Labs · early, not fully tested. Check what it produces before you rely on it.
{"version":"2026-09-22.3","entries":[{"code":"connected-under-one-second","topicSlug":"cucm-cdr-field-reference","topicTitle":"CUCM CDR and CMR field reference","articleHref":"/knowledge/cucm-cdr-field-reference","askHref":"/?topic=cucm-cdr-field-reference","claims":[{"id":"cucmcdr-duration-is-zero-below-one-second","text":"The duration field is zero both when a call never connects and when it connects for less than one second, so a duration of zero is not evidence that a call was never answered.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-duration-is-zero-below-one-second","sources":[{"id":"cisco-cucm-cdr-field-descriptions-15","title":"Call Reporting and Billing Administration Guide for Cisco Unified Communications Manager Release 15 and SUs, CDR Field Descriptions","publisher":"Cisco Systems, Inc. (Webex Help Center)","tier":2,"tierLabel":"current vendor documentation","locator":"CDR Field Descriptions, duration","href":"/knowledge/sources/cisco-cucm-cdr-field-descriptions-15"}]},{"id":"cucmcdr-duration-is-connect-to-disconnect","text":"The duration field is the difference between the connect time and the disconnect time in seconds and so measures connected time rather than the life of the call.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-duration-is-connect-to-disconnect","sources":[{"id":"cisco-cucm-cdr-field-descriptions-15","title":"Call Reporting and Billing Administration Guide for Cisco Unified Communications Manager Release 15 and SUs, CDR Field Descriptions","publisher":"Cisco Systems, Inc. (Webex Help Center)","tier":2,"tierLabel":"current vendor documentation","locator":"CDR Field Descriptions, duration","href":"/knowledge/sources/cisco-cucm-cdr-field-descriptions-15"}]},{"id":"cucmcdr-zero-means-never-connected","text":"The connect time field holds 0 when the call never connects and the disconnect time field is set even when the call never connects.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-zero-means-never-connected","sources":[{"id":"cisco-cucm-cdr-field-descriptions-15","title":"Call Reporting and Billing Administration Guide for Cisco Unified Communications Manager Release 15 and SUs, CDR Field Descriptions","publisher":"Cisco Systems, Inc. (Webex Help Center)","tier":2,"tierLabel":"current vendor documentation","locator":"CDR Field Descriptions, dateTimeConnect and dateTimeDisconnect","href":"/knowledge/sources/cisco-cucm-cdr-field-descriptions-15"}]}]},{"code":"cause-unspecified-catch-all","topicSlug":"q850-cause-codes","topicTitle":"ITU-T Q.850 call clearing cause values","articleHref":"/knowledge/q850-cause-codes","askHref":"/?topic=q850-cause-codes","claims":[{"id":"q850-each-class-carries-an-unspecified-catch-all","text":"Each Q.850 class carries an unspecified cause used only when no other cause in that class applies, and the definitions say so in the same words for each: 31 normal, 47 resource unavailable, 63 service or option not available, 79 service or option not implemented, 95 invalid message, 111 protocol error and 127 interworking.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/q850-each-class-carries-an-unspecified-catch-all","sources":[{"id":"itu-t-q850-2018","title":"ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part","publisher":"International Telecommunication Union (ITU-T)","tier":1,"tierLabel":"standards and regulators","locator":"clauses 6.2.7.1.25, 6.2.7.2.10, 6.2.7.3.8, 6.2.7.4.5, 6.2.7.6.10 and 6.2.7.7.1","href":"/knowledge/sources/itu-t-q850-2018"}]},{"id":"q850-cause-127-means-no-cause-was-available","text":"Cause 127 interworking unspecified indicates interworking with a network that does not provide causes for its actions, so the precise cause cannot be ascertained.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/q850-cause-127-means-no-cause-was-available","sources":[{"id":"itu-t-q850-2018","title":"ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part","publisher":"International Telecommunication Union (ITU-T)","tier":1,"tierLabel":"standards and regulators","locator":"clause 6.2.7.7.1 Cause No. 127","href":"/knowledge/sources/itu-t-q850-2018"}]},{"id":"q850-cause-number-is-class-times-sixteen-plus-value","text":"A Q.850 cause value is a class in bits 5 to 7 and a value within the class in bits 1 to 4, so the cause number is the class times 16 plus the value, and that arithmetic holds for all 70 cause values in Table 1.