{"id":3182,"date":"2026-04-21T06:52:54","date_gmt":"2026-04-21T06:52:54","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3182"},"modified":"2026-04-21T07:04:34","modified_gmt":"2026-04-21T07:04:34","slug":"vos3000-server-end-reasons","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-server-end-reasons\/","title":{"rendered":"VOS3000 Server End Reasons Definitive Important 25-Code Reference Guide"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-server-end-reasons-definitive-25-code-reference-guide\">VOS3000 Server End Reasons Definitive 25-Code Reference Guide<\/h1>\n\n\n\n<p>Understanding <strong>VOS3000 server end reasons<\/strong> is essential for any VoIP operator who needs to diagnose call failures, resolve billing disputes, and improve overall network quality. VOS3000 records 25 distinct server-side end reason codes in its CDRs, each representing a different cause for call termination as observed from the softswitch perspective. These codes go beyond simple SIP response codes or Q.850 cause values \u2014 they represent the VOS3000 internal decision for why a call ended, providing the most granular insight into call lifecycle events. Need help analyzing your CDRs? Contact us on WhatsApp: <strong>+8801911119966<\/strong>.<\/p>\n\n\n\n<p>Unlike SIP response codes (which are protocol-level) or Q.850 cause codes (which are network-level), VOS3000 server end reasons are application-level codes generated by the softswitch itself. They capture scenarios that are unique to the VOS3000 platform, such as billing-related terminations, route selection failures, and account management events. By analyzing these codes across your CDR data, you can identify systemic issues affecting ASR, pinpoint billing discrepancies, and understand exactly why calls fail at the softswitch level.<\/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-server-end-reasons-definitive-25-code-reference-guide\">VOS3000 Server End Reasons Definitive 25-Code Reference Guide<\/a><ul><li><a href=\"#complete-vos-3000-server-end-reasons-code-table\">Complete VOS3000 Server End Reasons Code Table<\/a><\/li><li><a href=\"#end-reason-categories-and-severity-classification\">End Reason Categories and Severity Classification<\/a><\/li><li><a href=\"#common-end-reasons-and-their-troubleshooting-steps\">Common End Reasons and Their Troubleshooting Steps<\/a><\/li><li><a href=\"#end-reasons-and-billing-impact-analysis\">End Reasons and Billing Impact Analysis<\/a><\/li><li><a href=\"#how-end-reasons-map-to-sip-and-h-323-codes\">How End Reasons Map to SIP and H.323 Codes<\/a><\/li><li><a href=\"#related-resources\">Related Resources<\/a><\/li><li><a href=\"#frequently-asked-questions-about-vos-3000-server-end-reasons\">Frequently Asked Questions About VOS3000 Server End Reasons<\/a><ul><li><a href=\"#what-are-vos-3000-server-end-reasons\">What are VOS3000 server end reasons?<\/a><\/li><li><a href=\"#how-do-server-end-reasons-differ-from-sip-response-codes\">How do server end reasons differ from SIP response codes?<\/a><\/li><li><a href=\"#which-end-reasons-indicate-billing-problems\">Which end reasons indicate billing problems?<\/a><\/li><li><a href=\"#how-can-i-analyze-end-reasons-across-my-cdr-data\">How can I analyze end reasons across my CDR data?<\/a><\/li><li><a href=\"#what-does-server-forced-release-code-13-mean\">What does Server Forced Release (code 13) mean?<\/a><\/li><li><a href=\"#are-all-25-end-reason-codes-used-in-both-sip-and-h-323-calls\">Are all 25 end reason codes used in both SIP and H.323 calls?<\/a><\/li><\/ul><\/li><li><a href=\"#need-expert-vos-3000-cdr-analysis\">Need Expert VOS3000 CDR Analysis?<\/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=\"complete-vos-3000-server-end-reasons-code-table\">Complete VOS3000 Server End Reasons Code Table<\/h2>\n\n\n\n<p>The following table lists all 25 VOS3000 server-side end reason codes as documented in \u00a74.5 of the administration manual. Each code has a specific meaning that maps to an internal VOS3000 decision point in the call processing pipeline.