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<div>Hi asterisk-users,</div>
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<div>We have recently moved to the 13.x branch of Asterisk from 11.x, and we're trying to correlate CDR records from multiple-legs for billing purposes.</div>
<div>As part of this change we have added 'linkedid' to our CDR table schema in an attempt to join the multiple records into one billable record.</div>
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<div>The call path can be simplified as (transport types in brackets):</div>
<div>SIP Phone---(SIP)---Asterisk Svr1---(IAX)---Asterisk Svr2---(IAX)---Asterisk Svr3---(SIP)---PSTN</div>
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<div>As per the CDR spec, I expected the 'linkedid' to propagate between the records and be the same throughout...</div>
<div>However, we observe differing linkedid values for the same call... Thus (xxx's added for privacy):</div>
<div>| id | calldate | src | dst | accountcode | uniqueid | linkedid | billsec | duration |</div>
<div>| 5031920 | 2018-10-03 01:51:41 | 0362xxxxxx | 0449xxxxxx | | 1538531501.18974 | 1538531501.18974 | 64 | 71 |</div>
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<div>| 5031921 | 2018-10-03 01:52:52 | 6613 | 0449xxxxxx | 759553 | 1538531488.11368 | 1538531488.11368 | 0 | 0 |</div>
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<div>Noting that our out-dial from Svr2 changes the CLID to 0362xxxxxx as we must present that CLID to our PSTN upstream provider as per their requirements.
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<div>The first record is taken from Asterisk Svr2, the second from Asterisk Svr1 (Svr1 replicates MySQL to Svr2)</div>
<div>As you can see, the linkedid records are different (1538531501.18974 vs 1538531488.11368)</div>
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<div>The difference appears to be the matter of microsecs that it takes to connect the call legs (over a satellite connection) so I could probably 'guess' that these two are the same call, however for billing purposes this is not accurate enough.</div>
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<div>Can someone shed some light on why the linkedid is not being shared between IAX channels?</div>
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<div>Cheers,</div>
<div>Calum</div>
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