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/q850-cause-number-is-class-times-sixteen-plus-value","sources":[{"id":"itu-t-q850-2018","title":"ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part","publisher":"International Telecommunication Union (ITU-T)","tier":1,"tierLabel":"standards and regulators","locator":"clause 6.2.5 Cause value and Table 1","href":"/knowledge/sources/itu-t-q850-2018"}]}]},{"code":"cause-18-or-19","topicSlug":"q850-cause-codes","topicTitle":"ITU-T Q.850 call clearing cause values","articleHref":"/knowledge/q850-cause-codes","askHref":"/?topic=q850-cause-codes","claims":[{"id":"q850-cause-19-differs-from-18-by-alerting","text":"Cause 18 no user responding is used when the called party does not respond to call establishment within the allotted time, while cause 19 no answer from user is used when the called party was alerted and did not answer, so the pair separates a device that never signalled from a device that rang.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/q850-cause-19-differs-from-18-by-alerting","sources":[{"id":"itu-t-q850-2018","title":"ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part","publisher":"International Telecommunication Union (ITU-T)","tier":1,"tierLabel":"standards and regulators","locator":"clauses 6.2.7.1.13 and 6.2.7.1.14","href":"/knowledge/sources/itu-t-q850-2018"}]}]},{"code":"cause-16-from-network","topicSlug":"q850-cause-codes","topicTitle":"ITU-T Q.850 call clearing cause values","articleHref":"/knowledge/q850-cause-codes","askHref":"/?topic=q850-cause-codes","claims":[{"id":"q850-cause-16-from-the-network-is-a-finding","text":"A cause 16 whose location field names a network element is worth stopping on in a trace, because Q.850 says the source of a normal call clearing is not normally the network, and nothing in the record says why the network cleared the call.","status":"inference","verifiedAt":"2026-09-15","href":"/knowledge/claims/q850-cause-16-from-the-network-is-a-finding","sources":[{"id":"itu-t-q850-2018","title":"ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user 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16","href":"/knowledge/sources/itu-t-q850-2018"}]},{"id":"q850-location-is-a-separate-field-with-eight-values","text":"Location is a separate four-bit field of the same cause element with 8 defined values from user through international network and network beyond interworking point, so a cause value quoted without its location does not say who cleared the call.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/q850-location-is-a-separate-field-with-eight-values","sources":[{"id":"itu-t-q850-2018","title":"ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part","publisher":"International Telecommunication Union (ITU-T)","tier":1,"tierLabel":"standards and regulators","locator":"clause 6.2.3 Location","href":"/knowledge/sources/itu-t-q850-2018"}]}]},{"code":"cause-cisco-specific","topicSlug":"cucm-cdr-field-reference","topicTitle":"CUCM CDR and CMR field 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Codes","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]},{"id":"cucmcdr-the-sip-marker-byte-is-not-arithmetic","text":"The high byte of a SIP-derived Unified CM cause code is not a fixed function of the SIP status code: across the 41 distinct status codes in the table the difference between the status code and the marker takes 6 different values, so decoding the SIP status out of a cause code needs the table rather than arithmetic.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-the-sip-marker-byte-is-not-arithmetic","sources":[{"id":"archive-cucm-cdr-admin-guide-1251-book","title":"Call Detail Records Administration Guide for Cisco Unified Communications Manager Release 12.5(1), complete book, Internet Archive capture of 2025-03-23","publisher":"Cisco Systems, Inc., served by the Internet Archive","tier":2,"tierLabel":"current vendor documentation","locator":"Call Detail Records chapter, Table 13 Cisco-Specific Call Termination Cause Codes","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]}]},{"code":"cucm-transfer-final-record","topicSlug":"cucm-cdr-field-reference","topicTitle":"CUCM CDR and CMR field reference","articleHref":"/knowledge/cucm-cdr-field-reference","askHref":"/?topic=cucm-cdr-field-reference","claims":[{"id":"cucmcdr-join-on-behalf-of-marks-the-final-record","text":"The final transferred record is the one whose join-on-behalf-of field is set to 10 meaning transfer, and that field is 0 on the original and consultation records.