<\/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\">End Reason<\/th><th class=\"has-text-align-left\" data-align=\"left\">Category<\/th><\/tr><tr><td>1<\/td><td>Normal Clearing<\/td><td>Normal<\/td><\/tr><tr><td>2<\/td><td>User Busy<\/td><td>Normal<\/td><\/tr><tr><td>3<\/td><td>No Answer<\/td><td>Normal<\/td><\/tr><tr><td>4<\/td><td>Unallocated Number<\/td><td>Number Error<\/td><\/tr><tr><td>5<\/td><td>Network Congestion<\/td><td>Network<\/td><\/tr><tr><td>6<\/td><td>Route Not Found<\/td><td>Routing<\/td><\/tr><tr><td>7<\/td><td>Rate Not Found<\/td><td>Billing<\/td><\/tr><tr><td>8<\/td><td>Balance Insufficient<\/td><td>Billing<\/td><\/tr><tr><td>9<\/td><td>Account Expired<\/td><td>Account<\/td><\/tr><tr><td>10<\/td><td>Account Disabled<\/td><td>Account<\/td><\/tr><tr><td>11<\/td><td>Caller Hangup<\/td><td>Normal<\/td><\/tr><tr><td>12<\/td><td>Callee Hangup<\/td><td>Normal<\/td><\/tr><tr><td>13<\/td><td>Server Forced Release<\/td><td>System<\/td><\/tr><tr><td>14<\/td><td>Session Timeout<\/td><td>Timeout<\/td><\/tr><tr><td>15<\/td><td>Media Timeout<\/td><td>Timeout<\/td><\/tr><tr><td>16<\/td><td>Authentication Failed<\/td><td>Security<\/td><\/tr><tr><td>17<\/td><td>Unauthorized IP<\/td><td>Security<\/td><\/tr><tr><td>18<\/td><td>Concurrent Limit Exceeded<\/td><td>Capacity<\/td><\/tr><tr><td>19<\/td><td>CPS Limit Exceeded<\/td><td>Capacity<\/td><\/tr><tr><td>20<\/td><td>Blacklist Match<\/td><td>Security<\/td><\/tr><tr><td>21<\/td><td>Gateway Unavailable<\/td><td>Routing<\/td><\/tr><tr><td>22<\/td><td>No Available Route<\/td><td>Routing<\/td><\/tr><tr><td>23<\/td><td>Call Rejected<\/td><td>Network<\/td><\/tr><tr><td>24<\/td><td>Prepaid Duration Exceeded<\/td><td>Billing<\/td><\/tr><tr><td>25<\/td><td>Service Not Subscribed<\/td><td>Account<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"end-reason-categories-and-severity-classification\">End Reason Categories and Severity Classification<\/h2>\n\n\n\n<p>The 25 VOS3000 server end reasons can be grouped into six functional categories. Understanding these categories helps operators quickly identify whether call failures are due to billing issues, routing problems, security blocks, or normal call completion events. For more on how these codes affect your quality metrics, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-asr-acd-analysis\/\">VOS3000 ASR ACD analysis 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\">Category<\/th><th class=\"has-text-align-left\" data-align=\"left\">Codes<\/th><th class=\"has-text-align-left\" data-align=\"left\">Impact Level<\/th><th class=\"has-text-align-left\" data-align=\"left\">Action Required<\/th><\/tr><tr><td>Normal<\/td><td>1, 2, 3, 11, 12<\/td><td>Low<\/td><td>No action needed<\/td><\/tr><tr><td>Routing<\/td><td>6, 21, 22<\/td><td>High<\/td><td>Check rate table and gateway config<\/td><\/tr><tr><td>Billing<\/td><td>7, 8, 24<\/td><td>High<\/td><td>Review rates and account balances<\/td><\/tr><tr><td>Account<\/td><td>9, 10, 25<\/td><td>Medium<\/td><td>Verify account status and subscriptions<\/td><\/tr><tr><td>Security<\/td><td>16, 17, 20<\/td><td>Critical<\/td><td>Investigate unauthorized access attempts<\/td><\/tr><tr><td>Capacity\/Timeout<\/td><td>5, 14, 15, 18, 19<\/td><td>Medium-High<\/td><td>Scale resources or adjust limits<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"common-end-reasons-and-their-troubleshooting-steps\">Common End Reasons and Their Troubleshooting Steps<\/h2>\n\n\n\n<p>The most frequently encountered VOS3000 server end reasons in production environments typically fall into a handful of codes. Understanding what each means and how to address it is critical for maintaining healthy ASR and ACD metrics. For detailed SIP-level troubleshooting, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-debug-guide\/\">VOS3000 SIP debug 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\">End Reason<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common Cause<\/th><th class=\"has-text-align-left\" data-align=\"left\">Resolution<\/th><\/tr><tr><td>6<\/td><td>Route Not Found<\/td><td>No matching prefix in route table<\/td><td>Add prefix to routing configuration<\/td><\/tr><tr><td>7<\/td><td>Rate Not Found<\/td><td>Dialed prefix not in rate table<\/td><td>Add rate entry for missing prefix<\/td><\/tr><tr><td>8<\/td><td>Balance Insufficient<\/td><td>Prepaid account depleted<\/td><td>Recharge account balance<\/td><\/tr><tr><td>22<\/td><td>No Available Route<\/td><td>All gateways busy or offline<\/td><td>Add more gateways or check existing<\/td><\/tr><tr><td>15<\/td><td>Media Timeout<\/td><td>No RTP received after call setup<\/td><td>Check NAT\/firewall, media proxy settings<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"end-reasons-and-billing-impact-analysis\">End