covers all 30+ SIP response codes you will encounter in VOS3000 CDRs, organized by class with troubleshooting guidance for each. Need help analyzing your CDR data? Contact us on WhatsApp: <strong>+8801911119966<\/strong>.<\/p>\n\n\n\n<p>SIP response codes follow a class-based structure where the first digit indicates the response category. VOS3000 CDRs capture the final SIP response that determined the call outcome \u2014 for successful calls this is typically 200 OK, while failed calls record the error response that caused termination. By analyzing the distribution of SIP response codes across your CDR data, you can identify routing problems, capacity issues, and configuration errors that affect your ASR and revenue.<\/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-sip-response-codes-cdr-complete-30-plus-code-reference\">VOS3000 SIP Response Codes CDR Complete 30-Plus Code Reference<\/a><ul><li><a href=\"#sip-response-code-classes-overview\">SIP Response Code Classes Overview<\/a><\/li><li><a href=\"#4-xx-client-error-codes-in-vos-3000-cd-rs\">4xx Client Error Codes in VOS3000 CDRs<\/a><\/li><li><a href=\"#5-xx-server-error-codes-in-vos-3000-cd-rs\">5xx Server Error Codes in VOS3000 CDRs<\/a><\/li><li><a href=\"#6-xx-global-failure-codes\">6xx Global Failure Codes<\/a><\/li><li><a href=\"#sip-response-codes-and-asr-correlation\">SIP Response Codes and ASR Correlation<\/a><\/li><li><a href=\"#related-resources\">Related Resources<\/a><\/li><li><a href=\"#frequently-asked-questions-about-vos-3000-sip-response-codes-cdr\">Frequently Asked Questions About VOS3000 SIP Response Codes CDR<\/a><ul><li><a href=\"#what-sip-response-code-indicates-a-successful-call-in-vos-3000\">What SIP response code indicates a successful call in VOS3000?<\/a><\/li><li><a href=\"#what-does-sip-503-service-unavailable-mean-in-my-cd-rs\">What does SIP 503 Service Unavailable mean in my CDRs?<\/a><\/li><li><a href=\"#how-do-i-reduce-408-request-timeout-errors\">How do I reduce 408 Request Timeout errors?<\/a><\/li><li><a href=\"#why-am-i-seeing-403-forbidden-in-my-h-323-gateway-cd-rs\">Why am I seeing 403 Forbidden in my H.323 gateway CDRs?<\/a><\/li><li><a href=\"#what-is-the-difference-between-486-busy-and-600-busy-everywhere\">What is the difference between 486 Busy and 600 Busy Everywhere?<\/a><\/li><li><a href=\"#can-i-change-how-vos-3000-handles-specific-sip-response-codes\">Can I change how VOS3000 handles specific SIP response codes?<\/a><\/li><\/ul><\/li><li><a href=\"#get-expert-vos-3000-cdr-analysis-support\">Get Expert VOS3000 CDR Analysis Support<\/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=\"sip-response-code-classes-overview\">SIP Response Code Classes Overview<\/h2>\n\n\n\n<p>The six SIP response code classes each represent a different category of signaling outcome. Understanding the class structure is the first step in interpreting VOS3000 SIP response codes CDR data efficiently.<\/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\">Class<\/th><th class=\"has-text-align-left\" data-align=\"left\">Category<\/th><th class=\"has-text-align-left\" data-align=\"left\">Meaning<\/th><th class=\"has-text-align-left\" data-align=\"left\">CDR Impact<\/th><\/tr><tr><td>1xx<\/td><td>Provisional<\/td><td>Call in progress, not final<\/td><td>Rarely recorded as final CDR code<\/td><\/tr><tr><td>2xx<\/td><td>Success<\/td><td>Call successfully established<\/td><td>Billable call \u2014 200 OK most common<\/td><\/tr><tr><td>3xx<\/td><td>Redirection<\/td><td>Call redirected to another URI<\/td><td>May or may not result in billable call<\/td><\/tr><tr><td>4xx<\/td><td>Client Error<\/td><td>Request failed due to client issue<\/td><td>Non-billable \u2014 configuration or routing problem<\/td><\/tr><tr><td>5xx<\/td><td>Server Error<\/td><td>Server failed to fulfill request<\/td><td>Non-billable \u2014 upstream or capacity issue<\/td><\/tr><tr><td>6xx<\/td><td>Global Failure<\/td><td>Call rejected at all locations<\/td><td>Non-billable \u2014 should stop failover<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-xx-client-error-codes-in-vos-3000-cd-rs\">4xx Client Error Codes in VOS3000 CDRs<\/h2>\n\n\n\n<p>4xx response codes indicate that the request contained bad syntax or could not be fulfilled at the client side. These are the most actionable codes because they often point to configuration problems that operators can fix directly.