{"id":105787,"date":"2025-03-26T15:59:26","date_gmt":"2025-03-26T07:59:26","guid":{"rendered":"https:\/\/version-2.com\/?p=105787"},"modified":"2025-03-17T16:02:01","modified_gmt":"2025-03-17T08:02:01","slug":"3cx-voip-call-detail-records-in-graylog","status":"publish","type":"post","link":"https:\/\/version-2.com\/zh\/2025\/03\/3cx-voip-call-detail-records-in-graylog\/","title":{"rendered":"3CX VoIP Call Detail Records In Graylog"},"content":{"rendered":"\t\t
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<\/p>

Even with the rise of high-speed networks and sophisticated monitoring tools, VoIP Call Data Records (CDR) remain an essential resource for troubleshooting and optimizing bandwidth usage.<\/strong> These records provide a granular view of call quality, latency, jitter, and packet loss\u2014critical factors that directly impact voice performance. While real-time monitoring solutions can detect immediate issues, CDRs offer historical insights that help IT teams pinpoint recurring problems, track trends, and ensure networks are properly provisioned. Whether diagnosing call degradation, planning capacity upgrades, or investigating security anomalies, CDR are still one of the most reliable tools for keeping VoIP systems running smoothly.<\/strong><\/p>

In this blog, we cover the 3CX VoIP PBX and the call data records that are sent to Graylog.<\/p>

Configuring 3CX for CDR Logging<\/h2>

To do this in the 3CX call server, you configure a 3CX CDR<\/a> service as a client, as an active socket, to an IP address on a specific port. What happens inside there is that the logs will be shipped in a comma-delimited format, with the fields you see in their field list.<\/p>

\"3CX <\/picture><\/p>

The field list contains a lot of records. You can choose to eliminate or add the ones you want, but make sure you keep the order the same, because when you start parsing the data, the order is crucial.<\/p>

Field Definitions<\/h3>

If you go to the 3CX website<\/a> under the CDR records section, you\u2019ll find the definition of all the different types of fields, which will help you understand what the data contains.<\/p>

Creating a 3CX CDR Input in Graylog<\/h3>

In Graylog, create a 3CX CDR input, which is simply a plain text TCP connection to port 3000.<\/p>

Grok Pattern for Parsing<\/h3>

Here is a grok pattern called<\/strong>: 3CX_CDR. This pattern follows the order of the fields that appear inside the PBX system. Note, this pattern is tied to the image below for the order of the fields. Modifying the fields in 3CX will require changes to this pattern.<\/p>