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-join-on-behalf-of-marks-the-final-record","sources":[{"id":"archive-cucm-cdr-admin-guide-1251-book","title":"Call Detail Records Administration Guide for Cisco Unified Communications Manager Release 12.5(1), complete book, Internet Archive capture of 2025-03-23","publisher":"Cisco Systems, Inc., served by the Internet Archive","tier":2,"tierLabel":"current vendor 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Records chapter, Transferred Calls, the four worked example tables on pages 124 to 126","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]},{"id":"cucmcdr-zero-means-never-connected","text":"The connect time field holds 0 when the call never connects and the disconnect time field is set even when the call never connects.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-zero-means-never-connected","sources":[{"id":"cisco-cucm-cdr-field-descriptions-15","title":"Call Reporting and Billing Administration Guide for Cisco Unified Communications Manager Release 15 and SUs, CDR Field Descriptions","publisher":"Cisco Systems, Inc. (Webex Help Center)","tier":2,"tierLabel":"current vendor documentation","locator":"CDR Field Descriptions, dateTimeConnect and dateTimeDisconnect","href":"/knowledge/sources/cisco-cucm-cdr-field-descriptions-15"}]}]},{"code":"cucm-transfer-split-record","topicSlug":"cucm-cdr-field-reference","topicTitle":"CUCM CDR and CMR field reference","articleHref":"/knowledge/cucm-cdr-field-reference","askHref":"/?topic=cucm-cdr-field-reference","claims":[{"id":"cucmcdr-split-cause-marks-the-first-two-records","text":"On both the original and the consultation record of a transfer, the originating and destination cause values are set to 393216 meaning split and the originating and destination termination-on-behalf-of fields are set to 10 meaning transfer.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-split-cause-marks-the-first-two-records","sources":[{"id":"archive-cucm-cdr-admin-guide-1251-book","title":"Call Detail Records Administration Guide for Cisco Unified Communications Manager Release 12.5(1), complete book, Internet Archive capture of 2025-03-23","publisher":"Cisco Systems, Inc., served by the Internet Archive","tier":2,"tierLabel":"current vendor documentation","locator":"Call Detail Records chapter, Transferred Calls, page 124, and the four worked examples","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]},{"id":"cucmcdr-split-code-393216-replaces-126","text":"The Cisco-specific code 393216, hexadecimal 0x60000, is call split and the table records that it was formerly 126; it is set when a call terminates during a transfer because it was split off and was not part of the final transferred call.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-split-code-393216-replaces-126","sources":[{"id":"archive-cucm-cdr-admin-guide-1251-book","title":"Call Detail Records Administration Guide for Cisco Unified Communications Manager Release 12.5(1), complete book, Internet Archive capture of 2025-03-23","publisher":"Cisco Systems, Inc., served by the Internet Archive","tier":2,"tierLabel":"current vendor documentation","locator":"Call Detail Records chapter, Table 13 Cisco-Specific Call Termination Cause Codes","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]},{"id":"cucmcdr-final-originating-leg-is-the-surviving-original-leg","text":"The final transferred record's originating leg identifier is one of the original record's two leg identifiers, and which of the two it is depends on which party transferred, so a join from the original to the final record has to allow either.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-final-originating-leg-is-the-surviving-original-leg","sources":[{"id":"archive-cucm-cdr-admin-guide-1251-book","title":"Call Detail Records Administration Guide for Cisco Unified Communications Manager Release 12.5(1), complete book, Internet Archive capture of 2025-03-23","publisher":"Cisco Systems, Inc., served by the Internet Archive","tier":2,"tierLabel":"current vendor documentation","locator":"Call Detail Records chapter, Transferred Calls, the four worked example tables on pages 124 to 126","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]}]},{"code":"cucm-consultation-record","topicSlug":"cucm-cdr-field-reference","topicTitle":"CUCM CDR and CMR field reference","articleHref":"/knowledge/cucm-cdr-field-reference","askHref":"/?topic=cucm-cdr-field-reference","claims":[{"id":"cucmcdr-global-call-id-misses-the-consultation-record","text":"Grouping a transfer's records on the global call identifier collects two of the three: in all four worked examples the original and the final transferred record share one global call identifier and the consultation record carries a different