<\/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\">Code<\/th><th class=\"has-text-align-left\" data-align=\"left\">Name<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common Cause in VOS3000<\/th><th class=\"has-text-align-left\" data-align=\"left\">Resolution<\/th><\/tr><tr><td>400<\/td><td>Bad Request<\/td><td>Malformed SIP message from VOS3000<\/td><td>Check SIP header settings and dial plan<\/td><\/tr><tr><td>401<\/td><td>Unauthorized<\/td><td>Authentication credential mismatch<\/td><td>Verify username\/password on gateway<\/td><\/tr><tr><td>403<\/td><td>Forbidden<\/td><td>IP not authorized, account blocked<\/td><td>Check IP whitelist, account status<\/td><\/tr><tr><td>404<\/td><td>Not Found<\/td><td>Dialed number not routable<\/td><td>Add prefix to routing table<\/td><\/tr><tr><td>407<\/td><td>Proxy Auth Required<\/td><td>Outbound proxy requires authentication<\/td><td>Configure proxy auth credentials<\/td><\/tr><tr><td>408<\/td><td>Request Timeout<\/td><td>No response from gateway within timeout<\/td><td>Check gateway availability and network<\/td><\/tr><tr><td>480<\/td><td>Temporarily Unavailable<\/td><td>Callee offline or DND active<\/td><td>Check callee registration status<\/td><\/tr><tr><td>486<\/td><td>Busy Here<\/td><td>Callee line is busy<\/td><td>Normal \u2014 enable busy stop switch<\/td><\/tr><tr><td>487<\/td><td>Request Terminated<\/td><td>Call cancelled by originator<\/td><td>Check for early hangup or timeout<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"5-xx-server-error-codes-in-vos-3000-cd-rs\">5xx Server Error Codes in VOS3000 CDRs<\/h2>\n\n\n\n<p>5xx codes indicate that the server side failed to process the request. These are often outside your direct control but understanding them helps identify which upstream carriers are experiencing problems. For more on failover behavior, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-routing\/\">VOS3000 call routing guide<\/a>.<\/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\">Code<\/th><th class=\"has-text-align-left\" data-align=\"left\">Name<\/th><th class=\"has-text-align-left\" data-align=\"left\">Meaning<\/th><th class=\"has-text-align-left\" data-align=\"left\">Action<\/th><\/tr><tr><td>500<\/td><td>Server Internal Error<\/td><td>Gateway encountered unexpected error<\/td><td>Contact gateway vendor or check logs<\/td><\/tr><tr><td>502<\/td><td>Bad Gateway<\/td><td>Upstream gateway returned invalid response<\/td><td>Check upstream gateway health<\/td><\/tr><tr><td>503<\/td><td>Service Unavailable<\/td><td>Gateway overloaded or in maintenance<\/td><td>Route to alternate gateway<\/td><\/tr><tr><td>504<\/td><td>Server Timeout<\/td><td>No response from upstream server<\/td><td>Check network path to upstream<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"6-xx-global-failure-codes\">6xx Global Failure Codes<\/h2>\n\n\n\n<p>6xx response codes are global failures that indicate the call should not be retried at any other location. When VOS3000 receives a 6xx response, it should stop failover switching and record the code in the CDR. Understanding these codes helps prevent unnecessary gateway switching. For failover configuration, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-routing-optimization\/\">VOS3000 routing optimization guide<\/a>. For assistance, message us on WhatsApp: <strong>+8801911119966<\/strong>.<\/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\">Code<\/th><th class=\"has-text-align-left\" data-align=\"left\">Name<\/th><th class=\"has-text-align-left\" data-align=\"left\">Meaning<\/th><th class=\"has-text-align-left\" data-align=\"left\">Failover Behavior<\/th><\/tr><tr><td>600<\/td><td>Busy Everywhere<\/td><td>All locations report busy<\/td><td>Stop switching<\/td><\/tr><tr><td>603<\/td><td>Decline<\/td><td>Call explicitly rejected<\/td><td>Stop switching<\/td><\/tr><tr><td>604<\/td><td>Does Not Exist Anywhere<\/td><td>Number does not exist globally<\/td><td>Stop switching<\/td><\/tr><tr><td>606<\/td><td>Not Acceptable<\/td><td>Session description not acceptable<\/td><td>Check codec negotiation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sip-response-codes-and-asr-correlation\">SIP Response Codes and ASR Correlation<\/h2>\n\n\n\n<p>Analyzing VOS3000 SIP response codes CDR data alongside ASR metrics reveals which response codes are dragging down your call completion rates. A healthy deployment should show 200 OK dominating the CDR distribution, with error codes representing a small percentage of total calls.