%{NUMBER:history_id},(?<call_id>[^,]*),%{TIME:duration},%{TIMESTAMP_ISO8601:time_start},%{TIMESTAMP_ISO8601:time_answered},%{TIMESTAMP_ISO8601:time_end},%{WORD:reason_terminated},(?<from_no>[^,]*),(?<to_no>[^,]*),(?<from_dn>[^,]*),(?<to_dn>[^,]*),(?<dial_no>[^,]*),(?<reason_changed>[^,]*),(?<final_number>[^,]*),(?<final_dn>[^,]*),(?<bill_code>[^,]*),(?<bill_rate>[^,]*),(?<bill_cost>[^,]*),(?<bill_name>[^,]*),(?<chain>[^,]*),(?<from_type>[^,]*),(?<to_type>[^,]*),(?<final_type>[^,]*),(?<from_dispname>[^,]*),(?<to_dispname>[^,]*),(?<final_dispname>[^,]*),(?<missed_queue_calls>[^,]*)<\/code><\/pre>
Fields available in order within the PBX System based on this grok pattern: \"3CX <\/picture><\/p>
The Parsing Rule:<\/h3>
rule \"Parse 3CX CDR GROK\"\nWhen\n   true\n       \/\/Route 3CX CDR to Stream old:\nthen\n    let grokp = grok(\n        pattern:\"%{3CX_CDR}\",\n        value:to_string($message.message),\n        only_named_captures: true\n        );\n        \n    set_fields(grokp);\n    set_field(\"grok_parse\",true);\nend<\/code><\/pre>
It\u2019s important that you don\u2019t reorder these fields unless you also go into Graylog and reorder your grok pattern accordingly. Inside the rule, I\u2019ve referenced the pattern so that when the data comes in, it automatically parses out the records.<\/p>
Additional Parsing of the Timestamp.<\/h3>
rule \"Parse - 3cx - End Call TimeStamp Breakout\"\nWhen\n    $message.grok_parse == true\nthen\n    let grokp = grok(\n        pattern:\"%{TIMESTAMP_ISO8601}\",\n        value:to_string($message.time_end),\n        only_named_captures: false\n        );\n        \n    set_fields(fields:grokp,prefix:\"TimeEnd_\");\n    set_field(\"grok_parse_timeend_timestamp\",true);\n    remove_field(\"TimeEnd_TIMESTAMP_ISO8601\");\n    remove_field(\"TimeEnd_MINUTE\");\n    remove_field(\"TimeEnd_SECOND\");\nend<\/code><\/pre>
<\/picture><\/h2>
Graylog for Telecom<\/h2>
VoIP Call Data Records (CDRs) may not be the flashiest tool in a network administrator\u2019s arsenal, but they remain one of the most reliable. From diagnosing call quality issues to optimizing bandwidth on your network and uncovering security threats, CDR provide the historical insights needed to keep VoIP systems running smoothly. While real-time monitoring has its place, a solid understanding of CDR data ensures that recurring problems don\u2019t go unnoticed and that networks are properly scaled for future demand. In short, if you\u2019re not leveraging CDR in your VoIP troubleshooting process, you\u2019re missing a critical piece of the puzzle. Try Graylog<\/a> and and get those VoIP logs and watch this Video<\/a>!<\/p>
See the next blog on the 3CX attack detected by Graylog here called \u201cDetecting the 3CX Supply Chain Attack with Graylog and Sigma Rules<\/a>\u201c<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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About Graylog\u00a0\u00a0<\/strong>
At Graylog, our vision is a secure digital world where organizations of all sizes can effectively guard against cyber threats. We\u2019re committed to turning this vision into reality by providing Threat Detection & Response that sets the standard for excellence. Our cloud-native architecture delivers SIEM, API Security, and Enterprise Log Management solutions that are not just efficient and effective\u2014whether hosted by us, on-premises, or in your cloud\u2014but also deliver a fantastic Analyst Experience at the lowest total cost of ownership. We aim to equip security analysts with the best tools for the job, empowering every organization to stand resilient in the ever-evolving cybersecurity landscape.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\t\t
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About Version 2 Digital<\/h3>
Version 2 Digital is one of the most dynamic IT companies in Asia. The company distributes a wide range of IT products across various areas including cyber security, cloud, data protection, end points, infrastructures, system monitoring, storage, networking, business productivity and communication products.\n

\nThrough an extensive network of channels, point of sales, resellers, and partnership companies, Version 2 offers quality products and services which are highly acclaimed in the market. Its customers cover a wide spectrum which include Global 1000 enterprises, regional listed companies, different vertical industries, public utilities, Government, a vast number of successful SMEs, and consumers in various Asian cities.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"
Even with the rise of high-speed networks and sophistic […]<\/p>\n","protected":false},"author":149011790,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1303,1305,61],"tags":[1077,1304],"class_list":["post-105787","post","type-post","status-publish","format-standard","hentry","category-graylog","category-1305","category-press-release","tag-1077","tag-graylog"],"acf":[],"yoast_head":"\n3CX VoIP Call Detail Records In Graylog - Version 2<\/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:\/\/graylog.org\/post\/3cx-voip-call-detail-records-in-graylog\/\" \/>\n<meta property=\"og:locale\" content=\"zh_HK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3CX VoIP Call Detail Records In Graylog - 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