one.","status":"field-pattern","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-global-call-id-misses-the-consultation-record","sources":[{"id":"archive-cucm-cdr-admin-guide-1251-book","title":"Call Detail Records Administration Guide for Cisco Unified Communications Manager Release 12.5(1), complete book, Internet Archive capture of 2025-03-23","publisher":"Cisco Systems, Inc., served by the Internet Archive","tier":2,"tierLabel":"current vendor documentation","locator":"Call Detail Records chapter, Transferred Calls, the four worked example tables on pages 124 to 126","href":"/knowledge/sources/archive-cucm-cdr-admin-guide-1251-book"}]},{"id":"cucmcdr-duration-is-zero-below-one-second","text":"The duration field is zero both when a call never connects and when it connects for less than one second, so a duration of zero is not evidence that a call was never answered.","status":"fact","verifiedAt":"2026-09-15","href":"/knowledge/claims/cucmcdr-duration-is-zero-below-one-second","sources":[{"id":"cisco-cucm-cdr-field-descriptions-15","title":"Call Reporting and Billing Administration Guide for Cisco Unified Communications Manager Release 15 and SUs, CDR Field Descriptions","publisher":"Cisco Systems, Inc. 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Transfer","publisher":"IETF / RFC Editor","tier":1,"tierLabel":"standards and regulators","locator":"RFC 5589 section 7.3, paragraph 3","href":"/knowledge/sources/rfc-5589-call-control-transfer"}]}]},{"code":"sip-replaces-unobserved-dialog","topicSlug":"call-transfer-semantics","topicTitle":"Call transfer semantics REFER and Replaces","articleHref":"/knowledge/call-transfer-semantics","askHref":"/?topic=call-transfer-semantics","claims":[{"id":"xfersem-replaces-matches-on-three-values","text":"The Replaces header field identifies an existing dialog by Call-ID, to-tag and from-tag, and a user agent server matches those parameters as if they were tags in an incoming request, comparing the to-tag parameter to its own local tag and the from-tag parameter to the remote tag.","status":"fact","verifiedAt":"2026-09-16","href":"/knowledge/claims/xfersem-replaces-matches-on-three-values","sources":[{"id":"rfc-3891-replaces","title":"RFC 3891 — The Session Initiation Protocol (SIP) \"Replaces\" Header","publisher":"IETF / RFC Editor","tier":1,"tierLabel":"standards and regulators","locator":"RFC 3891 section 3, first 2 paragraphs","href":"/knowledge/sources/rfc-3891-replaces"}]},{"id":"xfersem-replaces-481-cases","text":"A Replaces header field that matches no dialog, that matches more than one dialog, or that matches a dialog not created with an INVITE is answered with 481 Call/Transaction Does Not Exist, and in the multiple-match case the user agent must act as if no match was found.","status":"fact","verifiedAt":"2026-09-16","href":"/knowledge/claims/xfersem-replaces-481-cases","sources":[{"id":"rfc-3891-replaces","title":"RFC 3891 — The Session Initiation Protocol (SIP) \"Replaces\" Header","publisher":"IETF / RFC Editor","tier":1,"tierLabel":"standards and regulators","locator":"RFC 3891 section 3, paragraphs 5 and 6","href":"/knowledge/sources/rfc-3891-replaces"}]},{"id":"xfersem-replaces-early-only-gets-486","text":"The early-only parameter in a Replaces header field restricts the replacement to an early dialog, and where it is present and the header matches a confirmed dialog the user agent rejects the request with a 486 Busy response.","status":"fact","verifiedAt":"2026-09-16","href":"/knowledge/claims/xfersem-replaces-early-only-gets-486","sources":[{"id":"rfc-3891-replaces","title":"RFC 3891 — The Session Initiation Protocol (SIP) \"Replaces\" Header","publisher":"IETF / RFC Editor","tier":1,"tierLabel":"standards and regulators","locator":"RFC 3891 sections 3 and 4, early-only","href":"/knowledge/sources/rfc-3891-replaces"}]}]},{"code":"calling-consultative-transfer","topicSlug":"webex-calling-cdr-reference","topicTitle":"What the Webex Calling detailed call history records","articleHref":"/knowledge/webex-calling-cdr-reference","askHref":"/?topic=webex-calling-cdr-reference","claims":[{"id":"wxcdr-blind-transfer-surfaces-as-deflection","text":"A consultative transfer is carried in the related reason field by its own value, and a blind transfer surfaces only as deflection, a value it shares with auto-attendant transfer and call centre exit.","status":"fact","verifiedAt":"2026-09-05","href":"/knowledge/claims/wxcdr-blind-transfer-surfaces-as-deflection","sources":[{"id":"cisco-help-nmug598-cloud-collaboration-reports","title":"Reports for Your Cloud Collaboration Portfolio","publisher":"Cisco Systems, Inc. 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