Reasons and Billing Impact Analysis<\/h2>\n\n\n\n<p>Certain VOS3000 server end reasons directly affect billing calculations. Code 8 (Balance Insufficient) and Code 24 (Prepaid Duration Exceeded) are billing-driven terminations initiated by the VOS3000 billing engine. Code 7 (Rate Not Found) means the call was never rated and generates no revenue. Understanding which end reasons produce billable vs non-billable CDRs is essential for revenue assurance. For more on billing configurations, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">VOS3000 billing system 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\">End Reason<\/th><th class=\"has-text-align-left\" data-align=\"left\">CDR Generated<\/th><th class=\"has-text-align-left\" data-align=\"left\">Billable<\/th><th class=\"has-text-align-left\" data-align=\"left\">Billing Mode Code<\/th><\/tr><tr><td>Normal Clearing (1)<\/td><td>Yes<\/td><td>Yes<\/td><td>0 or 1<\/td><\/tr><tr><td>Rate Not Found (7)<\/td><td>Yes<\/td><td>No<\/td><td>-1<\/td><\/tr><tr><td>Balance Insufficient (8)<\/td><td>Yes<\/td><td>No<\/td><td>-1<\/td><\/tr><tr><td>Prepaid Duration Exceeded (24)<\/td><td>Yes<\/td><td>Yes (partial)<\/td><td>1<\/td><\/tr><tr><td>Route Not Found (6)<\/td><td>Yes<\/td><td>No<\/td><td>-1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-end-reasons-map-to-sip-and-h-323-codes\">How End Reasons Map to SIP and H.323 Codes<\/h2>\n\n\n\n<p>VOS3000 server end reasons are internal to the platform, but they often have corresponding SIP response codes or Q.850 cause codes in the signaling layer. Understanding these mappings helps correlate CDR end reasons with protocol-level traces captured by tools like Wireshark or tcpdump. For protocol-level analysis, 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\">Server End Reason<\/th><th class=\"has-text-align-left\" data-align=\"left\">SIP Response<\/th><th class=\"has-text-align-left\" data-align=\"left\">Q.850 Cause<\/th><\/tr><tr><td>Normal Clearing<\/td><td>200 OK (BYE)<\/td><td>16<\/td><\/tr><tr><td>User Busy<\/td><td>486 Busy Here<\/td><td>17<\/td><\/tr><tr><td>No Answer<\/td><td>408 Request Timeout<\/td><td>18 or 19<\/td><\/tr><tr><td>Route Not Found<\/td><td>404 Not Found<\/td><td>1 or 3<\/td><\/tr><tr><td>Balance Insufficient<\/td><td>403 Forbidden<\/td><td>21<\/td><\/tr><tr><td>Network Congestion<\/td><td>503 Service Unavailable<\/td><td>42<\/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-asr-acd-analysis\/\">VOS3000 ASR ACD Analysis<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-billing-system\/\">VOS3000 Billing System Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/multahost.com\/blog\/vos3000-sip-debug-guide\/\">VOS3000 SIP Debug Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc3261\" target=\"_blank\" rel=\"noopener\">RFC 3261 &#8211; SIP: Session Initiation Protocol<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions-about-vos-3000-server-end-reasons\">Frequently Asked Questions About VOS3000 Server End Reasons<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-are-vos-3000-server-end-reasons\">What are VOS3000 server end reasons?<\/h3>\n\n\n\n<p>VOS3000 server end reasons are 25 internal codes that the softswitch records in CDRs to indicate why a call was terminated from the server&#8217;s perspective. These codes cover normal call completion (like user hangup and normal clearing), routing failures (like route not found and no available route), billing issues (like balance insufficient and rate not found), security events (like authentication failed and unauthorized IP), and system-level terminations (like server forced release and session timeout). They are documented in \u00a74.5 of the VOS3000 administration manual.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-server-end-reasons-differ-from-sip-response-codes\">How do server end reasons differ from SIP response codes?<\/h3>\n\n\n\n<p>VOS3000 server end reasons are application-level codes generated by the softswitch itself, while SIP response codes are protocol-level status indicators defined in RFC 3261. A single SIP response code like 503 Service Unavailable could map to multiple VOS3000 end reasons depending on the internal context \u2014 it could be Network Congestion (code 5), No Available Route (code 22), or Gateway Unavailable (code 21). Server end reasons provide more granular insight into the VOS3000 internal decision process than SIP codes alone.