<\/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\">Response Code Distribution<\/th><th class=\"has-text-align-left\" data-align=\"left\">Healthy ASR<\/th><th class=\"has-text-align-left\" data-align=\"left\">Degraded ASR<\/th><\/tr><tr><td>200 OK<\/td><td>Above 70%<\/td><td>Below 50%<\/td><\/tr><tr><td>4xx errors total<\/td><td>Below 15%<\/td><td>Above 30%<\/td><\/tr><tr><td>5xx errors total<\/td><td>Below 10%<\/td><td>Above 20%<\/td><\/tr><tr><td>486 Busy<\/td><td>Below 10%<\/td><td>Above 20%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"related-resources\">Related Resources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-call-routing\/\">VOS3000 Call Routing Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-routing-optimization\/\">VOS3000 Routing Optimization<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-authentication\/\">VOS3000 SIP Authentication<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc3261\" target=\"_blank\" rel=\"noopener\">RFC 3261 &#8211; SIP Protocol Specification<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions-about-vos-3000-sip-response-codes-cdr\">Frequently Asked Questions About VOS3000 SIP Response Codes CDR<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-sip-response-code-indicates-a-successful-call-in-vos-3000\">What SIP response code indicates a successful call in VOS3000?<\/h3>\n\n\n\n<p>In VOS3000 CDRs, a SIP 200 OK response code indicates that the call was successfully established and answered. This is the standard success response defined in RFC 3261 that confirms the INVITE was accepted and a media session was established. All calls with 200 OK as the final response are typically billable (assuming they have non-zero duration), and a high percentage of 200 OK responses relative to total calls indicates healthy ASR performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-does-sip-503-service-unavailable-mean-in-my-cd-rs\">What does SIP 503 Service Unavailable mean in my CDRs?<\/h3>\n\n\n\n<p>SIP 503 Service Unavailable in VOS3000 CDRs means the terminating gateway or server is currently unable to handle the call due to overload, maintenance, or capacity constraints. This is one of the most impactful error codes because it directly reduces ASR and often triggers gateway failover. If 503 responses are frequent from a specific gateway, that gateway may be under-provisioned or experiencing issues. You can use the Replace Failed Reason feature to change how VOS3000 handles 503 responses for failover decisions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-i-reduce-408-request-timeout-errors\">How do I reduce 408 Request Timeout errors?<\/h3>\n\n\n\n<p>SIP 408 Request Timeout errors indicate that VOS3000 sent an INVITE but did not receive a response within the configured timeout period. To reduce these errors, first verify that the destination gateway is online and reachable. Then check network connectivity and latency between VOS3000 and the gateway. You can also adjust the INVITE timeout settings in the softswitch parameters, but increasing timeouts too much will raise PDD for all calls. Also check whether the gateway is silently dropping packets due to firewall or NAT issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"why-am-i-seeing-403-forbidden-in-my-h-323-gateway-cd-rs\">Why am I seeing 403 Forbidden in my H.323 gateway CDRs?<\/h3>\n\n\n\n<p>SIP 403 Forbidden appears when VOS3000 rejects the call because the source IP address is not authorized, the account is disabled, or a specific policy prevents the call. In the context of H.323-to-SIP translation, this code may appear when VOS3000 sends the call to a SIP gateway that does not recognize the originating credentials. Check the mapping gateway authentication settings, verify that the source IP is in the allowed list, and confirm that the account is active and not suspended.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-difference-between-486-busy-and-600-busy-everywhere\">What is the difference between 486 Busy and 600 Busy Everywhere?<\/h3>\n\n\n\n<p>SIP 486 Busy Here means a specific endpoint or gateway reported busy, but other locations might still accept the call \u2014 VOS3000 can continue failover to alternate gateways. SIP 600 Busy Everywhere is a global failure indicating that all known locations for the called number are busy, and VOS3000 should stop trying alternate routes. The key difference is failover behavior: 486 allows continued switching (unless busy stop switch is enabled), while 600 always terminates the call attempt.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-i-change-how-vos-3000-handles-specific-sip-response-codes\">Can I change how VOS3000 handles specific SIP response codes?<\/h3>\n\n\n\n<p>Yes, VOS3000 provides the Replace Failed Reason feature in mapping gateway settings that allows you to override how specific SIP response codes are handled. For example, you can change a 503 Service Unavailable to a 486 Busy Here to prevent aggressive failover that wastes CPS capacity. This feature is configured per mapping gateway and affects both routing behavior and the response code recorded in the CDR. See our <a href=\"https:\/\/multahost.com\/blog\/vos3000-termination-reason-error-code-replacement-to-alternative-codes-like-service-unavailable\/\">termination reason replacement guide<\/a> for details.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"get-expert-vos-3000-cdr-analysis-support\">Get Expert VOS3000 CDR Analysis Support<\/h2>\n\n\n\n<p>Interpreting VOS3000 SIP response codes CDR data correctly is the key to identifying and resolving call quality issues quickly. Our VOS3000 specialists can help you build systematic CDR analysis workflows, set up automated alerting for problematic response code patterns, and optimize your routing configurations to maximize ASR.<\/p>\n\n\n\n<p><strong>Contact us on WhatsApp: +8801911119966<\/strong><\/p>\n\n\n\n<p>From CDR analysis to routing optimization and gateway troubleshooting, we provide comprehensive VOS3000 support. Reach out today at <strong>+8801911119966<\/strong> and take control of your call quality metrics.<\/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>For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/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\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-LRN-Number-Portability-VOS3000-LRN-Server-Configuration-VOS3000-Server-Side-End-Reasons-VOS3000-H323-Q850-Cause-Codes-VOS3000-SIP-Response-Codes-CDR-3.png?resize=809%2C540\" alt=\"VOS3000 LRN Number Portability, VOS3000 LRN Server Configuration, VOS3000 Server-Side End Reasons, VOS3000 H323 Q850 Cause Codes, VOS3000 SIP Response Codes CDR\" title=\"\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-LRN-Number-Portability-VOS3000-LRN-Server-Configuration-VOS3000-Server-Side-End-Reasons-VOS3000-H323-Q850-Cause-Codes-VOS3000-SIP-Response-Codes-CDR-3.png?resize=809%2C540\" alt=\"VOS3000 LRN Number Portability, VOS3000 LRN Server Configuration, VOS3000 Server-Side End Reasons, VOS3000 H323 Q850 Cause Codes, VOS3000 SIP Response Codes CDR\" title=\"\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-LRN-Number-Portability-VOS3000-LRN-Server-Configuration-VOS3000-Server-Side-End-Reasons-VOS3000-H323-Q850-Cause-Codes-VOS3000-SIP-Response-Codes-CDR-3.png?resize=809%2C540\" alt=\"VOS3000 LRN Number Portability, VOS3000 LRN Server Configuration, VOS3000 Server-Side End Reasons, VOS3000 H323 Q850 Cause Codes, VOS3000 SIP Response Codes CDR\" title=\"\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>VOS3000 SIP response codes CDR reference with 30+ codes. Understand 1xx through 6xx SIP responses in CDRs for troubleshooting, quality analysis, and 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