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"which-end-reasons-indicate-billing-problems\">Which end reasons indicate billing problems?<\/h3>\n\n\n\n<p>The primary billing-related end reasons are Code 7 (Rate Not Found \u2014 no matching rate entry), Code 8 (Balance Insufficient \u2014 prepaid account depleted), and Code 24 (Prepaid Duration Exceeded \u2014 call ended because maximum allowed duration was reached). These codes directly indicate that billing engine decisions terminated the call. High volumes of code 7 suggest missing rate table entries, while high code 8 volumes indicate accounts running out of balance frequently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-can-i-analyze-end-reasons-across-my-cdr-data\">How can I analyze end reasons across my CDR data?<\/h3>\n\n\n\n<p>You can analyze VOS3000 server end reasons by querying the CDR database and grouping records by end reason code. This reveals the distribution of call termination causes and helps identify systemic issues. For example, if code 22 (No Available Route) dominates, you need more gateway capacity. If code 7 (Rate Not Found) is frequent, you have gaps in your rate tables. Use the VOS3000 CDR query tools or export CDRs to an external analytics platform for detailed analysis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-does-server-forced-release-code-13-mean\">What does Server Forced Release (code 13) mean?<\/h3>\n\n\n\n<p>Code 13 (Server Forced Release) indicates that the VOS3000 softswitch actively terminated the call for an internal reason, such as a system-level resource constraint, administrative intervention, or a forced disconnect triggered by a monitoring rule. Unlike timeout-based terminations, Server Forced Release is an active decision by the softswitch to end the call. Investigating the system logs around the time of the CDR can reveal the specific trigger for the forced release.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"are-all-25-end-reason-codes-used-in-both-sip-and-h-323-calls\">Are all 25 end reason codes used in both SIP and H.323 calls?<\/h3>\n\n\n\n<p>Yes, the 25 VOS3000 server end reason codes are protocol-independent and apply to both SIP and H.323 calls. The same internal end reason code is recorded in the CDR regardless of the signaling protocol used. However, the corresponding protocol-level codes differ \u2014 a SIP call with end reason 2 (User Busy) will show 486 Busy Here in the SIP layer, while an H.323 call with the same end reason will show Q.850 cause code 17. The server end reason provides a unified view across both protocols.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"need-expert-vos-3000-cdr-analysis\">Need Expert VOS3000 CDR Analysis?<\/h2>\n\n\n\n<p>Analyzing VOS3000 server end reasons across millions of CDRs requires both technical expertise and the right analytical approach. Our VOS3000 specialists can help you build CDR analysis workflows, identify the root causes of call failures, and optimize your routing and billing configurations to improve ASR and reduce revenue leakage.<\/p>\n\n\n\n<p><strong>Contact us on WhatsApp: +8801911119966<\/strong><\/p>\n\n\n\n<p>Whether you need help interpreting end reason distributions, troubleshooting high failure rates, or building automated CDR monitoring dashboards, our team is here to assist. Reach out today at <strong>+8801911119966<\/strong> and take control of your VOS3000 call quality.<\/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=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" 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=\"\" class=\"lazyload\" data-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\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" 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=\"\" class=\"lazyload\" data-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\"><\/td><td><img data-recalc-dims=\"1\" height=\"540\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" 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=\"\" class=\"lazyload\" data-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\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>VOS3000 server end reasons reference with all 25 codes. Understand call termination causes in CDRs for troubleshooting, billing disputes, and quality 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